MIL-HDBK-5: Chapter 2.6 — Precipitation and Transformation Hardening Steel
Chapter 2.6 Contents
2.6Precipitation & Transformation Hardening Steel 2.6.0Comments 2.6.0.1Metallurgical Considerations 2.6.0.2Manufacturing Considerations 2.6.0.3Environmental Considerations 2.6.1AM-350 2.6.1.0Material Specifications and Design Properties 2.6.1.1SCT 850 Condition 2.6.2AM-355 2.6.2.0Material Specifications and Design Properties 2.6.2.1SCT Condition 2.6.3Custom 450 2.6.3.0Material Specifications and Design Properties 2.6.3.1H900 Condition 2.6.3.2H1050 Condition 2.6.4Custom 455 2.6.4.0Material Specifications and Design Properties 2.6.4.1H950 Condition 2.6.4.2H1000 Condition 2.6.5Custom 465 2.6.5.0Material Specifications and Design Properties 2.6.5.1H950 and H1000 Conditions 2.6.6PH13-8Mo 2.6.6.0Material Specifications and Design Properties 2.6.6.1H950 and H1000 Conditions 2.6.715-5PH 2.6.7.0Material Specifications and Design Properties 2.6.7.1General Design Properties 2.6.7.2H1025 Condition 2.6.7.3H1150 Condition 2.6.8PH15-7Mo 2.6.8.0Material Specifications and Design Properties 2.6.8.1TH1050 Condition 2.6.917-4PH 2.6.9.0Material Specifications and Design Properties 2.6.9.1H900 Condition 2.6.9.2General Temperature Properties 2.6.9.3H1000 Condition 2.6.9.4H1025 Condition 2.6.9.5H1100 Condition 2.6.9.6H1150 Condition 2.6.1017-7PH 2.6.10.0Material Specifications and Design Properties 2.6.10.1TH1050 Condition
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Chapter 1 Chapter 2 Index 2.1 — General 2.2 — Carbon Steels 2.3 — Low-Alloy Steels 2.4 — Intermediate Alloy Steels 2.5 — High Alloy Steels 2.6 — PH & Transformation Hardening 2.7 — Austenitic Stainless Steels Chapter 3
Disclaimer

For reference use only. The formulas, graphs, and values herein are provided in good faith for general engineering guidance. Please verify all data against MIL-HDBK-5J or the applicable superseding document (MMPDS).

Figures and Tables
Table of Tables
Table 2.6.1.0(a)Effect of Sustained-Load Exposure on Room-Temperature Tensile Properties of AM-350 (SCT 850) Table 2.6.1.0(b)Material Specifications for AM-350 Table 2.6.1.0(c)Design Mechanical and Physical Properties for AM-350 Table 2.6.2.0(a)Effect of Sustained-Load Exposure on Room-Temperature Tensile Properties of AM-355 (SCT) Table 2.6.2.0(b)Material Specifications for AM-355 Table 2.6.2.0(c)Design Mechanical and Physical Properties for AM-355 Table 2.6.2.0(d)Design Mechanical and Physical Properties for AM-355 Plate (AMS 5549) Table 2.6.2.0(e)Elongation (LT) of AM-355 Sheet by Thickness Table 2.6.3.0(a)Material Specifications for Custom 450 Table 2.6.3.0(b)Design Mechanical and Physical Properties for Custom 450 Bar (AMS 5763) Table 2.6.3.0(c)Design Mechanical and Physical Properties for Custom 450 Bar (AMS 5773) Table 2.6.4.0(a)Material Specifications for Custom 455 Table 2.6.4.0(b)Design Mechanical and Physical Properties for Custom 455 Table 2.6.5.0(a)Stress-Corrosion Results for Custom 465 Bar Table 2.6.5.0(b)Tensile Properties of Custom 465 Alloy After Thermal Exposure Table 2.6.5.0(c)Material Specifications for Custom 465 Table 2.6.5.0(d)Design Mechanical and Physical Properties for Custom 465 Table 2.6.6.0(a)Material Specifications for PH13-8Mo Stainless Steel Table 2.6.6.0(b)Design Mechanical and Physical Properties for PH13-8Mo Table 2.6.6.0(c)Design Mechanical and Physical Properties for PH13-8Mo Forgings Table 2.6.7.0(a)Material Specifications for 15-5PH Table 2.6.7.0(b)Design Mechanical and Physical Properties for 15-5PH Bar Table 2.6.7.0(c)Design Mechanical and Physical Properties for 15-5PH Plate (H1025) Table 2.6.7.0(d)Design Mechanical and Physical Properties for 15-5PH Investment Casting (H935) Table 2.6.8.0(a)Material Specifications for PH15-7Mo Table 2.6.8.0(b)Design Mechanical and Physical Properties for PH15-7Mo (TH1050) Table 2.6.8.0(c)Additional Design Properties for PH15-7Mo Table 2.6.9.0(a)Material Specifications for 17-4PH Table 2.6.9.0(b)Design Mechanical and Physical Properties for 17-4PH Sheet, Strip, and Plate Table 2.6.9.0(c)Elongation for 17-4PH Sheet, Strip, and Plate by Thickness and Condition Table 2.6.9.0(d)Design Mechanical and Physical Properties for 17-4PH Forgings Table 2.6.9.0(e)Design Mechanical and Physical Properties for 17-4PH Bar Table 2.6.9.0(f)Design Mechanical and Physical Properties for 17-4PH Investment Castings Table 2.6.10.0(a)Material Specifications for 17-7PH Table 2.6.10.0(b)Design Mechanical and Physical Properties for 17-7PH (TH1050) Table 2.6.10.0(c)Elongation for 17-7PH Sheet (TH1050) by Thickness
Table of Figures
Fig 2.6.1.0Effect of temperature on physical properties of AM-350 stainless steel Fig 2.6.1.1.1Effect of temperature on Ftu and Fty for AM-350 (SCT 850) Fig 2.6.1.1.2Effect of temperature on Fcy for AM-350 (SCT 850) Fig 2.6.1.1.3Effect of temperature on Fsu for AM-350 (SCT 850) Fig 2.6.1.1.4Effect of temperature on Fbru for AM-350 (SCT 850) Fig 2.6.1.1.6(a)Typical stress-strain and tangent-modulus curves for AM-350 (SCT 850), longitudinal Fig 2.6.1.1.6(b)Typical stress-strain and tangent-modulus curves for AM-350 (SCT 850), transverse Fig 2.6.2.0Effect of temperature on physical properties of AM-355 stainless steel Fig 2.6.2.1.1Effect of temperature on Ftu and Fty for AM-355 (SCT) Fig 2.6.2.1.2Effect of temperature on Fcy for AM-355 (SCT) Fig 2.6.2.1.3Effect of temperature on Fsu for AM-355 (SCT) Fig 2.6.2.1.4Effect of temperature on Fbru for AM-355 (SCT) Fig 2.6.3.0Effect of temperature on physical properties of Custom 450 stainless steel Fig 2.6.3.1.1Effect of temperature on Ftu and Fty for Custom 450 (H900) Fig 2.6.3.1.2Effect of temperature on Fcy for Custom 450 (H900) Fig 2.6.3.1.5Effect of temperature on E, Ec, and G for Custom 450 (H900) Fig 2.6.3.1.6Typical stress-strain and tangent-modulus curves for Custom 450 (H900) Fig 2.6.3.1.8Typical S/N curves for Custom 450 (H900) Fig 2.6.3.2.1Effect of temperature on Ftu and Fty for Custom 450 (H1050) Fig 2.6.3.2.2Effect of temperature on Fsu for Custom 450 (H1050) Fig 2.6.3.2.5Effect of temperature on elongation (e) and reduction of area (RA) for Custom 450 (H1050) Fig 2.6.3.2.6Typical tensile stress-strain curve for Custom 450 (H1050) at room temperature Fig 2.6.3.2.8Typical S/N curves for Custom 450 (H1050) Fig 2.6.4.0Effect of temperature on physical properties of Custom 455 stainless steel Fig 2.6.4.1.1Effect of temperature on Ftu and Fty for Custom 455 (H950) Fig 2.6.4.1.2Effect of temperature on Fsu for Custom 455 (H950) Fig 2.6.4.1.5Effect of temperature on elongation (e) and reduction of area (RA) for Custom 455 (H950) Fig 2.6.4.1.6Typical tensile stress-strain curve for Custom 455 (H950) at room temperature Fig 2.6.4.1.8(a)Typical S/N curves for Custom 455 (H950), unnotched Fig 2.6.4.1.8(b)Typical S/N curves for Custom 455 (H950), notched Fig 2.6.4.2.1Effect of temperature on Ftu and Fty for Custom 455 (H1000) Fig 2.6.4.2.2Effect of temperature on Fsu for Custom 455 (H1000) Fig 2.6.4.2.5Effect of temperature on elongation (e) and reduction of area (RA) for Custom 455 (H1000) Fig 2.6.4.2.6Typical tensile stress-strain curve for Custom 455 (H1000) at room temperature Fig 2.6.4.2.8Typical S/N curves for Custom 455 (H1000) Fig 2.6.5.0(a)Effect of temperature on physical properties of Custom 465 stainless steel Fig 2.6.5.1(a)Typical tensile stress-strain curves for Custom 465 (H950 and H1000) at room temperature Fig 2.6.5.1(b)Typical tensile stress-strain curves (full range) for Custom 465 H950 bar at room temperature Fig 2.6.5.1(c)Typical tensile stress-strain curves (full range) for Custom 465 H1000 bar at room temperature Fig 2.6.6.0Effect of temperature on physical properties of PH13-8Mo stainless steel Fig 2.6.6.1.1Effect of temperature on Ftu and Fty for PH13-8Mo (H950 and H1000) Fig 2.6.6.1.6(a)Typical tensile stress-strain curve for PH13-8Mo (H1000) at room temperature Fig 2.6.6.1.6(b)Typical compressive stress-strain and tangent modulus curves for PH13-8Mo (H1000) at room temperature Fig 2.6.6.1.6(c)Typical tensile stress-strain curves (full range) for various heat treated conditions of PH13-8Mo Fig 2.6.6.1.8(a)Best-fit S/N curves for unnotched PH13-8Mo (H1000) forged bar, longitudinal and transverse Fig 2.6.6.1.8(b)Best-fit S/N curves for notched, Kt = 3.0, PH13-8Mo (H1000) forged bar Fig 2.6.6.1.8(c)Best-fit S/N curves for unnotched PH13-8Mo (H1000) hand forging, longitudinal Fig 2.6.7.0Effect of temperature on physical properties of 15-5PH stainless steel Fig 2.6.7.1.1Effect of temperature on Ftu and Fty for 15-5PH (multiple conditions) Fig 2.6.7.1.4Effect of temperature on Fbru for 15-5PH Fig 2.6.7.1.6(a)Typical stress-strain and tangent-modulus curves for 15-5PH (H900) Fig 2.6.7.1.6(b)Typical stress-strain and tangent-modulus curves for 15-5PH (H1025) Fig 2.6.7.1.6(c)Typical stress-strain and tangent-modulus curves for 15-5PH (H1150) Fig 2.6.7.2.2Effect of temperature on Fcy for 15-5PH (H1025) Fig 2.6.7.2.6(a)Typical stress-strain and tangent-modulus curves for 15-5PH (H1025), longitudinal Fig 2.6.7.2.6(b)Typical stress-strain and tangent-modulus curves for 15-5PH (H1025), transverse Fig 2.6.7.2.8(a)Typical S/N curves for 15-5PH (H1025), unnotched Fig 2.6.7.2.8(b)Typical S/N curves for 15-5PH (H1025), notched Fig 2.6.7.2.8(c)Typical S/N curves for 15-5PH (H1025), additional data Fig 2.6.7.3.2Effect of temperature on Fcy for 15-5PH (H1150) Fig 2.6.7.3.6Typical stress-strain and tangent-modulus curves for 15-5PH (H1150) Fig 2.6.8.0Effect of temperature on physical properties of PH15-7Mo stainless steel Fig 2.6.8.1.1Effect of temperature on Ftu and Fty for PH15-7Mo (TH1050) Fig 2.6.8.1.4Effect of temperature on Fbru for PH15-7Mo (TH1050) Fig 2.6.8.1.6(a)Typical stress-strain and tangent-modulus curves for PH15-7Mo (TH1050), longitudinal Fig 2.6.8.1.6(b)Typical stress-strain and tangent-modulus curves for PH15-7Mo (TH1050), transverse Fig 2.6.8.1.6(c)Typical stress-strain and tangent-modulus curves for PH15-7Mo (TH1050), short-transverse Fig 2.6.8.1.8(a)Typical S/N curves for PH15-7Mo (TH1050), unnotched sheet Fig 2.6.8.1.8(b)Typical S/N curves for PH15-7Mo (TH1050), notched sheet Fig 2.6.8.1.8(c)Typical S/N curves for PH15-7Mo (TH1050), bar Fig 2.6.8.1.8(d)Typical S/N curves for PH15-7Mo (TH1050), additional data (1) Fig 2.6.8.1.8(e)Typical S/N curves for PH15-7Mo (TH1050), additional data (2) Fig 2.6.8.1.8(f)Typical S/N curves for PH15-7Mo (TH1050), additional data (3) Fig 2.6.9.0Effect of temperature on physical properties of 17-4PH stainless steel Fig 2.6.9.1.2Effect of temperature on Fcy for 17-4PH (H900) Fig 2.6.9.1.3Effect of temperature on Fsu for 17-4PH (H900) Fig 2.6.9.1.4Effect of temperature on Fbru for 17-4PH (H900) Fig 2.6.9.1.8(a)Typical S/N curves for 17-4PH (H900), unnotched Fig 2.6.9.1.8(b)Typical S/N curves for 17-4PH (H900), notched Fig 2.6.9.1.8(c)Typical S/N curves for 17-4PH (H900), additional data Fig 2.6.9.2.1Effect of temperature on Ftu and Fty for 17-4PH (multiple conditions) Fig 2.6.9.2.6(a)Typical stress-strain and tangent-modulus curves for 17-4PH (H900) Fig 2.6.9.2.6(b)Typical stress-strain and tangent-modulus curves for 17-4PH (multiple conditions) Fig 2.6.9.3.6(a)Typical stress-strain and tangent-modulus curves for 17-4PH (H1000), longitudinal Fig 2.6.9.3.6(b)Typical stress-strain and tangent-modulus curves for 17-4PH (H1000), transverse Fig 2.6.9.4.8Typical S/N curves for 17-4PH (H1025) Fig 2.6.9.5.8Typical S/N curves for 17-4PH (H1100) Fig 2.6.9.6.1Effect of temperature on Ftu and Fty for 17-4PH (H1150) Fig 2.6.10.0Effect of temperature on physical properties of 17-7PH stainless steel Fig 2.6.10.1.1Effect of temperature on Ftu and Fty for 17-7PH (TH1050) Fig 2.6.10.1.2Effect of temperature on Fcy for 17-7PH (TH1050) Fig 2.6.10.1.4(a)Effect of temperature on Fbru for 17-7PH (TH1050), e/D = 1.5 Fig 2.6.10.1.4(b)Effect of temperature on Fbru for 17-7PH (TH1050), e/D = 2.0 Fig 2.6.10.1.6(a)Typical stress-strain and tangent-modulus curves for 17-7PH (TH1050), longitudinal Fig 2.6.10.1.6(b)Typical stress-strain and tangent-modulus curves for 17-7PH (TH1050), transverse Fig 2.6.10.1.6(c)Typical stress-strain and tangent-modulus curves for 17-7PH (TH1050), short-transverse
2.6Precipitation and Transformation Hardening Steel (Stainless)
2.6.0Comments on Precipitation and Transformation Hardening Steels

