Method of producing cold rolled steel sheets for deep drawing

Details Method of producing cold rolled steel sheets for deep drawing Method of producing cold rolled steel sheets for deep drawing

C - Chemistry, Metallurgy

21

D

148/34.4

C21D 8/04 (2006.01)

Patent

CA 1216499

Abstract of the Disclosure The present invention relates to a method of producing a cold rolled steel sheet for deep drawing. In order to improve the deep drawability (r-value), ductility (yield strength and elongation E?) and the like of ultra-low carbon aluminum killed steel, the chemical composition (% by weight) of the steel is adjusted such that the steel contains C : ?0. 015%, Mn : ?0.4%, P : ?0.03%, sol. A? : 0.005-0.100%, N : ?0.010%, Ti (exclusive of Ti present in the form of oxide) : in an amount satisfying a formula of Image the hot rolling of the steel slab is effected at a soaking temperature lower than 1,100°C and at a finishing temperature of 600-780°C. As illustrated in the drawings, a low temperature rolling can be carried out, and the resulting cold rolled steel sheet is excellent in the deep drawability and ductility and further excellent in the treatable property of the surface and in the surface property. Therefore, the cold rolled steel sheet is particularly suitable for the production of automotive exterior plate.

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