| 摘要 |
PURPOSE:To manufacture inexpensively a thin sheet of clad steel excellent in quality by subjecting clad slab consisting of stainless steel or the like and ultralow-carbon steel to the suitable hot rolling and cold rolling and thereafter performing the heat-treatment holding it soakingly in the suitable conditions. CONSTITUTION:.The following clad slab is heated and thereafter hot-rolled wherein both a ply material such as stainless steel, nickel and nickel-based alloy and a base material of ultralow-carbon steel of <=0.015% C contg. no fixed element of carbon and nitrogen are clad in two or three layers and wound at 600-750 deg.C temp. immediately after finishing the hot rolling at the temp. of <=50 deg.C more than the transformation point A3 of the above-mentioned base material. Thereafter the cold rolling is performed and it is held soakingly with an annealing furnace in the conditions within the range surrounded by the lines binding a point A (900 deg.C, 5sec), a point B (850 deg.C, 5sec), a point C (810 deg.C, 15sec), a point D (810 deg.C, 30sec) and a point E (900 deg.C, 20sec) shown in a figure and thereafter cooled. The thin sheet of clad steel wherein the surface roughening is not caused is obtained at a low cost by the above-mentioned heat-treatment. |