The precipitation and transformation hardening steels in this section include both austenitic and martensitic stainless steels that are hardened by precipitation or transformation mechanisms. These steels combine corrosion resistance with high strength and are widely used in aerospace structural applications.

2.6.0.1Metallurgical Considerations

The precipitation hardening stainless steels achieve their high strength through precipitation of intermetallic compounds during aging treatments. The martensitic grades (e.g., 17-4PH, 15-5PH, Custom 450, Custom 455, Custom 465, PH13-8Mo) are supplied in the annealed or solution-treated condition and strengthened by a single aging treatment. The semi-austenitic grades (e.g., AM-350, AM-355, PH15-7Mo, 17-7PH) require a conditioning treatment to transform the austenite to martensite before aging.

The high chromium content (typically 12 -“18%) provides corrosion resistance. The nickel content stabilizes the austenite in the semi-austenitic grades, while molybdenum, copper, aluminum, and titanium additions are used to provide precipitation hardening response.

2.6.0.2Manufacturing Considerations

Heat Treatment: Heat treating procedures for these steels are specified in MIL-H-6875. The designations used in the property tables (e.g., H900, H950, H1000, H1025, H1050, H1100, H1150 for the martensitic grades; TH1050, RH950, SCT 850 for the semi-austenitic grades) refer to specific heat treatment conditions defined in that document. The number in the designation generally corresponds to the aging temperature in degrees Fahrenheit.

Machining and Forming: The martensitic PH grades are best machined and formed in the annealed or solution-treated condition prior to the final aging treatment. The semi-austenitic grades in the austenitic condition have forming characteristics similar to austenitic stainless steels.

2.6.0.3Environmental Considerations

The precipitation hardening stainless steels are susceptible to stress corrosion cracking (SCC) particularly at the higher strength levels (lower aging temperatures). The martensitic grades heat treated to H900 condition are most susceptible. As the aging temperature is increased (H950, H1000, etc.), SCC resistance improves at the expense of strength. Protective coatings and design practices to minimize sustained tensile stresses in corrosive environments are recommended for the higher-strength conditions.

2.6.1AM-350

AM-350 is a semi-austenitic precipitation hardening stainless steel with nominally 16.5% chromium, 4.5% nickel, and 2.75% molybdenum. It is available in sheet, strip, plate, bar, and forging forms.

2.6.1.0Material Specifications and Design Properties
Table 2.6.1.0(a). Effect of Sustained-Load Exposure on Room-Temperature Tensile Properties of AM-350 (SCT 850)
Exposure temperature, °F Exposure stress, ksi Exposure time, hr Room-temperature properties
TUS, ksi TYS, ksi e, %
RT……20115812.0
600601,00019816214.0
700601,00020416911.0
800601,0002201907.0
600901,00020217713.0
700901,00020618011.0
800901,0002141927.0
Table 2.6.1.0(b). Material Specifications for AM-350
Specification Form
AMS 5548Sheet and strip
Table 2.6.1.0(c). Design Mechanical and Physical Properties for AM-350
Specification AMS 5548
Form Sheet and stripa
Condition SCT 850
Thickness, in. ≤0.187
Basis S
Mechanical Properties:
Ftu, ksi:
L183
LT185
Fty, ksi:
L147
LT150
Fcy, ksi:
L163
LT…
Fsu, ksi121
Fbru, ksi:
(e/D = 1.5)…
(e/D = 2.0)373
Fbry, ksi:
(e/D = 1.5)…
(e/D = 2.0)252
e, percent:
LT10b
E, 103 ksi29.0
Ec, 103 ksi30.0
G, 103 ksi11.0
μ0.32
Physical Properties:
ω, lb/in.30.282
C, Btu/(lb)(°F)0.12 (32 to 212°F)
K and αSee Figure 2.6.1.0
a  Test direction longitudinal for widths less than 9 in.; transverse for widths 9 in. and over.
b  Elongation is 8 percent for sheet thickness in the range 0.010 to 0.050 inch. Listed value is for thickness > 0.050 inch.

Figure 2.6.1.0. Effect of temperature on the physical properties of AM-350 stainless steel.

α — Between 70°F and indicated temperature.   K — At indicated temperature.

2.6.1.1SCT 850 Condition

Figure 2.6.1.1.1. Effect of temperature on the tensile ultimate strength (Ftu), the tensile yield strength (Fty), and the compressive yield strength (Fcy) of AM-350 (SCT 850) stainless steel sheet.

Figure 2.6.1.1.2. Effect of temperature on the shear ultimate strength (Fsu) of AM-350 (SCT 850) stainless steel sheet.

Figure 2.6.1.1.3. Effect of temperature on the bearing ultimate strength (Fbru) and the bearing yield strength (Fbry) of AM-350 (SCT 850) stainless steel sheet.

Figure 2.6.1.1.4. Effect of temperature on the tensile and compressive moduli (E and Ec) of AM-350 (SCT 850) stainless steel sheet.

Figure 2.6.1.1.6(a). Typical tensile stress-strain curves at various temperatures for AM-350 (SCT 850) stainless steel sheet.

Compressive Stress-Strain

Compressive Tangent Modulus

Figure 2.6.1.1.6(b). Typical compressive stress-strain and compressive tangent-modulus curves at various temperatures for AM-350 (SCT 850) stainless steel sheet.

2.6.2AM-355

AM-355 is a semi-austenitic precipitation hardening stainless steel with nominally 15.5% chromium, 4.5% nickel, 2.75% molybdenum, and 0.13% carbon. It is available in sheet, strip, plate, bar, and forging forms.

