PRODUCTION OF AS-ROLLED THIN STEEL SHEET FOR WORKING HAVING EXCELLENT RIDGING RESISTANCE AND CORROSION RESISTANCE

摘要

PURPOSE:To obtain a titled thin steel sheet having good workability with a new process without including cold rolling and recrystallization annealing by specifying rolling conditions in a stage for rolling a steel material having prescribed Fe purity to a prescribed sheet thickness. CONSTITUTION:The steel material contg. =99.50wt.% Fe is rolled in a temp. range of the Ar3 transformation point or below and =500 deg.C and at =35% draft and =300 s-1 strain rate in at least one pass in finish rolling in the stage of rolling said steel material to the prescribed thickness. The think steel sheet having the good workability and the excellent ridging resistance and corrosion resistance is thus obtd. as-rolled without executing not only the conventional cold rolling but also recrystallization annealing by the high draft and high strain rate rolling of the steel material having the above-mentioned compsn. in the above-mentioned temp. range.