PRODUCTION OF AUSTENTIC STAINLESS STEEL PLATE HAVING UNIFORM GLOSS SURFACE

摘要

PROBLEM TO BE SOLVED: To obtain uniform gloss surface without executing grinding polish by heating a cast slab obtd. with a continuous casting to a specific temp. range, and by further applying hot-rolling and controlling concn. distribution in the width direction of δ-ferritic phase. ;SOLUTION: After heating a cast slab obtd. with a continuous casting to a temp. range 1300≥SRT≥1150°C, hot-rolling is applied. Then, the following condition is obtained: SRT≥(15×δ-ferrite_cal)+1090°C and δ-ferrite_cal=3.2(Cr+1.5 Si+0.5Nb+0.5Ti)-2.5(Ni+0.5Mn+0.3Cu+30C+30N)-24.7, wherein, SRT(°C) is the cast slab temp. before hot-rolling, δ-ferrite_cal is concn. (vol.%) of the δ-ferritic phase calculated from the composition of the cast slab, while the content of each component element is expressed in wt.%. Further, the gradient per unit distance in the concn. distribution in the width direction of the δ-ferritic phase existing below the surface scale of the cast slab is made to be ≤4 (vol.%/ cm).;COPYRIGHT: (C)1999,JPO