Patent ID: 6911098
Filing Date: 2005-06-28
Classification: C21D,C22C

Abstract:
1. A cold-rolled ferritic stainless steel sheet comprising: about 0.01 percent by mass or less of carbon; about 1.0 percent by mass or less of silicon; about 1.5 percent by mass or less of manganese; about 11 to 23 percent by mass of chromium; about 0.06 percent by mass or less of phosphorous; about 0.03 percent by mass or less of sulfur; about 1.0 percent by mass or less of aluminum; about 0.04 percent by mass or less of nitrogen; about 0.0005 to 0.01 percent by mass of boron; 0.004 to about 0.3 percent by mass or less of vanadium; about 0.8 percent by mass or less of niobium and/or 1.0 percent by mass or less of titanium wherein 18≦Nb/(C+N)+2(Ti/(C+N))≦60; and the balance being iron and unavoidable impurities, wherein the average crystal grain diameter is about 40 μm or less and the average surface roughness is about 0.3 μm or less.