QQ-S-681F, FEDERAL SPECIFICATION: STEEL CASTINGS (29 AUG 1974) [S/S BY ASTM A27 AND ASTM A148]

QQ-S-681F, FEDERAL SPECIFICATION: STEEL CASTINGS (29 AUG 1974) [S/S BY ASTM A27 AND ASTM A148]., This specification covers mild-to-medium-strength carbon steel castings for general application as described in ASTM A 27 and high-strength steel castings for structural purposes as described in ASTM A 148.