COLD ROLLING METHOD OF THIN STAINLESS-STEEL SHEET WITH LESS SURFACE DEFECT AND EXCELLENT RESISTANCE TO CORROSION

摘要

PURPOSE:To manufacture a thin stainless steel sheet excellent in surface properties by using specific large and small diameter rolls for the purpose of changing a rolling reduction in cold rolling a stainless steel sheet. CONSTITUTION:In manufacturing a thin sheet material by cold rolling a stainless steel sheet, the cold rolling of a =50% of the total rolling reduction is first performed by using a large-diameter roll having a =0.5mum average roughness (Ra) at the center line and a =150mm.phi diam. Successively, the cold rolling of a =10% of the total rolling reduction at boundary lubricating conditions, is performed by using a small diam. roll having a =0.2mum average roughness (Ra) at the centerline and a =100mm.phi diam. Thus, a thin stainless steel sheet, having surface properties equal to or more excellent than those of a sheet rolled by a convertional Sendzimir rolling mill, can be manufactured even the coil-surface planing process of a stainless steel sheet before cold rolling is eliminated.