High strength ductile hot rolled nitrogenized steel

Details High strength ductile hot rolled nitrogenized steel High strength ductile hot rolled nitrogenized steel

1974-12-02

1976-01-06

Stallard, W.

Metal treatment

Compositions

Heat treating

148 12F, C21D 602, C21D 946

Patent

active

039309070

ABSTRACT:
Aging hot rolled nitrogenized low carbon steel is treated to produce a material having a level of ductility during forming and a yield strength after forming which is comparable to the 80,000 psi yield strength hot rolled low alloy (HSLA) steels. The method includes the steps of (1) rapidly heating the steel within the alpha plus gamma region of the appropriate phase diagram for the steel and quenching; (2) tempering for example at about 400.degree.F. for about 2 minutes and cooling; (3) deforming at least 2 percent, and (4) aging to develop the 80,000 psi yield strength.

REFERENCES:
patent: 3330705 (1967-07-01), Madrzyk et al.
patent: 3625780 (1971-12-01), Bosch et al.
patent: 3788903 (1974-01-01), Suzuki et al.

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