2.6.2.0Material Specifications and Design Properties
Table 2.6.2.0(a). Effect of Sustained-Load Exposure on Room-Temperature Tensile Properties of AM-355 (SCT)
Exposure temperature, °F Exposure stress, ksi Exposure time, hr Room-temperature properties
TUS, ksi TYS, ksi e, %
RT……21117011.5
600661,00021317212.0
700651,00021817810.5
800621,00022720012.5
600991,00021418010.5
700971,00021818911.5
800931,00022420412.5
Table 2.6.2.0(b). Material Specifications for AM-355
Specification Form
AMS 5547Sheet and strip
AMS 5549aPlate
AMS 5743Bar, forging, and forging stock
a  Noncurrent specification.
Table 2.6.2.0(c). Design Mechanical and Physical Properties for AM-355
Specification AMS 5547 AMS 5743
Form Sheet and stripa Bar and forging
Condition SCT850b SCT1000 SCT850b SCT1000
Thickness or diameter, in. 0.0005–0.187 0.010–0.187 … …
Basis S S S S
Mechanical Properties:
Ftu, ksi:
L188…200170
LT190165……
Fty, ksi:
L162…165155
LT165140……
Fcy, ksi:
L180………
LT…………
Fsu, ksi124………
Fbru, ksi:
(e/D = 1.5)…………
(e/D = 2.0)383………
Fbry, ksi:
(e/D = 1.5)…………
(e/D = 2.0)278………
e, percent:
L…c…1012
LT…10……
RA, percent:
L……2025
E, 103 ksi29.0
Ec, 103 ksi29.0
G, 103 ksi11.0
μ0.32
Physical Properties:
ω, lb/in.30.282
C, K, and αSee Figure 2.6.2.0
a  Test direction longitudinal for widths less than 9 inches; transverse for widths 9 inches and over.
b  Note: Condition SCT850 has been superseded by Condition SCT1000 in the applicable specifications. The tensile properties in these columns are the values previously specified for Condition SCT850.
c  See Table 2.6.2.0(e).
Table 2.6.2.0(d). Design Mechanical and Physical Properties for AM-355 Plate (AMS 5549)
Specification AMS 5549a
Form Plateb
Condition SCT850c SCT 1000
Thickness, in. <0.375 0.375–1.000 >1.000 <0.187
Basis S S S S
Mechanical Properties:
Ftu, ksi:
L188………
LT190190190165
Fty, ksi:
L162……d…
LT165150…140
Fcy, ksi:
L180………
LT…………
Fsu, ksi124………
Fbru, ksi:
(e/D = 1.5)…………
(e/D = 2.0)383………
Fbry, ksi:
(e/D = 1.5)…………
(e/D = 2.0)278………
e, percent:
LT10101012
E, 103 ksi29.0
Ec, 103 ksi29.0
G, 103 ksi11.0
μ0.32
Physical Properties:
ω, lb/in.30.282
C, K, and αSee Figure 2.6.2.0
a  Noncurrent specification.
b  Test direction longitudinal for widths less than 9 inches; transverse for widths 9 inches and over.
c  Note: Condition SCT850 has been superseded by Condition SCT1000 in the applicable specifications. The tensile properties in these columns are the values previously specified for Condition SCT850.
d  As agreed upon by purchaser and vendor.
Table 2.6.2.0(e). Elongation (LT) of AM-355 Sheet by Thickness
Thickness, inches e (LT), percent in 2 inches
0.0005 to 0.00152
Over 0.0015 to 0.00203
Over 0.0020 to 0.00505
Over 0.0050 to 0.01007
Over 0.0100 to 0.18758

Figure 2.6.2.0. Effect of temperature on the physical properties of AM-355 stainless steel.

α — Between 70°F and indicated temperature.   K — At indicated temperature.

2.6.2.1SCT Condition

Figure 2.6.2.1.1. Effect of temperature on the tensile ultimate strength (Ftu), the tensile yield strength (Fty), and the compressive yield strength (Fcy) of AM-355 (SCT 850) stainless steel (all products).

Figure 2.6.2.1.2. Effect of temperature on the shear ultimate strength (Fsu) of AM-355 (SCT 850) stainless steel (all products).

Figure 2.6.2.1.3. Effect of temperature on the bearing ultimate strength (Fbru) and the bearing yield strength (Fbry) of AM-355 (SCT 850) stainless steel sheet.

Figure 2.6.2.1.4. Effect of temperature on the tensile modulus (E) of AM-355 (SCT 850) stainless steel (all products).

2.6.3Custom 450

Custom 450 is a martensitic precipitation hardening stainless steel with nominally 15.5% chromium, 6.0% nickel, 0.75% molybdenum, and 1.5% copper. It is solution treated and aged to achieve the desired strength level.

2.6.3.0Material Specifications and Design Properties
Table 2.6.3.0(a). Material Specifications for Custom 450
Specification Form
AMS 5763Bar, forging, tubing, wire, and ring (air melted)
AMS 5773Bar, forging, tubing, wire, and ring (CEM)
Table 2.6.3.0(b). Design Mechanical and Physical Properties for Custom 450 Bar (AMS 5763)
Specification AMS 5763
Form Bar
Condition Solution Treated H900 H1050
Thickness or diameter, in. ≤8.000 ≤8.000 ≤8.000
Basis S S Sa
Mechanical Properties:
Ftu, ksi:
L125180145
ST…179144
Fty, ksi:
L95170135
ST…168133
Fcy, ksi:
L…175143
ST…173141
Fsu, ksi…11493
Fbru, ksi:
(e/D = 1.5)…298239
(e/D = 2.0)…381307
Fbry, ksi:
(e/D = 1.5)…265204
(e/D = 2.0)…326257
e, percent:
L101012
RA, percent:
L404045
E, 103 ksi28.029.0
Ec, 103 ksi…31.0
G, 103 ksi…11.2
μ…0.29
Physical Properties:
ω, lb/in.30.28
C, Btu/(lb)(°F)…
K, Btu/[(hr)(ft2)(°F)/ft]…
α, 10−6 in./in./°FSee Figure 2.6.3.0
a  Suppliers guaranteed minimum properties.
Table 2.6.3.0(c). Design Mechanical and Physical Properties for Custom 450 Bar (AMS 5773)
Specification AMS 5773
Form Bar
Condition Solution treated H900 H950 H1000 H1050 H1100 H1150
Thickness or diameter, in. ≤12.000
Basis S S S S S S S
Mechanical Properties:
Ftu, ksi:
L125180170160145130125
T…180170160145130125
Fty, ksi:
L9517016015013510575
T…17016015013510575
Fcy, ksi:
L…175……143……
T…173……141……
Fsu, ksi…114……93……
Fbru, ksi:
(e/D = 1.5)…298……239……
(e/D = 2.0)…381……307……
Fbry, ksi:
(e/D = 1.5)…265……204……
(e/D = 2.0)…326……257……
e, percent:
L10101012121618
T…67891112
R, percent:
L40404045455055
T…202227303035
E, 103 ksi28.029.0
Ec, 103 ksi…31.0
G, 103 ksi…11.2
μ…0.29
Physical Properties:
ω, lb/in.30.28
C, Btu/(lb)(°F)…
K, Btu/[(hr)(ft2)(°F)/ft]…
α, 10−6 in./in./°FSee Figure 2.6.3.0

Figure 2.6.3.0. Effect of temperature on the physical properties of Custom 450 stainless steel.

α — Between 70°F and indicated temperature.

2.6.3.1H900 Condition

Figure 2.6.3.1.1. Effect of temperature on the tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of Custom 450 (H900) stainless steel bar.

Figure 2.6.3.1.2. Effect of temperature on the ultimate shear strength (Fsu) of Custom 450 (H900) stainless steel bar.

Figure 2.6.3.1.5. Effect of temperature on the elongation (e) and the reduction of area (RA) of Custom 450 (H900) stainless steel bar.

Figure 2.6.3.1.6. Typical tensile stress-strain curve for Custom 450 (H900) stainless steel bar at room temperature.

Figure 2.6.3.1.8. Best-fit S/N curves for notched, Kt = 3.0, Custom 450 (H900) stainless steel (ESR) bar, longitudinal direction.

R = 0.1  |  Longitudinal direction  |  ESR bar

Correlative Information for Figure 2.6.3.1.8

Product Form: Bar, 1.0625 inch diameter

Properties:

TUS, ksi TYS, ksi Temp., °F
192 188 RT (unnotched)
304 — RT (notched)

Specimen Details: Notched, V-Groove, Kt=3.0
0.283 inch gross diameter
0.200 inch net diameter
0.010 inch root radius, r
60° flank angle, ω

Surface Condition: Polished with abrasive nylon cord

Reference:   2.6.3.1.8

Test Parameters:
Loading - Axial
Frequency - 1800 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: 1

Equivalent Stress Equation:
Log Nf = 9.64−3.21 log (Seq−39.28)
Seq = Smax (1−R)0.65
Std. Error of Estimate, Log (Life) = 0.228
Standard Deviation, Log (Life) = 0.656
R2 = 88%

Sample Size = 19

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]
2.6.3.2H1050 Condition

Figure 2.6.3.2.1. Effect of temperature on the tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of Custom 450 (H1050) stainless steel bar.

Figure 2.6.3.2.2. Effect of temperature on the ultimate shear strength (Fsu) of Custom 450 (H1050) stainless steel bar.

RA — Reduction of Area

e — Elongation

Figure 2.6.3.2.5. Effect of temperature on the elongation (e) and the reduction of area (RA) of Custom 450 (H1050) stainless steel bar.

Figure 2.6.3.2.6. Typical tensile stress-strain curve for Custom 450 (H1050) stainless steel bar at room temperature.

Figure 2.6.3.2.8. Best-fit S/N curves for notched, Kt = 3.0, Custom 450 (H1050) stainless steel (ESR) bar, longitudinal direction.

Kt = 3.0  |  Longitudinal direction  |  ESR bar

Correlative Information for Figure 2.6.3.2.8

Product Form: Bar, 1.0625 inch diameter

Properties:

TUS, ksi TYS, ksi Temp., °F
156 151 RT (unnotched)
244 — RT (notched)

Specimen Details: Notched, V-Groove, Kt=3.0
0.283 inch gross diameter
0.200 inch net diameter
0.010 inch root radius, r
60° flank angle, ω

Surface Condition: Polished with abrasive nylon cord

Reference:   2.6.3.1.8

Test Parameters:
Loading - Axial
Frequency - 1800 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: 1

Equivalent Stress Equation:
Log Nf = 9.59−3.15 log (Seq−33.23)
Seq = Smax (1−R)0.607
Std. Error of Estimate, Log (Life) = 0.188
Standard Deviation, Log (Life) = 0.649
R2 = 92%

Sample Size = 18

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]
2.6.4Custom 455

Custom 455 is a martensitic precipitation hardening stainless steel with nominally 11.75% chromium, 8.5% nickel, 2.25% titanium, and 0.5% molybdenum. It is capable of being aged to very high strength levels.

