公开(公告)号：EP2650396A4

公开(公告)日：2014-07-23

申请号：EP11847252

申请日：2011-12-05

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： TORISU KEIICHIRO ,  TANAKA SEIICHI ,  YOKOYA HIROKAZU ,  MATSUNAGA JYUNICHI

IPC分类号： C22C38/06 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C21D9/48 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/60

CPC分类号： C21D8/0263 ,  B65D83/38 ,  C21D8/0226 ,  C21D8/04 ,  C21D8/0405 ,  C21D8/0447 ,  C21D9/46 ,  C21D9/48 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

摘要： A steel sheet for bottom covers of aerosol cans includes, as chemical composition, C: 0.025 to 0.065mass%, Mn: 0.10 to 0.28mass%, P: 0.005 to 0.03mass%, Al: 0.01 to 0.04mass%, N: 0.0075 to 0.013mass%, Si: limited to 0.05mass% or less, S: limited to 0.009mass% or less, and balance consisting of Fe and unavoidable impurities, wherein yield point YP in rolling direction after aging treatment is in range of 460 to 540 MPa, total elongation in the rolling direction after the aging treatment is 15% or more, yield point elongation EL YP in the rolling direction after the aging treatment is 6% or less, and sheet thickness t in unit of mm, the yield point YP in unit of MPa in the rolling direction after the aging treatment, and the yield point elongation EL YP in unit of % in the rolling direction after the aging treatment satisfy 130‰¤t×YP×(1-EL YP /100).