Gray Iron

					Minimum
Specifing	Spec.	Typical	Class or	Test	Tensile	Heat	Other
Body:	Number:	Use:	Grade:	Bar	Strength	Treatment:	Requirements:
				Dia."	PSI:
ASTM	A 48-03		30-B	1.2	30		When agreed upon
							in writing, special
			30-C	2	30		requirements can be met
		General engineering					such as hardness,
		use where tensile	40-B	1.2	40		chemical composition
		strength is a major					and microstructure.
		consideration.	40-C	2	40		Any class or grade
							castings can
			50-B	1.2	50	Normalized or	be stress relieved
						Quenched and	to help maintain
						Tempered	dimensional integrity.

Ref. ASTM Book of Standards, Ferrous Castings: Ferroalloys,					Most common grades poured at Oil City.
Section 1, Volume 01.02 for additional data.