2.6.4.0Material Specifications and Design Properties
Table 2.6.4.0(a). Material Specifications for Custom 455
Specification Form
AMS 5578Tubing (welded)
AMS 5617Bar and forging
Table 2.6.4.0(b). Design Mechanical and Physical Properties for Custom 455
Specification AMS 5578 AMS 5617
Form Tubing (Welded) Bar
Condition H950 H950 H1000
Thickness or diameter, in.a 0.020–0.062 >0.062 ≤4.000 4.001–6.000 <8.000
Basis S S S S S
Mechanical Properties:
Ftu, ksi:
L220220225220200
LT……225b220b…
ST……225b220b…
Fty, ksi:
L205205210205185
LT……210b205b…
ST……210b205b…
Fcy, ksi:
L……219214193
LT……219214193
ST……219214193
Fsu, ksi……133130124
Fbru, ksi:
(e/D = 1.5)……355347324
(e/D = 2.0)……450440409
Fbry, ksi:
(e/D = 1.5)……311303285
(e/D = 2.0)……366358343
e, percent:
L34101010
LT……5b5b…
ST……5b5b…
RA, percent:
L……404040
LT……20b20b…
ST……20b20b…
E, 103 ksi28.528.9
Ec, 103 ksi30.030.0
G, 103 ksi11.311.5
μ0.270.26
Physical Properties:
ω, lb/in.30.28
C, Btu/(lb)(°F)See Figure 2.6.4.0
K, Btu/[(hr)(ft2)(°F)/ft]See Figure 2.6.4.0
α, 10−6 in./in./°FSee Figure 2.6.4.0
a  Wall thickness for tubing.
b  For Grade 2 material only.

K — At indicated Temperature.

α — Between 70°F and indicated Temperature.

Figure 2.6.4.0. Effect of temperature on the physical properties of Custom 455 (H950) stainless steel.

2.6.4.1H950 Condition

Figure 2.6.4.1.1. Effect of temperature on the tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of Custom 455 (H950) stainless steel bar.

Figure 2.6.4.1.2. Effect of temperature on the ultimate shear strength (Fsu) of Custom 455 (H950) stainless steel bar.

RA — Reduction of Area

e — Elongation

Figure 2.6.4.1.5. Effect of temperature on the elongation (e) and reduction of area (RA) of Custom 455 (H950) stainless steel bar.

Figure 2.6.4.1.6. Typical tensile stress-strain curve for Custom 455 (H950) stainless steel bar at room temperature.

Figure 2.6.4.1.8(a). Best-fit S/N curves for unnotched, Custom 455 (H950) stainless steel bar, longitudinal direction.

Unnotched  |  Longitudinal direction

Correlative Information for Figure 2.6.4.1.8(a)

Product Form: Bar, 1.0625 inch diameter

Properties:

TUS, ksi TYS, ksi Temp., °F
245 242 RT (unnotched)

Specimen Details: Unnotched
0.200-inch diameter

Surface Condition: Hand polished in longitudinal direction, finishing with 3 μ diamond paste

Reference:   2.6.3.1.8

Test Parameters:
Loading - Axial
Frequency - 1800 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: 1

Equivalent Stress Equation:
Log Nf = 38.1−15.7 log Smax, R = −1.0
          = 82.9−34.8 log Smax, R = 0.026
          = 85.9−34.7 log Smax, R = 0.50

Sample Size = 22

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.4.1.8(b). Best-fit S/N curves for notched, Kt = 3.0, Custom 455 (H950) stainless steel bar, longitudinal direction.

Kt = 3.0  |  Longitudinal direction

Correlative Information for Figure 2.6.4.1.8(b)

Product Form: Bar, 1.0625 inch diameter

Properties:

TUS, ksi TYS, ksi Temp., °F
245 242 RT (unnotched)
361 — RT (notched)

Specimen Details: Notched, V-Groove, Kt = 3.0
0.283 inch gross diameter
0.200 inch net diameter
0.010 inch root radius, r
60° flank angle, ω

Surface Condition: Polished with abrasive nylon cord

Reference:   2.6.3.1.8

Test Parameters:
Loading - Axial
Frequency - 1800 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: 1

Equivalent Stress Equation:
Log Nf = 7.42−1.90 log (Seq−47.34)
Seq = Smax (1−R)0.515
Std. Error of Estimate, Log (Life) = 0.246
Standard Deviation, Log (Life) = 0.568
R2 = 81%

Sample Size = 17

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]
2.6.4.2H1000 Condition

Figure 2.6.4.2.1. Effect of temperature on the tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of Custom 455 (H1000) stainless steel bar.

Figure 2.6.4.2.2. Effect of temperature on the ultimate shear strength (Fsu) of Custom 455 (H1000) stainless steel bar.

RA — Reduction of Area

e — Elongation

Figure 2.6.4.2.5. Effect of temperature on the elongation (e) and the reduction of area (RA) of Custom 455 (H1000) stainless steel bar.

Figure 2.6.4.2.6. Typical tensile stress-strain curve for Custom 455 (H1000) stainless steel bar at room temperature.

Figure 2.6.4.2.8. Best-fit S/N curves for notched, Kt = 3.0, Custom 455 (H1000) stainless steel bar, longitudinal direction.

Kt = 3.0  |  Longitudinal direction

Correlative Information for Figure 2.6.4.2.8

Product Form: Bar, 1.0625 inch diameter

Properties:

TUS, ksi TYS, ksi Temp., °F
214 209 RT (unnotched)
335 — RT (notched)

Specimen Details: Notched, V-Groove, Kt=3.0
0.283 inch gross diameter
0.200 inch net diameter
0.010 inch root radius, r
60° flank angle, ω

Surface Condition: Polished with abrasive nylon cord

Reference:   2.6.3.1.8

Test Parameters:
Loading - Axial
Frequency - 1800 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: 1

Equivalent Stress Equation:
Log Nf = 12.37−4.44 log (Seq−21.43)
Seq = Smax (1−R)0.561
Std. Error of Estimate, Log (Life) = 0.359
Standard Deviation, Log (Life) = 0.540
R2 = 56%

Sample Size = 18

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]
2.6.5Custom 465

Custom 465 is a martensitic precipitation hardening stainless steel with nominally 11.75% chromium, 11.0% nickel, 1.75% titanium, and 1.0% molybdenum. It offers higher strength than Custom 455 with improved SCC resistance.

2.6.5.0Material Specifications and Design Properties
Table 2.6.5.0(a). Stress-Corrosion Results for Custom 465 Bara
Condition TYS (T), ksi KIscc, ksi√in. Remarks
H950 226 68 No cracking
H1000 213 98 No cracking
a  Double-cantilever-beam, wedge loaded, constant immersion in 3.5% NaCl (pH 6) per NACE Standard TM0177-96. See Reference 2.6.5.0.
Table 2.6.5.0(b). Tensile Properties of Custom 465 Alloy After Thermal Exposurea
Condition Exposure Temp., °F Exposure Time, Hours Room-temperature properties
UTS, ksi TYS, ksi e, % RA, %
H950 Room Temp. Unexposed 2552381462
6002002582401461
7002002662491359
8002002662491458
9002002362231564
60010002592421659
70010002682501456
80010002722531354
90010002232111967
H1000 Room Temp. Unexposed 2312181666
6002002342201466
7002002412261564
8002002402261466
9002002302181666
60010002322191865
70010002402261664
80010002452291562
90010002222102066
a  Data from 1 heat, 4.5” x1.5” forged bar, duplicate tests
Table 2.6.5.0(c). Material Specifications for Custom 465
Specification Form
AMS 5936 Bars, Wires, and Forgings
Table 2.6.5.0(d). Design Mechanical and Physical Properties for Custom 465
Specification AMS 5936
Form Bar
Condition H950 H1000
Thickness or diameter, in. ≤12.000 ≤12.000
Basis ABAB
Mechanical Properties:
Ftu, ksi:
L240a251220b226
T240a251220b226
Fty, ksi:
L220a236200b212
T220a236200b213
Fcy, ksi:
L233249210223
T233250211224
Fsu, ksi134140129132
Fbruc, ksi:
(e/D = 1.5)359375333342
(e/D = 2.0)462484428440
Fbryc, ksi:
(e/D = 1.5)321344294312
(e/D = 2.0)365391353374
e, percent: (S-basis)
L10...10...
T8...10...
RA, percent: (S-basis)
L45...50...
T35...40...
E, 103 ksi28.728.4
Ec, 103 ksi28.929.4
G, 103 ksi11.211.3
μ0.280.28
Physical Properties:
ω, lb/in.30.280.28
C, Btu/(lb)(°F)...see Figure 2.6.5.0(a)
K, Btu/[(hr)(ft2)(°F)/ft]...see Figure 2.6.5.0(a)
α, 10−6 in./in./°F...see Figure 2.6.5.0(a)
a  S-basis. The rounded T99 value for Ftu (L) = 246 ksi, Ftu (T) = 249, Fty(L) = 230 ksi, and Fty(T) = 231 ksi
b  S-basis. The rounded T99 value for Ftu (L) = 221 ksi, Ftu (T) = 221, Fty(L) = 206 ksi, and Fty(T) = 208 ksi
c  Bearing values are “dry pin” values per Section 1.4.7.1

C — At indicated Temperature.

K — At indicated Temperature.

α — Between 70°F and indicated Temperature.

Figure 2.6.5.0(a). Effect of temperature on the physical properties of Custom 465 H1000 stainless steel bar.

2.6.5.1H950 and H1000 Conditions

Figure 2.6.5.1(a). Typical tensile stress-strain curves for Custom 465, H950 and H1000 condition bar at room temperature.

Figure 2.6.5.1(b). Typical tensile stress-strain curves (full range) for Custom 465 H950 bar at room temperature.

Figure 2.6.5.1(c). Typical tensile stress-strain curves (full range) for Custom 465, H1000 bar at room temperature.

2.6.6PH13-8Mo

PH13-8Mo is a martensitic precipitation hardening stainless steel with nominally 12.7% chromium, 8.2% nickel, 2.2% molybdenum, and 1.1% aluminum. It offers excellent transverse toughness and uniformity of properties due to vacuum arc remelting.

