Ferrite stainless steel sheet having less planar anisotropy and

Details Ferrite stainless steel sheet having less planar anisotropy and Ferrite stainless steel sheet having less planar anisotropy and

1996-09-24

1998-12-22

Zimmerman, John J.

Metal treatment

Stock

Ferrous

148320, 148579, 148605, 428544, 420121, 420 64, C22C 3800, C22C 3818, C22C 3822, C22C 3832

Patent

active

058513167

ABSTRACT:
A ferritic stainless steel sheet having less planar anisotropy and excellent anti-ridging characteristics is disclosed. The sheet includes not more than about 0.02 wt % of C, about 0.01-1.0 wt % of Si, about 0.01-1.0 wt % of Mn, not more than about 0.08 wt % of P, not more than about 0.01 wt % of S, about 0.005-0.30 wt % of Al, about 11-50 wt % of Cr, about 0.1-5.0 wt % of Mo, not more than about 0.03 wt % N, with the contents of C and N satisfying the relations: about 0.005 wt %.ltoreq.(C+N)<about 0.03 wt %, and (C/N)<about 0.6. The sheet also includes Ti in an amount to satisfy the relation: about 5.ltoreq.Ti/(C+N).ltoreq.about 30. The balance of the sheet includes Fe and incidental impurities, with the sheet having an X-ray integral intensity ratio (222)/(310) of not less than about 35 in a plane parallel to a sheet surface at a depth of 1/4 of the sheet thickness from the sheet surface. This ferritic stainless steel sheet may be produced by a method which includes hot rolling said steel having the above-described composition at a final pass reduction ratio during rough rolling of not less than about 40% and at a final finish rolling temperature of not more than about 750.degree. C. The hot rolled sheet is subsequently annealed, cold rolled, and finish annealed.

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