Process for producing hot-rolled steel sheet having high r value

Details Process for producing hot-rolled steel sheet having high r value Process for producing hot-rolled steel sheet having high r value

1987-02-06

1988-09-06

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 12C, C21D 802

Patent

active

047690887

ABSTRACT:
An r value of a hot-rolled steel sheet is enhanced by: a specific composition consisting of not more than 0.015 wt % of C, from 1.0 to 2.5 wt % of Mn, from 0.005 to 0.10 wt % of Al, from 0.01 to 0.06 wt % of Nb, from 0.01 to 0.1 wt % of Ti; and, controlled rolling, characterized by in the rough rolling, imparting, in a temperature range of from 980.degree. to 1100.degree. C., a heavy reduction of not less than 20% per pass to the steel sheet; completing a finishing rolling at from Ar.sub.3 to 930.degree. C. and maintaining a total reduction at a temperature of not more than Ar.sub.3 +150.degree. C. to not less than 90%; and, coiling at a temperature of from 600.degree. to 800.degree. C.

REFERENCES:
patent: 3849209 (1974-11-01), Ishizaki et al.

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