High strength low carbon steel and method

Details High strength low carbon steel and method High strength low carbon steel and method

C - Chemistry, Metallurgy

22

C

75/147, 148/32

C22C 38/04 (2006.01) C22F 1/00 (2006.01)

Patent

CA 1063389

ABSTRACT OF THE DISCLOSURE Deep drawing steel is strengthened by alloy- nitrogen precipitation strengthening to a minimum average yield strength of 50 ksi. A deoxidized, low carbon steel sheet stock or article formed therefrom, containing from about 0.02% to 0.2% titanium in solution, from about 0.025% to 0.3% columbium in solution, from about 0.025% to about 0.3% zirconium in solution, alone or in admixture, is heat treated at 1100° - 1350°F in an atmosphere contain- ing ammonia in an amount insufficient, at the temperature and time involved, to permit formation of iron nitride.

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