2.6.6.0Material Specifications and Design Properties
Table 2.6.6.0(a). Material Specifications for PH13-8Mo Stainless Steel
Specification Form
AMS 5629 Bar, forging, ring, and extrusion (VIM plus CEVM)
Table 2.6.6.0(b). Design Mechanical and Physical Properties for PH13-8Mo
Specification AMS 5629
Form Round, hex, square and flat bar
Condition H950 H1000 H1025 H1050 H1100 H1150
Thickness or diameter, in. <9.0 <8.0 ≤12.0
Basis ABAB SSSS
Mechanical Properties:a
Ftu, ksi:
L217221201208185175150135
T217221201208185175150135
Fty, ksi:
L198205190b20017516513590
T198205190b20017516513590
Fcy, ksi:
L......200211............
T......200211............
Fsu, ksi......117122............
Fbru, ksi:
(e/D = 1.5)......302313............
(e/D = 2.0)......402416............
Fbry, ksi:
(e/D = 1.5)......263277............
(e/D = 2.0)......338356............
e, percent (S-basis):
L10...10...11121414
T10...10...11121414
RA, percent (S-basis):
L45...50...50505050
T35...40...45455050
E, 103 ksi28.3
Ec, 103 ksi29.4
G, 103 ksi11.0
μ0.28
Physical Properties:
ω, lb/in.30.279
C, Btu/(lb)(°F)0.11 (32 to 212°F) (Est.)
K and αSee Figure 2.6.6.0
a  Design allowables were based mainly upon data from samples of material, supplied in the solution treated condition, which were aged to demonstrate response to heat treatment by suppliers.
b  S-basis. Rounded T99 value = 193 ksi.
Table 2.6.6.0(c). Design Mechanical and Physical Properties for PH13-8Mo Forgings
Specification AMS 5629
Form Forging, flash welded ring, and extrusion
Condition H950H1000H1025H1050H1100H1150
Thickness or diameter, in. <12
Basis SSSSSS
Mechanical Properties:
Ftu, ksi:
L220205185175150135
T220205185175150135
Fty, ksi:
L20519017516513590
T20519017516513590
Fcy, ksi:
L..................
T..................
Fsu, ksi..................
Fbru, ksi:
(e/D = 1.5)..................
(e/D = 2.0)..................
Fbry, ksi:
(e/D = 1.5)..................
(e/D = 2.0)..................
e, percent:
L101011121414
T101011121414
RA, percent:
L455050505050
T354045455050
E, 103 ksi28.3
Ec, 103 ksi29.4
G, 103 ksi11.0
μ0.28
Physical Properties:
ω, lb/in.30.279
C, Btu/(lb)(°F)0.11 (32 to 212°F) (Est.)
K and αSee Figure 2.6.6.0

K — At indicated Temperature.

α — Between 70°F and indicated Temperature.

Figure 2.6.6.0. Effect of temperature on the physical properties of PH13-8Mo stainless steel.

2.6.6.1H950 and H1000 Conditions

Figure 2.6.6.1.1. Effect of temperature on the tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of PH13-8Mo (H950 and H1000) stainless steel bar.

Figure 2.6.6.1.6(a). Typical tensile stress-strain curve at room temperature for PH13-8Mo (H1000) stainless steel bar.

Compressive stress-strain

Compressive tangent modulus

Figure 2.6.6.1.6(b). Typical compressive stress-strain and compressive tangent modulus curves at room temperature for PH13-8Mo (H1000) stainless steel bar.

Figure 2.6.6.1.6(c). Typical tensile stress-strain curves (full range) at room temperature for various heat treated conditions of PH13-8Mo stainless steel bar.

Figure 2.6.6.1.8(a). Best-fit S/N curves for unnotched PH13-8Mo (H1000) forged bar, longitudinal and transverse directions.

Unnotched  |  H1000 forged bar

Correlative Information for Figure 2.6.6.1.8(a)

Product Form: Forged bar, 4 x 5 and 2 x 6 inches

Properties:

TUS, ksi TYS, ksi Temp., °F
205 197 RT

Specimen Details: Unnotched

Gross
Diameter		 Net
Diameter
0.50 – 0.75 0.25

Surface Condition: Polished to RMS 10

References:   2.6.6.1.8(a), (b), (d)

Test Parameters:
Loading - Axial
Frequency - Not Specified
Temperature - RT
Environment - Air

No. of Heats/Lots: 4

Equivalent Stress Equation:
Log Nf = 16.32 − 5.75 log (Seq − 92.6)
Seq = Smax (1 − R)0.64
Std. Error of Estimate, Log (Life) = 0.461
Standard Deviation, Log (Life) = 0.919
R2 = 75%

Sample Size = 86

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.6.1.8(b). Best-fit S/N curves for notched, Kt = 3.0, PH13-8Mo (H1000) forged bar, longitudinal and long transverse directions.

Kt = 3.0  |  H1000 forged bar

Correlative Information for Figure 2.6.6.1.8(b)

Product Form: Forged bar, 4 x 5 and 2 x 6 inches

Properties:

TUS, ksi TYS, ksi Temp., °F
205 197 RT

Specimen Details: Notched, Kt = 3.0

Gross
Diameter		 Net
Diameter		 Notch Root
Radius
0.750 0.252 0.013
0.500 0.250 0.013
60° flank angle

Surface Condition: Notch was polished with abrasively charged wire and rotating wire with oil and aluminum grit

References:   2.6.6.1.8(a), (b), (d)

Test Parameters:
Loading - Axial
Frequency - Not Specified
Temperature - RT
Environment - Air

No. of Heats/Lots: 4

Equivalent Stress Equation:
Log Nf = 9.90 − 3.13 log (Seq − 34.4)
Seq = Smax (1 − R)0.68
Std. Error of Estimate, Log (Life) = 23.1 (1/Seq)
Standard Deviation, Log (Life) = 1.15
R2 = 92%

Sample Size: 104

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.6.1.8(c). Best-fit S/N curves for unnotched PH13-8Mo (H1000) hand forging, longitudinal direction.

Unnotched  |  H1000 hand forging  |  Longitudinal

Correlative Information for Figure 2.6.6.1.8(c)

Product Form: Forged bar, 7 x 7 inches

Properties:

TUS, ksi TYS, ksi Temp., °F
210 204 RT

Specimen Details: Unnotched
0.500 inch gross diameter
0.250 inch net diameter

Surface Condition: Machined to RMS 63–270, solution treated and aged, grit blasted

Reference:   2.6.6.1.8(c)

Test Parameters:
Loading - Axial
Frequency - Not Specified
Temperature - RT
Environment - Air

No. of Heats/Lots: 2

Equivalent Stress Equation:
Log Nf = 18.12 − 6.54 log (Seq)
Seq = Smax (1−R)0.11
Std. Error of Estimate, Log (Life) = 0.263
Standard Deviation, Log (Life) = 0.475
R2 = 69%

Sample Size: 20

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]
2.6.715-5PH

15-5PH is a martensitic precipitation hardening stainless steel with nominally 15.2% chromium, 5.0% nickel, 3.5% copper, and 0.3% niobium/columbium. It was developed to provide better transverse toughness than 17-4PH through vacuum induction melting.

2.6.7.0Material Specifications and Design Properties
Table 2.6.7.0(a). Material Specifications for 15-5PH Stainless Steel
Specification Form
AMS 5659 Bar, forging, ring, and extrusion (CEVM)
AMS 5862 Sheet, strip, and plate (CEVM)
AMS 5400 Investment casting
Table 2.6.7.0(b). Design Mechanical and Physical Properties for 15-5PH Bar
Specification AMS 5659
Form Bara
Condition H900H925H1025H1075H1100H1150
Thickness or diam., in. ≤12≤12≤12≤12≤12≤12
Basis SSSSSS
Mechanical Properties:
Ftu, ksi:
L190170155145140135
T190170155145140135
Fty, ksi:
L170155145125115105
T170155145125115105
Fcy, ksi:
L......143......99
T......143......99
Fsu, ksi......97......85
Fbrub, ksi:
(e/D = 1.5)......263......230
(e/D = 2.0)......332......293
Fbryb, ksi:
(e/D = 1.5)......211......166
(e/D = 2.0)......250......201
e, percent:
L101012131416
T67891011
RA, percent:
L353845454550
T202532333435
E, 103 ksi28.5
Ec, 103 ksi29.2
G, 103 ksi11.2
μ0.27
Physical Properties:
ω, lb/in.30.283
C, Btu/(lb)(°F)...
K and αSee Figure 2.6.7.0
a  Forging, ring, and extrusion product forms are also covered by AMS 5659.
b  Bearing values are “dry pin” values per Section 1.4.7.1.
Table 2.6.7.0(c). Design Mechanical and Physical Properties for 15-5PH Stainless Steel Plate
Specification AMS 5862
Form Plate
Condition H1025a
Thickness, in. 0.187–0.625 0.626–2.000 2.001–3.000 3.001–4.000
Basis SSSS
Mechanical Properties:
Ftu, ksi:
L154154154...
LT155155155155
Fty, ksi:
L143143143...
LT145145145145
Fcy, ksi:
L150150150...
LT152149146...
Fsu, ksi979796...
Fbrub, ksi:
(e/D = 1.5)257257257...
(e/D = 2.0)331331331...
Fbryb, ksi:
(e/D = 1.5)211211211...
(e/D = 2.0)246246246...
e, percent:
LT8121212
RA, percent:
LT35404040
E, 103 ksi28.5
Ec, 103 ksi29.2
G, 103 ksi11.2
μ0.27
Physical Properties:
ω, lb/in.30.283
C, Btu/(lb)(°F)...
K and αSee Figure 2.6.7.0
a  The H900, H925, H1075, H1100, and H1150 conditions are included in AMS 5862.
b  Bearing values are “dry pin” values per Section 1.4.7.1.
Table 2.6.7.0(d). Design Mechanical and Physical Properties for 15-5PH Investment Casting (H935)
Specification AMS 5400
Form Investment casting
Condition H935
Location within casting Any area
Basis S
Mechanical Properties:a
Ftu, ksi170
Fty, ksi150
Fcy, ksi155
Fsu, ksi107
Fbrub, ksi:
(e/D = 1.5)269
(e/D = 2.0)349
Fbryb, ksi:
(e/D = 1.5)209
(e/D = 2.0)240
e, percent6
RA, percent14
E, 103 ksi28.5
Ec, 103 ksi29.2
G, 103 ksi11.2
μ0.27
Physical Properties:
ω, lb/in.30.283
C, Btu/(lb)(°F)...
K, and αSee Figure 2.6.7.0
a  Properties apply only when drawing specifies that conformance to tensile property requirements will be determined from specimens cut from castings or integrally cast specimens.
b  Bearing values are “dry pin” values per Section 1.4.7.1.

K — At indicated Temperature.

α — Between 70°F and indicated Temperature.

Figure 2.6.7.0. Effect of temperature on the physical properties of 15-5PH stainless steel.

2.6.7.1General Design Properties

Figure 2.6.7.1.1. Effect of temperature on the tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of 15-5PH (H925, H1025, and H1100) stainless steel bar.

