| 摘要 |
Ferritic stainless steel with ductility, shock-resistance and corrosion resistance in neutral or weakly acid chloridized media; also the prodn. process for fabrication of this steel. The steel is characterised by the following chemical composn.: 28.5-35 wt.% chromium, 3.5-5.50 wt.% molybdenum, 0.5-2 wt.% copper, less than 0.50 wt.% nickel, less than 0.40 wt.% manganese, less than 0.40 wt.% silicon, less than 0.030 wt.% carbon, less than 0.030 wt.% nitrogen, at least 0.10 wt.% but less than 0.60 wt.% titanium and/or niobium, and up to 0.10 wt.% deoxidizing additives such as aluminium, magnesium, calcium, boron or rare earth metals. The remainder of the material is composed of iron and impurities. The steel is worked in strip form. The steel strip is hot-rolled with reheating to a temp. of 900-1200 deg.C, followed by being cold-rolled. After this there is an intermediate stage of heating to 900-1200 deg.C. before a second cold-rolling. Finally the steel is reheated a last time to 900-1200 deg.C. |
