Nippon Steel Corporation

Kazuo Namba

Hiroshi Takechi

Hisashi Gondo

Hiroaki Masui

Mitsunobu Abe

Kunihiko Komiya

Koji Ozaki

A process of producing a cold rolled killed steel sheet with good cold formabilities particularly by continuous-annealing, and more particularly to a process of producing cold rolled steel sheet and strip having particularly enhanced deep drawability by controlling the chemical composition and compositional proportions of the killed steel as well as the high temperature coiling after a hot rolling operation.

Process for producing cold rolled steel sheet and strip having improved

A method for producing a cold rolled steel sheet having high strength and stretchability which comprises hot rolling a steel containing 0.03 to 0.30% C, less than 0.7% Si, 0.6 to 2.5% Mn, 0.01 to 0.20% sol.Al, not more than 0.015% O with the balance being Fe and unavoidable impurities, cold rolling with a reduction not less than 30%, heating with an average heating rate not less than 3.degree.C/sec. annealing in a temperature range from 650.degree.C to A.sub.3 transformation point for 1 to 15 minutes, and cooling with an average cooling rate of 0.5.degree. to 30.degree.C/sec. down to 500.degree.C.

Method for producing a high-strength cold rolled steel sheet having

A method for producing a high-strength cold rolled steel sheet or strip is disclosed. Steel comprising

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Kisarazu, Japan

Kazuo Namba