| 摘要 |
PURPOSE:To obtain stably a steel strip having both of superior corrosion resistance and high ductility even in a hot rolled state, by hot rolling a steel having a specified compsn. in which C, P, S, etc. are restricted, then cooling rapidly to remarkably low temp. range and winding said plate, further specifying the temp. of hot rolling completion and cooling time thereafter. CONSTITUTION:The steel consisting of, by wt%, <=0.05 C, <=2.0 Si, <=2.0 Mn, <=0.03 P, <=0.015 S, 16.0-30.0 Cr, 3.0-9.0 Ni, 0.2-5.0 Mo, <=0.45 N, if necessary further >=one kind among <=0.05 solAl, <=0.0100 Ca, <=0.10 rare earth element, <=0.10 Zr, <=2.0 Cu, <=0.05 Nb, <=0.05 V, <=0.05 Ti and the balance Fe is hot rolled. The hot rolling is finished at >=825 deg.C, then said plate is air cooled in 5- 20sec, successively cooled rapidly at >=5 deg.C/sec rate, and wound at <=550 deg.C temp. range. |
