KasperCalc: MIL-HDBK-5 3.9 300.0 Series Cast Alloys

Chapter 3.9 Contents

3.9300.0 Series Cast Alloys 3.9.1354.0 Alloy 3.9.1.0Comments and Properties 3.9.2355.0 Alloy 3.9.2.0Comments and Properties 3.9.3C355.0 Alloy 3.9.3.0Comments and Properties 3.9.4356.0 Alloy 3.9.4.0Comments and Properties 3.9.5A356.0 Alloy 3.9.5.0Comments and Properties 3.9.5.1T6P Temper 3.9.6A357.0 Alloy 3.9.6.0Comments and Properties 3.9.6.1T6 Temper 3.9.7D357.0 Alloy 3.9.7.0Comments and Properties 3.9.7.1T6 Temper 3.9.8359.0 Alloy 3.9.8.0Comments and Properties

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Chapter 1 — General Chapter 2 — Steel Chapter 3 — Aluminum 3.1 — General 3.2 — 2000 Series Wrought Alloys 3.5 — 5000 Series Wrought Alloys 3.6 — 6000 Series Wrought Alloys 3.7 — 7000 Series Wrought Alloys 3.8 — 200.0 Series Cast Alloys 3.9 — 300.0 Series Cast Alloys 3.10 — Element Properties Chapter 4 — Magnesium

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).

Table of Tables

Table of Figures

Fig 3.9.2.0Effect of temperature on the thermal expansion of 355.0 aluminum alloy casting. Fig 3.9.4.0Effect of temperature on the thermal expansion of 356.0 aluminum alloy casting. Fig 3.9.5.1.6(a)Typical tensile and compressive stress-strain and compressive tangent-modulus curves for A356.0-T6P aluminum alloy casting at room temperature. Fig 3.9.5.1.6(b)Typical tensile stress-strain (full-range) curve for A356.0-T6P aluminum alloy casting at room temperature. Fig 3.9.6.1.6Typical tensile stress-strain curve for A357.0-T6 aluminum alloy casting, Class 2, designated area, at room temperature. Fig 3.9.7.1.6Typical tensile stress-strain curve for D357.0-T6 aluminum alloy casting, designated area, at room temperature.

3.9300.0 Series Cast Alloys

Casting alloys of the 300.0 series contain silicon with added copper and/or magnesium as the principal alloying elements. They are heat treatable. Because of the high silicon content, they are among the easiest to cast by a variety of techniques. They have high resistance to corrosion.

3.9.1354.0 Alloy

3.9.1.0Comments and Properties

354.0 is a heat-treatable Al-Si-Mg alloy being among the highest strength of commercial casting alloys. It has good casting characteristics; however, its use is generally restricted to permanent mold castings. Refer to Section 3.1.3.4 for comments regarding the weldability.

A material specification for 354.0 aluminum alloy is presented in Table 3.9.1.0(a). Room-temperature mechanical and physical properties are shown in Table 3.9.1.0(b).

Specification	AMS-A-21180
Form	Casting
Temper	T6
Location Within Casting	Designated area		Nondesignated area
Strength Class Number^a	1	2	10	11
Basis	S	S	S	S
Mechanical Properties^b,c:
F_tu, ksi	47	50	47	43
F_ty, ksi	36	42	36	33
F_cy, ksi	36	42	36	33
F_su, ksi	29	31	29	27
F_bru^d, ksi:
(e/D = 1.5)	81	86	81	74
(e/D = 2.0)	101	107	101	92
F_bry^d, ksi:
(e/D = 1.5)	57	66	57	52
(e/D = 2.0)	67	78	67	62
e, percent	3	2	3	2
E, 10³ ksi	10.6
E_c, 10³ ksi	10.8
G, 10³ ksi	4.0
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, Btu/(lb)(°F)	0.23 (at 212°F)
K, Btu/[(hr)(ft²)(°F)/ft]	···
α, 10^-6 in./in./°F	1.6 (68 to 212°F)
^a The attainable strength class number is dependent on the casting configuration, complexity, and size (both weight and wall thickness). Favorable experience with a particular configuration may allow some foundries to produce a higher strength class number than others. In case of doubt regarding the strength class number, the designer should consult or negotiate with the foundry to determine the proper strength class number to assign for a specific casting.
^b For any casting process; i.e., special mold, permanent mold, or sand mold (including chilling).
^c The mechanical properties shown are reliably obtainable in castings of this alloy and heat-treat condition when produced under the quality assurance provisions of AMS-A-21180. These provisions require preproduction approval, documentation of foundry procedures, and specific destructive and nondestructive testing procedures for the acceptance of each production lot of castings. Strict adherence to these requirements is mandatory if these properties are to be reliably assured in each casting.
^d Bearing values are “dry pin” values per Section 1.4.7.1.

