| 摘要 |
PURPOSE: To obtain a thin steel sheet excellent in the surface quality without uneven luster by applying hot-rolling having a specific rolling ratio to a cast slab which is cast by a synchronous type continuous casting process using cooling rolls having dimples and specifies the componental composition. CONSTITUTION: The austenitic stainless steel having component composition satisfying the inequality: Ni equivalence <=0.63×Cr equivalence -1.29 to the Cr equivalence defined with Cr+Mo+1.5Si and the Ni equivalence defined with Ni+30 (C+N)+0.5 (Mn+Cu) by wt.% in all elements, is cast with a continuous caster, such as twin rolls, synchronously moving the cast slab with the wall surface of the cooling rolls and randomly dispersing many dimples by a shot blasting method. Successively, the dimples transferred onto the cast slab is rolled and disappeared by the hot-rolling having >=10% reduction ratio and also, the thin sheet forming equi-axed crystal grain by recrystallizing the surface layer is coiled. The uneven luster caused by the remainingδ-ferrite is not at all developed by the limitation of the components in the cast slab.
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