Figure 2.6.7.1.4. Effect of temperature on the tensile and compressive moduli (E and Ec) of 15-5PH stainless steel.

Figure 2.6.7.1.6(a). Typical tensile stress-strain curves at room temperature for various heat-treated conditions of 15-5PH stainless steel bar.

Compressive Tangent Modulus

Figure 2.6.7.1.6(b). Typical compressive stress-strain and compressive tangent-modulus curves at room temperature for various heat-treated conditions of 15-5PH stainless steel bar.

Compressive Tangent Modulus

Figure 2.6.7.1.6(c). Typical tensile and compressive stress-strain and compressive tangent-modulus curves for 15-5PH (H935) stainless steel casting.

2.6.7.2H1025 Condition

Figure 2.6.7.2.2. Effect of temperature on the compressive yield strength (Fcy) of 15-5PH (H1025) stainless steel bar.

Compressive Tangent Modulus

Figure 2.6.7.2.6(a). Typical compressive stress-strain and compressive tangent-modulus curves at various temperatures for 15-5PH (H1025) stainless steel bar.

Compressive Tangent Modulus

Figure 2.6.7.2.6(b). Tensile and compressive stress-strain and compressive tangent-modulus curves for 15-5PH (H1025) stainless steel plate.

Figure 2.6.7.2.8(a). Best-fit S/N curve for notched, Kt = 3.0, 15-5PH (H1025) stainless steel bar, longitudinal and long transverse directions.

Notched  |  Kt = 3.0  |  Longitudinal and long transverse directions

Correlative Information for Figure 2.6.7.2.8(a)

Product Form: Bar, 2 x 6 inches

Properties:

TUS, ksi TYS, ksi Temp., °F
Longitudinal 163 159 RT
Long Transverse 164 160 RT
Longitudinal 278 — RT (notched)
Long Transverse 277 — RT (notched)

Specimen Details: Notched, V-Groove, Kt = 3.0
0.375 inch gross diameter
0.250 inch net diameter
0.013 inch root radius, r
60° flank angle, ω

Surface Condition: Ground notch

Reference:   2.6.7.2.8(a)

Test Parameters:
Loading - Axial
Frequency - 1800 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: 3

Equivalent Stress Equation:
Log Nf = 19.69 − 9.14 log (Seq − 18.16)
Seq = Smax (1 − R)0.595
Std. Error of Estimate, Log (Life) = 0.449
Standard Deviation, Log (Life) = 0.627
R2 = 49%

Sample Size: 40

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.7.2.8(b). Best-fit S/N curve for unnotched, Kt = 1.0, 15-5PH (H1025) stainless steel plate, longitudinal and long transverse directions.

Unnotched  |  Kt = 1.0  |  Longitudinal and long transverse directions

Correlative Information for Figure 2.6.7.2.8(b)

Product Form: Plate, 0.808 inch, 2.024 inch, and 2.579 inch thick

Properties:

TUS, ksi TYS, ksi Temp., °F
Longitudinal 169.9 165.7 RT
Long Transverse 170.2 166.1 RT

Specimen Details: Unnotched
0.250 inch diameter

Surface Condition: Axial, ground RMS 8

Reference:   2.6.7.2.8(b)

Test Parameters:
Loading - Axial
Frequency - 30 Hz
Temperature - RT
Atmosphere - Air

No. of Heats/Lots: 4

Fatigue Life Equation:
Log Nf = 110.1 − 47.22 log (Smax)
Std. Error of Estimate, Log (Life) = 0.58
Standard Deviation, Log (Life) = 0.84
R2 = 52.8%

Sample Size = 19

Figure 2.6.7.2.8(c). Best-fit S/N curve for notched, Kt = 3.0, 15-5PH (H1025) stainless steel plate, longitudinal and long transverse directions.

Notched  |  Kt = 3.0  |  Longitudinal and long transverse directions

2.6.7.3H1150 Condition

Figure 2.6.7.3.2. Effect of temperature on the compressive yield strength (Fcy) of 15-5PH (H1150) stainless steel bar.

Compressive Tangent Modulus

Figure 2.6.7.3.6. Typical compressive stress-strain and tangent-modulus curves at various temperatures for 15-5PH (H1150) stainless steel bar.

2.6.8PH15-7Mo

PH15-7Mo is a semi-austenitic precipitation hardening stainless steel with nominally 15.2% chromium, 7.1% nickel, 2.2% molybdenum, and 1.2% aluminum. In the TH1050 condition, austenite is conditioned at 1400-°F, refrigerated to −100-°F to transform to martensite, then aged at 1050-°F.

2.6.8.0Material Specifications and Design Properties
Table 2.6.8.0(a). Material Specifications for PH15-7Mo Stainless Steel
Specification Form
AMS 5520 Plate, sheet, and strip
Table 2.6.8.0(b). Design Mechanical and Physical Properties for PH15-7Mo (TH1050)
Specification AMS 5520
Form Sheet, strip, and plate
Condition TH1050
Thickness, in. 0.0015–0.500
Basis S
Mechanical Properties:
Ftu, ksi:
L185
LT190
Fty, ksi:
L165
LT170
Fcy, ksi:
L182
LT188
Fsu, ksi120
Fbru, ksi:
(e/D = 1.5)327
(e/D = 2.0)377
Fbry, ksi:
(e/D = 1.5)259
(e/D = 2.0)272
e, percent:
LTa
E, 103 ksi29.0
Ec, 103 ksi30.0
G, 103 ksi11.4
μ0.28
Physical Properties:
ω, lb/in.30.277
C, Btu/(lb)(°F)...
K and αSee Figure 2.6.8.0
a  See Table 2.6.8.0(c).
Table 2.6.8.0(c). Elongation for PH15-7Mo (TH1050) Sheet, Strip, and Plate
Thickness, inches e (LT), percent
0.0015 to 0.00492
0.0050 to 0.00993
0.010 to 0.0194
0.020 to 0.18745
0.1875 to 0.5006

K — At indicated Temperature.

α — Between 70°F and indicated Temperature.

Figure 2.6.8.0. Effect of temperature on the physical properties of PH15-7Mo (TH1050) stainless steel.

2.6.8.1TH1050 Condition

Figure 2.6.8.1.1. Effect of temperature on the tensile ultimate strength (Ftu), tensile yield strength (Fty), and compressive yield strength (Fcy) of PH15-7Mo (TH1050) stainless steel sheet.

Figure 2.6.8.1.4. Effect of temperature on the tensile and compressive moduli (E and Ec) of PH15-7Mo (TH1050) stainless steel sheet.

Figure 2.6.8.1.6(a). Typical tensile stress-strain curves at various temperatures for PH15-7Mo (TH1050) stainless steel sheet.

Figure 2.6.8.1.6(b). Typical compressive stress-strain curves at various temperatures for PH15-7Mo (TH1050) stainless steel sheet.

Figure 2.6.8.1.6(c). Typical compressive tangent-modulus curves at various temperatures for PH15-7Mo (TH1050) stainless steel sheet.

Figure 2.6.8.1.8(a). Best-fit S/N curves for unnotched PH15-7Mo (TH1050) sheet, longitudinal direction.

Unnotched  |  Longitudinal direction

Correlative Information for Figure 2.6.8.1.8(a)

Product Form: Sheet, 0.025 inch

Properties:

TUS, ksi TYS, ksi Temp., °F
201 196 RT

Specimen Details: Unnotched
2.0 inch gross width
0.75 inch net width

Surface Condition: Specimen edges machined in longitudinal direction, edges polished with 320 grit emery paper

References:   2.6.8.1.8(a) and (b)

Test Parameters:
Loading - Axial
Frequency - 24 and 1800 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: Not specified

Equivalent Stress Equation:
Log Nf = 23.24 − 8.32 log Seq
Seq = Smax (1−R)0.47
Std. Error of Estimate, Log (Life) = 0.35
Standard Deviation, Log (Life) = 0.94
R2 = 86%

Sample Size: 124

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.8.1.8(b). Best-fit S/N curves for notched, Kt = 4.0, PH15-7Mo (TH1050) sheet, longitudinal direction.

Notched  |  Kt = 4.0  |  Longitudinal direction

Correlative Information for Figure 2.6.8.1.8(b)

Product Form: Sheet, 0.025-inch

Properties:

TUS, ksi TYS, ksi Temp., °F
201 196 RT

Specimen Details: Edge Notched, Kt = 4.0
2.25 inch gross width
1.50 inch net width
0.058 inch notch radius
0° flank angle, ω

Surface Condition: Drilled holes near edges and slots milled from edge, corners of notch were beveled with rubber abrasive

Reference:   2.6.8.1.8(b)

Test Parameters:
Loading - Axial
Frequency - 24 and 1800 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: Not specified

Equivalent Stress Equation:
Log Nf = 10.42 − 3.91 log (Seq − 32)
Seq = Smax (1−R)0.58
Std. Error of Estimate, Log (Life) = 0.36
Standard Deviation, Log (Life) = 1.07
R2 = 89%

Sample Size: 74

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.8.1.8(c). Best-fit S/N curves for unnotched PH15-7Mo (TH1050) sheet at 500°F, longitudinal direction.

Unnotched  |  500°F  |  Longitudinal direction

Correlative Information for Figure 2.6.8.1.8(c)

Product Form: Sheet, 0.025 inch

Properties:

TUS, ksi TYS, ksi Temp., °F
201 196 RT
179 173 500

Specimen Details: Unnotched
2.0 inch gross width
0.75 inch net width

Surface Condition: Machined in longitudinal direction, edges polished with 320 grit emery paper

Reference:   2.6.8.1.8(b)

Test Parameters:
Loading - Axial
Frequency - 24 and 1800 cpm
Temperature - 500°F
Environment - Air

No. of Heats/Lots: Not specified

Equivalent Stress Equation:
Log Nf = 11.71 − 4.00 log (Seq − 96)
Seq = Smax (1−R)0.70
Std. Error of Estimate, Log (Life) = 0.44
Standard Deviation, Log (Life) = 0.79
R2 = 69%

Sample Size: 55

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.8.1.8(d). Best-fit S/N curves for notched, Kt = 4.0, PH15-7Mo (TH1050) sheet at 500°F, longitudinal direction.

