Iron Castings - Gray

Gray Iron is the most widely used of the foundry casting alloys. The characteristic gray color is due to flakes of graphite contained in the metal. Graphite helps to make the properties of gray iron excellent for machining, outstanding in wear resistance and high-vibration damping.

Specifying Body Spec No Grade or Class of Material Tensile Strength
(psi)
Brinell Range (BHN) Typical Applications
ASTM
SAE
ASTM
ASME
A48-94A
J431
A159-83
25 25,000 170-229 General machinery, municipal and water works, light compressors. Machine tools, medium gear blanks, heavy compressors. Dies, crankshafts, high pressure cylinders, heavy duty machine tool parts, large gears, press frames.
30 30,000 187-241
35 35,000 207-255
40 40,000 217-269