Cold rolled steel sheet and method of making

Details Cold rolled steel sheet and method of making Cold rolled steel sheet and method of making

1997-09-23

2000-02-22

Yee, Deborah

Metal treatment

Stock

Ferrous

148541, 148603, 148547, 148623, 148624, C22C 3814, C21D 804

Patent

active

060275812

ABSTRACT:
Cold rolled steel sheet with excellent deep drawability and excellent anti-aging properties, and manufacturing method. The cold rolled steel sheet comprises about C: above 0.015 to 0.150 wt %, Si: 1.0 wt % or less, Mn: 0.01 to 1.50 wt %, P: 0.10 wt % or less, S: 0.003 to 0.050 wt %, Al: 0.001 to below 0.010 wt %, N: 0.0001 to 0.0050 wt %, Ti: 0.001 wt % or more and Ti(wt %)/[1.5.times.S(wt %)+3.4.times.N(wt %)].ltoreq.about 1.0 and B: about 0.0001 to 0.0050 wt %, during annealing, grain growth is improved; Ti is added to form a nitride and a sulfide to avoid precipitation of fine TiC; B is added to precipitate Boron precipitates (Fe.sub.2 B, Fex(C,B)y) in a cooling the hot rolled steel sheet and in cooling step during annealing after cold rolling; a spherical cementite is precipitated and grown in which the Boron series precipitate is a precipitation site.

REFERENCES:
patent: 4790885 (1988-12-01), Imagumbai et al.
patent: 5123969 (1992-06-01), Chou

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