sion cases, oil pans, rear axle housings, brackets, water-cooled cylinder blocks, various fittings and pump bodies. Tis alloy is used in various marine applica- tions in the T6 heat treat condition where pressure tightness or corrosion resistance are major requirements. Alloy A356—Because of its lower
level of impurities, alloy A356 has greater elongation, higher strength and considerably higher ductility than 356. Typical applications are airframe cast- ings, machine parts, truck chassis parts, aircraft and missile components and structural parts requiring high strength. Alloys A380 and B380—These al-
loys are used for general-purpose die castings. They have good mechani-
cal properties and are used to make housings for lawn mowers and radio transmitters, air brake castings, gear cases and air-cooled cylinder heads. Alloys A390 and B390—Tese
companion alloys are hypereutectic aluminum-silicon alloys. Te optimum structure of either alloy must consist of fine, uniformly distributed primary silicon crystals in a eutectic matrix. Tis alloy does not require heat treatment, which may eliminate internal stresses that may cause fatigue failure. The low coefficient of thermal ex-
pansion, high hardness and excellent wear resistance of these alloys make them suitable for internal combustion engine pistons and blocks and cyl-
Alloy
Table 2. Typical Mechanical Properties of Common Cast Aluminum Alloys and Tempers Ultimate
Casting Process & Temper
201.0 / A201.0 A206.0 319.0 / A319.0
Sand & PM—T42 Sand & PM—T6 Sand & PM—T7 Sand—T4 PM—T4 PM—T7 Sand—F Sand—T5 Sand—T6 PM—F
355.0
PM—T6 Sand—F
Sand—T51 Sand—T6 Sand—T7 PM—F
356.0
PM—T51 PM—T6 PM—T62 PM—T7 PM—T7 Sand—F
Sand—T51 Sand—T6 Sand—T71 PM—F
A356.0
PM—T51 PM—T6 PM—T7 Sand—F
Sand—T51 Sand—T-6 Sand—T71 PM—F
535.0 PM=Permanent mold 2013 Casting sourCe DireCtory Metal Casting Design & PurChasing 29
PM—T51 PM—T6 PM—T61 Sand—F
Strength (ksi) 60 65 68 51
62 63 27 30 36 34 40 23 28 35 38 27 30 42 45 40 36 24 25 33 28 26 27 38 32 23 26 40 30 27 29 41 41
40
Yield Strength (set .02%-ksi)
37 55 60 36 38 50 18
26 24 19
27 12
23 25 36 15
24 27 40 30 31 18
20 24 21 18
20 27 24 12 18
30 20 13
20 30 30 20
% Elongation (min. 2 in.)
17.0 8.0 5.5 7.0
17.0 12.0 2.0 1.5
2.0 2.5 3.0 3.0 1.5
3.0 0.5 4.0 2.0 4.0 1.5
2.0 3.0 6.0 2.0 3.5 3.5 5.0 2.0 5.0 6.0 6.0 3.0 6.0 3.0 8.0 5.0
12.0 10.0 13.0
inder bodies for compressors, pumps and brakes. Alloy 535—Alloy 535 is an alumi- num-magnesium alloy possessing a high, stable combination of strength, shock resistance and ductility. It is suited for parts in instruments and computing devices where dimensional stability is of major importance. In addition to the high ductil-
ity and tensile strength of 535, the Charpy impact is 10–12 lbs. (4.5- 5.4 kg), which makes it suitable for shock-resistant applications. In ad- dition, this alloy doesn’t require heat treatment. Brackets, C-clamps and machined parts that need strength, as well as impellers, optical equipment
Shear
Strength (ksi) —
42 40 40 42 37 22 24 29 24 27 —
22 28 28 —
24 34 36 30 27 —
20 26 20 — —
30 25 — — — — — — — —
27
Brinell Hardness (500 kg load on 10 mm ball)
—
130 146 — — —
70 80 80 85 95 —
65 80 85 —
75 90
105 85 85 —
60 70 60 — —
80 70 — —
75 — — —
80 90 70
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