ASTM A48/A48M-00 pdf free.Standard Specification for Gray Iron Castings. ASTM A48/A48M covers gray iron castings intended for general engineering use where tensile strength is a major consideration. Castings are classified on the basis of the tensile strength of the iron in separately cast test bars. 1.1.1 This specification subordinates chemical composition to tensile strength. 4. Classification 4.1 Castings ordered and...