Gray Iron

Metals Poured: Iron Specifications Summary

Specifying Body and Spec. Number	Typical Casting Use	Grade or Class	Minimum Tensile PSI	Minimum Yield PSI	Percent Elongation %	Brinell Hardness Range
ASTM	General	Gray
A 48 - 83	Engineering	20	20,000			187 max.
	Gray Iron castings is a major Consideration.	Gray
		25	25,000			170 - 229
		Gray
		30	30,000			187 - 241
		Gray
		35	35,000			207 - 255
		Gray
		40	40,000			217 - 269
ASTM	Automotive	Gray
A 159 - 83	Gray Iron	G1800	18,000			187 max.
	castings where	Gray
SAE J431	hardness is	G2500	25,000			170 - 229
	a major	Gray
	consideration.	G3000	30,000			187 - 241
		Gray
		G3500	35,000			207 - 255
		Gray
		G4000	40,000			217 - 269