FORMABLE HIGH STRENGTH LOW ALLOY STEEL

摘要

C-2653 A-21, 514 FORMABLE HIGH STRENGTH LOW ALLOY STEEL The formability of high strength low alloy steel is improved while strength is substantially maintained or improved by first heating the steel to at least the lowermost eutectoid temperature of the alloy constituents to dissolve a substantial proportion into the austenite and air cooling to substantially lower the yield strength and improve formability without significantly reducing tensile strength. The steel is then deformed to an amount equivalent to at least 2% strain on the tensile stress-strain diagram whereby the yield strength is substantially recovered and then heat aged whereby the yield strength and tensile strength are each further raised.