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Comparison Table for Some Gray Iron Casting Grades

ASTM A48, SAE J431, GM 274M and ASTM A126 are standards for gray cast iron. They have some grades which have some equal or similar mechanical properties, such as tensile strength and hardness.

This is a comparison table for some gray iron casting grades in these standards:

Specifications

Grade

Tensile Strength (PSI)

Hardness (BHN)

ASTM A48

Class 25

25,000

170-229

SAE J431

G2500

25,000

170-229

GM274M

G150

21,750

143-207

ASTM A48

Class 30

30,000

187-241

ASTM A126

Class B

31,000

 -

SAE J431

G3000

30,000

187-241

GM274M

G200

29,000

170-229

GM274M

G205

29,725

179-241

ASTM A48

Class 35

35,000

207-255

SAE J431

G3500

35,000

207-255

GM274M

G240

34,800

179-255

GM274M

G250

36,250

187-255

Gray iron castings have good casting properties, vibration damping, wear resistance, machinability and low notch sensitivity. And gray iron castings are fitted for general machinery, automotive parts, and valve bodies, such as engine, clutch, valve deck, valve, fire hydrant and so on.

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