Ferrite stainless steel sheet having less planar anisotropy...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/22 (2006.01) C21D 8/00 (2006.01) C21D 8/04 (2006.01) C22C 38/28 (2006.01)

Patent

CA 2186582

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% (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 Ti/(C + N) 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°C. The hot rolled sheet is subsequently annealed, cold rolled, and finish annealed.

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