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Heat treatment of aluminum castings

Heat treatment

F As Cast - Castings are cooled naturally from the mold in room temperature air with no further heat-treatment.
T-51 Aging Treatment - Castings that are artificially aged by heating metal to 400F for 7-9 hours.
T-6 Solution Heat-treated and Artificially Aged - Castings are Solution Heat-treated by heating metal to 1000F for 4-12 hours and quenched in water at 150-212F.
T-7 Solution Heat-treated and Stabilized - Castings are stabilized to carry them beyond the point of maximum hardness, providing control of growth or residual stress, or both.

 

Properties of Cast and Wrought Alloys

Alloy Heat Treatment* Tensile Strength, Ultimate (ksi) Tensile Strength, Yield (ksi) Elongation in 2 inches (%) Typical Brinell Hardness (500 kgf load, (10-mm ball))
A356.2 F 19 ?/font 3 40-70
A356.2 T51 23 16 ?/font 45-75
A356.2 T6 30 28 3 55-90
A356.2 T7 31 29 3 60-90
A319 T6 31 20 1.5 65-95
535 (Almag) F 35 18 8 60-90
Zinc-ZA8 F 38 28 1.5 85-90
Zinc-ZA12 F 42 30 2 105-125
6061 (Wrought) T6 45 40 12 95
A380 (Die Cast) F 47 23 3.5 80

 

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