QQ-S-631A, FEDERAL SPECIFICATION: STEEL, BAR, CARBON, HOT ROLLED (SPECIAL QUALITY) (15 JUN 1971) [S/S BY ASTM A576 & A675]

QQ-S-631A, FEDERAL SPECIFICATION: STEEL, BAR, CARBON, HOT ROLLED (SPECIAL QUALITY) (15 JUN 1971) [S/S BY ASTM A576 & A675]., This specification covers special quality hot rolled carbon bars for general fabrication purposes (see 6.1). It does not cover the free machining or leaded carbon” stEel hot rolled bars (see 6.4) .