| 摘要 |
<p>Ferritic stainless steel sheet composition comprises (in wt.%) carbon (= 0.03), manganese (= 1), silicon (0.3-1), sulfur (= 0.01), phosphorous (/~0.04), chromium (18-22), nickel (= 0.5), molybdenum (= 2.5), copper (= 0.5), titanium (= 0.02), zirconium (= 0.02), aluminum (= 0.02), niobium (0.2-1), vanadium (0.2), nitrogen (= 0.03), cobalt (0.005-0.05), tin (= 0.05), in which the sum of titanium, aluminum and zirconium is = 0.03 wt.% and the rest of the composition is constituted by iron and unavoidable impurities resulting from the development. Ferritic stainless steel sheet composition comprises (in wt.%) carbon (= 0.03), manganese (= 1), silicon (0.3-1), sulfur (= 0.01), phosphorous (/~0.04), chromium (18-22), nickel (= 0.5), molybdenum (= 2.5), copper (= 0.5), titanium (= 0.02), zirconium (= 0.02), aluminum (= 0.02), niobium (0.2-1), vanadium (0.2), nitrogen (= 0.03), cobalt (0.005-0.05), tin (= 0.05), in which the sum of titanium, aluminum and zirconium is = 0.03 wt.% the contents of chromium, silicon, molybdenum, niobium, carbon, nitrogen, vanadium and titanium satisfy the formula given in the specification and the rest of the composition is constituted by iron and unavoidable impurities resulting from the development. Independent claims are included for: (1) preparation of the ferritic stainless steel sheet, comprising supplying the steel composition, proceeds casting semi-finished product from the steel, raising the temperature of the semi-finished product to greater than 1000[deg] C, hot roll of the semi-finished product to obtain a hot rolled sheet, cold roll of the sheet and reheating the cold rolled sheet at 1030-1130[deg] C for 10 seconds to 3 minutes, to obtain a structure completely recristallized with a ferritic particle grain size of 10-60 mu m; and (2) preparation of a part comprising providing the stainless ferritic steel sheet, shaping the sheet to obtain the part and subjecting the part to thermal cycles at 650-1050[deg] C for higher than 30 minutes.</p> |