Specification	AMS 4281
Form	Permanent mold casting
Temper	T6
Location Within Casting	As specified
Basis	S
Mechanical Properties:
F_tu, ksi	27^a
F_ty, ksi	17^a
F_cy, ksi	17
F_su, ksi	17
F_bru^b, ksi:
(e/D = 1.5)	46
(e/D = 2.0)	58
F_bry^b, ksi:
(e/D = 1.5)	27
(e/D = 2.0)	32
e, percent	0.4^a
E, 10³ ksi	10.3
E_c, 10³ ksi	10.3
G, 10³ ksi	3.8
μ	0.33
Physical Properties:
ω, lb/in.³	0.098
C, Btu/(lb)(°F)	0.23 (at 212°F)
K, Btu/[(hr)(ft²)(°F)/ft]	88 (at 77°F)
α, 10^-6 in./in./°F	See Figure 3.9.2.0
^a Conformance to tensile property requirements is determined by testing specimens cut from casting only when specified on drawing.
^b Bearing values are “dry pin” values per Section 1.4.7.1.

Specification	Form
AMS 4284	Permanent mold casting
AMS 4217	Sand casting
AMS 4260	Investment casting

Specification	AMS 4218
Form	Sand, investment, permanent mold, and composite castings
Temper	T6P^a
Location Within Casting	Any
Basis	S
Mechanical Properties^b:
F_tu, ksi	32
F_ty, ksi	22
F_cy, ksi	22
F_su, ksi	20
F_bru, ksi:
(e/D = 1.5)	55
(e/D = 2.0)	68
F_bry, ksi:
(e/D = 1.5)	35
(e/D = 2.0)	41
e, percent	2
E, 10³ ksi	10.4
E_c, 10³ ksi	10.5
G, 10³ ksi	3.9
μ	0.33
Physical Properties:
ω, lb/in.³	0.097
C, Btu/(lb)(°F)	0.23 (at 212°F)
K, Btu/[(hr)(ft²)(°F)/ft]	88 (at 77°F)
α, 10^-6 in./in./°F	See Figure 3.9.4.0
^a The letter, P, indicates a variation compared to the standard heat treatment procedure of this temper and/or a difference in the minimum tensile property requirements compared to the Aluminum Association’s registered limits.
^b The mechanical properties shown are reliably obtainable when produced under the quality assurance provisions of AMS 4218. These procedures require radiographic control and specific destructive testing for acceptance of each production lot. Strict adherence to these requirements is mandatory if these properties are to be reliably assured in each casting.

Specification	AMS-A-21180
Form	Casting^a
Temper	T6
Location Within Casting	Designated area		Nondesignated area
Strength Class Number^b	1	2	10	11	12
Basis	S	S	S	S	S
Mechanical Properties:^c
F_tu, ksi	45	50	38	41	45
F_ty, ksi	35	40	28	31	35
F_cy, ksi	35	40	28	31	35
F_su, ksi	28	31	24	26	28
F_bru^d, ksi:
(e/D = 1.5)	77	86	65	70	77
(e/D = 2.0)	96	107	81	88	96
F_bry^d, ksi:
(e/D = 1.5)	55	63	44	49	55
(e/D = 2.0)	65	75	52	58	65
e, percent	3	5	5	3	3
E, 10³ ksi	10.4
E_c, 10³ ksi	10.5
G, 10³ ksi	3.9
μ	0.33
Physical Properties:
ω, lb/in.³	0.097
C, Btu/(lb)(°F)	0.23 (at 212°F)
K, Btu/[(hr)(ft²)(°F)/ft]	88 (at 77°F)
α, 10^-6 in./in./°F	12.0 (68 to 212°F)
^a For any casting process; i.e., special mold, permanent mold, or sand mold (including chilling).
^b The attainable strength class number is dependent on the casting configuration, complexity, and size (both weight and wall thickness). Favorable experience with a particular configuration may allow some foundries to produce a higher strength class number than others. In case of doubt regarding the strength class number, the designer should consult or negotiate with the foundry to determine the proper strength class number to assign for a specific casting.
^c The mechanical properties shown are reliably obtainable in castings of this alloy and heat-treat condition when produced under the quality assurance provisions of AMS-A-21180. These provisions require preproduction approval, documentation of foundry procedures, and specific destructive and nondestructive testing procedures for the acceptance of each production lot of castings. Strict adherence to these requirements is mandatory if these properties are to be reliably assured in each casting.
^d Bearing values are “dry pin” values per Section 1.4.7.1.

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