| 摘要 |
PURPOSE:To produce a stainless steel sheet excellent in workability at a low cost by applying cold rolling to a cast strip of a Cr-Ni stainless steel in which the total content of Ti, Nb, etc., are controlled and subjecting the resulting sheet to final annealing and then to temper rolling at specific rolling reduction. CONSTITUTION:The total content of Ti, Nb, Zr, Al, and REM in a molten Cr-Ni stainless steel, such as 18%Cr-8%Ni steel, is regulated to <=0.05%, and this molten steel is formed into a cast strip of <=6mm thickness by a continuous casting process where a mold is moved synchronously with a cast strip. At this time, the molten steel is cast into a foil-like strip at >=100 deg.C/sec solidification and cooling rate. This cast strip is coiled without hot rolling and pickled and then cold-rolled. The resulting cold rolled sheet is subjected to final annealing where pickling is exerted after annealing or to final annealing by means of bright annealing. Then, temper rolling is applied to the steel sheet at 0.5-1.5% rolling reduction to form a sheet product. By this method, the Cr-Ni stainless steel sheet having superior surface quality and material quality, such as elongation, and excellent in workability can be obtained with superior productivity at a low cost. |
