High strength steel and process of making

Details High strength steel and process of making High strength steel and process of making

C - Chemistry, Metallurgy

22

C

75/152, 148/50

C22C 38/06 (2006.01) C21D 9/46 (2006.01)

Patent

CA 1118619

Abstract of the Disclosure A novel high strength steel especially adapted for automotive applications and the like is provided by cold rolling a low carbon aluminum-killed steel containing added phosphorus and silicon as ferrite strengtheners, continuously heating the cold rolled strip to an inter-crticial temperature such that from about 5% to about 25% austenite is present, water quenching to obtain a dual phase ferrite-martensite microstructure having an average volume fraction of martensite of from about 5% to about 25%, and reheating to a sub-critical temperature to temper the steel. The resultant steel has good formability as evidenced by a minimum total elongation of 18%, is free from ductility loss due to room temperature aging, and after stamping followed by a typical paint bake cycle the formed part has a minimum yield strength of 550 MPa (80 ksi).

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