Notched  |  Kt = 4.0  |  500°F  |  Longitudinal direction

Correlative Information for Figure 2.6.8.1.8(d)

Product Form: Sheet, 0.025 inch

Properties:

TUS, ksi TYS, ksi Temp., °F
201 196 RT
179 173 500

Specimen Details: Edge Notched, Kt = 4.0
2.25 inch gross width
1.50 inch net width
0.058 inch notch radius
0° flank angle, ω

Surface Condition: Drilled holes near edges and slots milled from edge, corners of notch were beveled with rubber abrasive

Reference:   2.6.8.1.8(b)

Test Parameters:
Loading - Axial
Frequency - 24 and 1800 cpm
Temperature - 500°F
Environment - Air

No. of Heats/Lots: Not specified

Equivalent Stress Equation:
Log Nf = 18.60 − 7.92 log (Seq)
Seq = Smax (1−R)0.55
Std. Error of Estimate, Log (Life) = 0.41
Standard Deviation, Log (Life) = 0.86
R2 = 77%

Sample Size: 37

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.8.1.8(e). Best-fit S/N curves for PH15-7Mo (TH1050) sheet at 700°F, transverse direction.

Unnotched  |  700°F  |  Transverse direction

Correlative Information for Figure 2.6.8.1.8(e)

Product Form: Sheet, 0.050 inch

Properties:

TUS, ksi TYS, ksi Temp., °F
175 161 700 (LT)

Specimen Details: Unnotched
2.0 inch gross width
0.375 inch net width

Surface Condition: Polished in longitudinal direction with wet 600 grit silicon carbide paper

Reference:   2.6.8.1.8(c)

Test Parameters:
Loading - Axial
Frequency - 1200 cpm
Temperature - 700°F
Environment - Air

No. of Heats/Lots: Not specified

Equivalent Stress Equation:
Log Nf = 56.92 − 24.46 log (Seq)
Seq = Smax (1−R)0.58
Std. Error of Estimate, Log (Life) = 0.77
Standard Deviation, Log (Life) = 0.99
R2 = 39%

Sample Size: 17

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.8.1.8(f). Best-fit S/N curves for notched, Kt = 3.0, PH15-7Mo (TH1050) sheet at 1000°F, transverse direction.

Notched  |  Kt = 3.0  |  1000°F  |  Transverse direction

Correlative Information for Figure 2.6.8.1.8(f)

Product Form: Sheet, 0.050 inch

Properties:

TUS, ksi TYS, ksi Temp., °F
107 92 1000 (LT)

Specimen Details: Edge Notched, Kt = 3.0
0.535 inch gross width
0.375 inch net width
0.021 inch notch radius
60° flank angle, ω

Surface Condition: Polished longitudinally

Reference:   2.6.8.1.8(c)

Test Parameters:
Loading - Axial
Frequency - 1200 cpm
Temperature - 1000°F
Environment - Air

No. of Heats/Lots: Not specified

Equivalent Stress Equation:
Log Nf = 21.00 − 9.80 log (Seq)
Seq = Smax (1−R)0.78
Std. Error of Estimate, Log (Life) = 0.33
Standard Deviation, Log (Life) = 0.99
R2 = 89%

Sample Size: 16

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]
2.6.917-4PH

17-4PH is the most widely used martensitic precipitation hardening stainless steel, with nominally 16.5% chromium, 4.25% nickel, 3.6% copper, and 0.3% niobium/columbium. It is available in all common wrought forms and as investment castings.

2.6.9.0Material Specifications and Design Properties
Table 2.6.9.0(a). Material Specifications for 17-4PH Stainless Steel
Specification Form
AMS 5604Sheet, strip, and plate
AMS 5643Bar, forging, and ring
AMS 5342Investment casting (H1100)
AMS 5343Investment casting (H1000)
AMS 5344Investment casting (H900)
Table 2.6.9.0(b). Design Mechanical and Physical Properties for 17-4PH Sheet, Strip, and Plate
Specification AMS 5604
Form Sheet, stripa, and plate
Condition H900H925H1025H1075H1100H1150
Thickness, in. ≤ 4.000
Basis SSSSSS
Mechanical Properties:
Ftu, ksi:
L..................
LT190170155145140135
Fty, ksi:
L..................
LT170155145125115105
Fcy, ksi:
L..................
LT..................
Fsu, ksi..................
Fbru, ksi:
(e/D = 1.5)..................
(e/D = 2.0)..................
Fbry, ksi:
(e/D = 1.5)..................
(e/D = 2.0)..................
e, percent:
LTbbbbbb
E, 103 ksi28.5
Ec, 103 ksi30.0
G, 103 ksi11.2
μ0.27
Physical Properties:
ω, lb/in.30.282 (H900), 0.283 (H1075), 0.284 (H1150)
C, K, and αSee Figure 2.6.9.0
a  Test direction longitudinal for widths less than 9 inches; long transverse for widths 9 inches and over.
b  See Table 2.6.9.0(c).
Table 2.6.9.0(c). Elongation for 17-4PH Sheet, Strip, and Plate by Thickness and Condition
Thickness e, percent (LT)
H900H925H1025H1075H1100H1150
0.015 through 0.186555558
0.187 through 0.62588891010
0.626 through 4.000101012131416
Table 2.6.9.0(d). Design Mechanical and Physical Properties for 17-4PH Forgings
Specification AMS 5643
Form Forging, tubing, and rings
Condition H900H925H1025H1075H1100H1150H1150Ma
Thickness, in. <8.000
Basis SSSSSSS
Mechanical Properties:
Ftu, ksi:
L190170155145140135115
T.....................
Fty, ksi:
L17015514512511510575
T.....................
Fcy, ksi:
L.....................
T.....................
Fsu, ksi.....................
Fbru, ksi:
(e/D = 1.5).....................
(e/D = 2.0).....................
Fbry, ksi:
(e/D = 1.5).....................
(e/D = 2.0).....................
e, percent:
L10101213141618
E, 103 ksi28.5
Ec, 103 ksi30.0
G, 103 ksi11.2
μ0.27
Physical Properties:
ω, lb/in.30.282 (H900), 0.283 (H1075), 0.284 (H1150)
C, K, and αSee Figure 2.6.9.0
a  Not covered by AMS 5643. S values are producers' guaranteed minimum tensile properties.
Table 2.6.9.0(e). Design Mechanical and Physical Properties for 17-4PH Bar
Specification AMS 5643
Form Bar
Condition H900 H925 H1025 H1075 H1100 H1150 H1150Ma
Thickness or diameter, in. <8.000
Basis AB AB S AB S AB Sa
Mechanical Properties:b
Ftu, ksi:
L190195170178155143150140125134115
T.................................
Fty, ksi:
L170175155c167145125d14311510011575
T.................................
Fcy, ksi:
L170175......139.........90104...
T.................................
Fsu, ksi123126......95.........7985...
Fbru, ksi:
(e/D = 1.5)313322......263e.........213e228e...
(e/D = 2.0)380390......332e.........270e289e...
Fbry, ksi:
(e/D = 1.5)255262......211e.........152e175e...
(e/D = 2.0)280288......250e.........181e208e...
e, percent (S-basis):
L10...10...1213...1416...18
E, 103 ksi28.5
Ec, 103 ksi30.0
G, 103 ksi11.2
μ0.27
Physical Properties:
ω, lb/in.30.282 (H900), 0.283 (H1075), 0.284 (H1150)
C, K, and αSee Figure 2.6.9.0
a  Not covered by AMS 5643. S values are producer's guaranteed minimum tensile properties.
b  Design allowables were based upon data from samples of material, supplied in the solution treated condition, which were aged to demonstrate response to heat treatment by suppliers.
c  S-basis. Rounded T99 value = 157 ksi.
d  S-basis. Rounded T99 value = 136 ksi.
e  Bearing values are “dry pin” values per Section 1.4.7.1.
Table 2.6.9.0(f). Design Mechanical and Physical Properties for 17-4PH Investment Castings
Specification AMS 5344 AMS 5343 AMS 5342
Form Investment Casting
Condition a H1000b H1100c
Location within casting Any area
Basis SSS
Mechanical Properties:d
Ftu, ksi180150130
Fty, ksi160130120
Fcy, ksi...132...
Fsu, ksi...98...
Fbrue, ksi:
(e/D = 1.5)...254...
(e/D = 2.0)...329...
Fbrye, ksi:
(e/D = 1.5)...189...
(e/D = 2.0)...222...
e, percent446
RA, percent121215
E, 103 ksi28.5
Ec, 103 ksi30.0
G, 103 ksi12.7
μ0.27
Physical Properties:
ω, lb/in.30.282 (H900)
C, K, and αSee Figure 2.6.9.0
a  Aged at 900 to 925°F for 90 minutes.
b  Aged at 985 to 1015°F for 90 minutes.
c  Aged at 1085 to 1115°F for 90 minutes.
d  Properties apply only when drawing specifies that conformance to tensile property requirements will be determined from specimens cut from casting or integrally cast specimens.
e  Bearing values are “dry pin” values per Section 1.4.7.1.

C — At indicated temperature.

K — At indicated temperature.

α — Between 70°F and indicated temperature.

Figure 2.6.9.0. Effect of temperature on the physical properties of 17-4PH stainless steel.

2.6.9.1H900 Condition

Figure 2.6.9.1.2. Effect of temperature on the compressive yield strength (Fcy) and the shear ultimate strength (Fsu) of 17-4PH (H900) stainless steel bar and forging.

Figure 2.6.9.1.3. Effect of temperature on the bearing ultimate strength (Fbru) and the bearing yield strength (Fbry) of 17-4PH (H900) stainless steel bar and forging.

Figure 2.6.9.1.4. Effect of temperature on the tensile and compressive moduli (E and Ec) of 17-4PH (H900) stainless steel bar and forging.

Figure 2.6.9.1.8(a). Best-fit S/N curves for unnotched 17-4PH (H900) bar, longitudinal direction.

Unnotched  |  Longitudinal direction

Correlative Information for Figure 2.6.9.1.8(a)

Product Form: Bar, 1 inch and 1.125 inch diameter

Properties:

TUS, ksi TYS, ksi Temp., °F
202 195 RT

Specimen Details: Unnotched
1.25 inch gross diameter
0.252 inch net diameter

Surface Condition: Polished

References:   2.6.9.1.8(a)

Test Parameters:
Loading - Axial
Frequency - 1800 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: Not specified

Equivalent Stress Equation:
Log Nf = 30.6 − 11.2 log (Seq)
Seq = Smax (1−R)0.52
Std. Error of Estimate, Log (Life) = 0.531
Standard Deviation, Log (Life) = 0.672
R2 = 38%

Sample Size: = 42

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.9.1.8(b). Best-fit S/N curves for notched, Kt = 3.0, 17-4PH (H900) bar, longitudinal direction.

