ASTM A/AM Standard Specification for Steel Castings, Carbon, Low Alloy, and ASTM StandardsA/AM Specification for Steel Castings, Carbon, Low Alloy, and Stainless Steel, Heavy-Walled for Steam Tur-bines A Test Methods and A (7SiMg) Aluminum Alloy AMS,,,,, A Former ASTM., SG70A; A, SG70B SAEJ, Standard Specification for. Steel Castings, Carbon, Low Alloy, and Stainless Steel, Heavy-Walled for Steam TurbinesThis standard is issued under the fixed designation A /A M; the number immediately following