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

摘要

PURPOSE:To obtain the titled thin steel sheet having good workability with a new process without including cold rolling and recrystallization annealing by specifying rolling conditions and coiling temp. in a stage for rolling a low carbon steel to a prescribed sheet thickness. CONSTITUTION:The low-carbon steel is rolled in the temp. range of the Ar3 transformation point or below and >=500 deg.C and at 35% draft and >=300s<-1> strain rate in at least one pass in finish rolling and is then taken up at <=400 deg.C in the stage of rolling the low-carbon steel to the prescribed sheet thickness. The thin steel sheet having the good workability as well as excellent ridging resistance and chemical convertibility 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 in the above-mentioned temp. range then coiling at the low temp.