| 摘要 |
PURPOSE:To obtain a stainless steel for coloring having uniform surface potential by cold-rolling austenitic stainless steel, and subjecting the cold-rolled steel plate to bright annealing in a gaseous atmosphere of specified compsns. of N2/H2 under controlled dew point of the atmosphere gas. CONSTITUTION:After cold rolling of austenitic stainless steel, said steel is subjected to bright annealing at 800-1,200 deg.C in a gaseous atmosphere contg. 1/1- 1/3 N2/H2. Here the steel plate is subjected to the bright annealing for a specified time while the compsns. and temp. of the atmosphere gases are maintained respectively constant within the above-mentioned ranges. Further the dew point of the atmosphere gases during the annealing is controlled to + or -3 deg.C in a -35- -65 deg.C range. By this method the components of the surface layer of the steel plate are made uniform, the surface potential is made uniform and the stainless steel for coloring free from generation of uneven coloring in chemical coloring is obtained. |
