EQUIPMENT FOR CONTINUOUSLY CASTING AND HOT-ROLLING STAINLESS STEEL STRIP AND MANUFACTURE OF STAINLESS STEEL STRIP EXCELLENT IN SURFACE QUALITY

摘要

PURPOSE: To stably manufacture a hot rolled strip whose surface property and internal crystaline structure are good by arranging plural hot rolling mills and a cooling device on the downstream side of a continuous casting machine for thin slabs and hot-rolling the slab taking the total draft as a specified value. CONSTITUTION: The thin cast slab 2 of less than 3mm in thickness is cast with the continuous casting machine 1. The cast slab 2 is fed to the hot rolling mill 3a of the prestage with pinch rolls 7, 8. The cast slab 2 is rolled at the total draft of =60% in the temp. region of 900-1200 deg.C with the hot rolling mill 3a of the prestage and hot rolling mill 3b of the poststage. The strip 2s just after hot rolling is slowly cooled at the cooling rate of =5 deg.C/sec for 5-10sec with a cooling device 5. Next, after cooling the strip down to =600 deg.C at the cooling rate of =10 deg.C/sec, the strip is coiled with a coiler 9. By executing hot rolling at the draft of =60%, the hot rolled strip 2s having fine recrystallized grain size is manufactured.