Patent ID: 6521056
Filing Date: 2003-02-18
Classification: C21D,C22C

Abstract:
A ferritic stainless steel sheet having superior workability at room temperatures and mechanical characteristics at high temperatures, wherein said stainless steel sheet has a composition containing, by weight percent,C: not more than 0.02%, Si: 0.2 to 1.0%, Mn: not more than 1.5%, Cr: 11.0 to 20.0%, Ni: 0.05 to 2.0%, Mo: 1.0 to 2.0%, l: not more than 1.0%, Nb: 0.2 to 0.8%, and N: not more than 0.02%, balance essentially Fe, and an aspect ratio (dRD/dTD) of grain size in planes at Â¼ and Â¾ sheet thickness, seen in a direction normal to a sheet surface, that satisfies the following equation:1.03&lE;(dRD/dTD)&lE;1.35 where dRD: average grain size in a rolling direction (RD direction) seen in a direction normal to the sheet surface, anddTD: average grain size in a transverse direction (TD direction) perpendicular to the RD direction seen in a direction normal to the sheet surface.