Notched  |  Kt = 3.0  |  Longitudinal direction

Correlative Information for Figure 2.6.9.1.8(b)

Product Form: Bar, 1 inch and 1.125 inch diameter

Properties:

TUS, ksi TYS, ksi Temp., °F
202 195 RT

Specimen Details: Circumferential V-Groove, Kt = 3.0

Gross
diameter
inches		 Net
diameter
inches		 Notch
radius
inches
0.430 0.300 0.016
0.357 0.252 0.013
60° flank angle, ω

Surface Condition: Polished

Reference:   2.6.9.1.8(a)

Test Parameters:
Loading - Axial
Frequency - Not specified
Temperature - RT
Environment - Air

No. of Heats/Lots: Not specified

Equivalent Stress Equation:
Log Nf = 9.10 − 2.79 log (Seq − 48.4)
Seq = Smax (1−R)0.67
Std. Error of Estimate, Log (Life) = 0.235
Standard Deviation, Log (Life) = 0.897
R2 = 93%

Sample Size: 39

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]

Figure 2.6.9.1.8(c). Best-fit S/N curves for notched, Kt = 4.0, 17-4PH (H900) bar, longitudinal direction.

Notched  |  Kt = 4.0  |  Longitudinal direction

Correlative Information for Figure 2.6.9.1.8(c)

Product Form: Bar, 0.787 inch diameter, vacuum melted

Properties:

TUS, ksi TYS, ksi Temp., °F
207 — RT

Specimen Details: Circumferential V-Groove, Kt = 4.0
0.492 inch gross diameter
0.256 inch net diameter
0.008 inch notch radius, n
60° flank angle, ω

Surface Condition: Machined and aged

Reference:   2.6.9.1.8(b)

Test Parameters:
Loading - Axial
Frequency - 2000 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: 1

Equivalent Stress Equation:
Log Nf = 9.03 − 2.91 log (Seq − 26.1)
Seq = Smax (1−R)0.51
Std. Error of Estimate, Log (Life) = 0.345
Standard Deviation, Log (Life) = 0.812
R2 = 82%

Sample Size: = 22

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]
2.6.9.2General Temperature Properties (Multiple Conditions)

Figure 2.6.9.2.1. Effect of temperature on the tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of 17-4PH (H900, H925, H1025, and H1075) stainless steel bar.

Figure 2.6.9.2.6(a). Typical tensile stress-strain curves at room temperature for various heat treated conditions of 17-4PH stainless steel bar.

Compressive stress-strain

Compressive tangent modulus

Figure 2.6.9.2.6(b). Typical compressive stress-strain and compressive tangent modulus curves at room temperature for various heat treated conditions of 17-4PH stainless steel bar.

2.6.9.3H1000 Condition

Figure 2.6.9.3.6(a). Typical tensile stress-strain curve for 17-4PH (H1000) stainless steel casting at room temperature.

Compressive stress-strain

Compressive tangent modulus

Figure 2.6.9.3.6(b). Typical compressive stress-strain and compressive tangent modulus curves for 17-4PH (H1000) stainless steel casting at room temperature.

2.6.9.4H1025 Condition

Figure 2.6.9.4.8. Best-fit S/N curves for notched, Kt = 3.0, fatigue behavior of 17-4PH (H1025) stainless steel bar, longitudinal and long transverse directions.

Notched  |  Kt = 3.0  |  Longitudinal and long transverse directions

Correlative Information for Figure 2.6.9.4.8

Product Form: Bar, 2 x 6 inches

Properties:

TUS, ksi TYS, ksi Temp., °F
Longitudinal 165 161 RT
Long Transverse 164 158 RT
Longitudinal 280 — RT (notched)
Long Transverse 275 — RT (notched)

Specimen Details: Notched V-Groove, Kt = 3.0
0.375 inch gross diameter
0.250 inch net diameter
0.013 inch root radius, r
60° flank angle, ω

Surface Condition: Notched: Ground notch

Reference:   2.6.6.2.8

Test Parameters:
Loading - Axial
Frequency - 1800 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: 3

Equivalent Stress Equation:
Log Nf = 21.60 − 9.24 log (Seq)
Seq = Smax (1−R)0.581
Std. Error of Estimate, Log (Life) = 0.413
Standard Deviation, Log (Life) = 0.724
R2 = 67%

Sample Size: = 44

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]
2.6.9.5H1100 Condition

Figure 2.6.9.5.8. Best-fit S/N curves for notched, Kt = 4.0, 17-4PH (H1100) bar, longitudinal direction.

Notched  |  Kt = 4.0  |  Longitudinal direction

Correlative Information for Figure 2.6.9.5.8

Product Form: Bar, 0.787 inch diameter

Properties:

TUS, ksi TYS, ksi Temp., °F
151 — RT

Specimen Details: Circumferential V-Groove, Kt = 4.0
0.492 inch gross diameter
0.256 inch net diameter
0.008 inch notch radius, r
60° flank angle, ω

Surface Condition: Machined then aged

Reference:   2.6.9.1.8(b)

Test Parameters:
Loading - Axial
Frequency - 2000 cpm
Temperature - RT
Environment - Air

No. of Heats/Lots: Not Specified

Equivalent Stress Equation:
Log Nf = 14.6 − 5.56 log (Seq)
Seq = Smax (1−R)0.69
Std. Error of Estimate, Log (Life) = 0.301
Standard Deviation, Log (Life) = 0.556
R2 = 71%

Sample Size: = 21

[Caution: The equivalent stress model may provide unrealistic life predictions for stress ratios beyond those represented above.]
2.6.9.6H1150 Condition

Figure 2.6.9.6.1. Effect of temperature on the tensile ultimate strength (Ftu) and the tensile yield strength (Fty) of 17-4PH (H1150) stainless steel bar.

2.6.1017-7PH

17-7PH is a semi-austenitic precipitation hardening stainless steel with nominally 17.0% chromium, 7.1% nickel, and 1.2% aluminum. In the TH1050 condition, the austenite is conditioned at 1400-°F, refrigerated to −100-°F to transform to martensite, then aged at 1050-°F. In the RH950 condition, the austenite is conditioned at 1750-°F, refrigerated to −100-°F, then aged at 950-°F.

2.6.10.0Material Specifications and Design Properties
Table 2.6.10.0(a). Material Specifications for 17-7PH Stainless Steel
Specification Form
AMS 5528 Plate, sheet, and strip
Table 2.6.10.0(b). Design Mechanical and Physical Properties for 17-7PH (TH1050)
Specification AMS 5528
Form Sheet Plate
Condition TH1050
Thickness, in. 0.015–0.187 0.188–0.500 0.501–1.000
Basis ABSS
Mechanical Properties:a
Ftu, ksi:
L177183......
LT177184180180
Fty, ksi:
L150b167......
LT150c167150150
Fcy, ksi:
L160179160...
LT166185166...
Fsu, ksi112117114...
Fbru, ksi:
(e/D = 1.5)305317310...
(e/D = 2.0)351365357...
Fbry, ksi:
(e/D = 1.5)228254228...
(e/D = 2.0)240267240...
e, percent (S-basis):
LTd...66
E, 103 ksi29.0
Ec, 103 ksi30.0
G, 103 ksi11.5
μ0.28
Physical Properties:
ω, lb/in.30.276
C, K, and αSee Figure 2.6.10.0
a  Design allowables were based upon data from samples of material, supplied in the solution treated condition, which were austenite conditioned and aged to demonstrate response to heat treatment by suppliers. Properties obtained by the user may be different if the material has been formed or otherwise cold worked.
b  The rounded T99 value of 158 ksi was reduced to agree with transverse specification value.
c  S-Basis. The rounded T99 value equals 159 ksi.
d  See Table 2.6.10.0(c).
Table 2.6.10.0(c). Elongation for 17-7PH Sheet (TH1050) by Thickness
Thickness, in. Elongation (LT), percent
0.005 to 0.0104
0.011 to 0.0195
0.020 to 0.1876

K — At indicated temperature.

α — Between 70°F and indicated temperature.

C — At indicated temperature.

Figure 2.6.10.0. Effect of temperature on the physical properties of 17-7PH stainless steel.

2.6.10.1TH1050 Condition

Figure 2.6.10.1.1. Effect of temperature on the tensile ultimate strength (Ftu), tensile yield strength (Fty), and compressive yield strength (Fcy) of 17-7PH (TH1050) stainless steel sheet.

Figure 2.6.10.1.2. Effect of temperature on the ultimate shear strength (Fsu) of 17-7PH (TH1050) stainless steel sheet.

Figure 2.6.10.1.4(a). Effect of temperature on the tensile and compressive moduli (E and Ec) of 17-7PH (TH1050) stainless steel sheet.

Figure 2.6.10.1.4(b). Effect of temperature on Poisson’s ratio (μ) for 17-7PH (TH1050) stainless steel sheet.

Figure 2.6.10.1.6(a). Typical tensile stress-strain curves at various temperatures for 17-7PH (TH1050) stainless steel sheet.

Figure 2.6.10.1.6(b). Typical compressive stress-strain curves at various temperatures for 17-7PH (TH1050) stainless steel sheet.

Figure 2.6.10.1.6(c). Typical compressive tangent-modulus curves at various temperatures for 17-7PH (TH1050) stainless steel sheet.

References
  • 2.6.3.1.8Unpublished data on fatigue properties of Custom 450 stainless steel, H900 condition.
  • 2.6.5.0Carpenter Technology Corporation, "Custom 465 Stainless Steel," Product Data Bulletin, Reading, PA.
  • 2.6.6.1.8(a)Unpublished data on fatigue properties of PH13-8Mo stainless steel, H950 condition, unnotched specimens.
  • 2.6.6.1.8(b)Unpublished data on fatigue properties of PH13-8Mo stainless steel, H950 condition, notched specimens.
  • 2.6.6.1.8(c)Unpublished data on fatigue properties of PH13-8Mo stainless steel, H1000 condition.
  • 2.6.6.1.8(d)Unpublished supplemental fatigue data for PH13-8Mo stainless steel.
  • 2.6.7.2.8(a)Unpublished data on fatigue properties of 15-5PH stainless steel, H1025 condition, unnotched specimens.
  • 2.6.7.2.8(b)Unpublished data on fatigue properties of 15-5PH stainless steel, H1025 condition, notched specimens.
  • 2.6.8.1.8(a)Unpublished data on fatigue properties of PH15-7Mo stainless steel, TH1050 condition, sheet specimens.
  • 2.6.8.1.8(b)Unpublished data on fatigue properties of PH15-7Mo stainless steel, TH1050 condition, bar specimens.
  • 2.6.8.1.8(c)Unpublished supplemental fatigue data for PH15-7Mo stainless steel, TH1050 condition.
  • 2.6.9.1.8(a)Unpublished data on fatigue properties of 17-4PH stainless steel, H900 condition, unnotched specimens.
  • 2.6.9.1.8(b)Unpublished data on fatigue properties of 17-4PH stainless steel, H900 condition, notched specimens.
Other MIL-HDBK-5 Chapters
Chapter 1 (General) Chapter 3 (Aluminum)

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