CONTINUOUSLY CAST SLAB FOR STEEL SHEET AND METHOD FOR PRODUCING THE SAME, AND STEEL SHEET AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a slab for steel sheet in which press cracking caused by large-sized inclusions is hard to occur, to provide a method for producing the same, a steel sheet, and a method for producing the same.;SOLUTION: The composition of inclusions in a continuously cast slab is controlled to the following, and then rolling is performed at a draft of ≥150: 80≤Ti oxide(%)+REM oxide(%)+Al₂O₃(%); CaO(%)≤5; 10≤Ti oxide(%); 15≤Al₂O₃(%)≤70; and 5≤REM oxide(%)≤0.31×Al₂O₃(%)+15. By this method, the steel sheet in which press cracking caused by large-sized nonmetallic inclusions upon press working is hard to occur can be obtained.;COPYRIGHT: (C)2007,JPO&INPIT