发明名称 HIGH-STRENGTH STEEL SHEET AND PRODUCING METHOD THEREFOR
摘要 PROBLEM TO BE SOLVED: To provide a new low alloy, high strength steel sheet having both of the high strength and good workability, and a producing method therefor. SOLUTION: After annealing a rolled steel having specific chemical compositions to the temperature range of A1 to (Ac3+20)°C, this steel sheet is slowly cooled to the temperature range of A1 to (A1-100)°C at a cooling rate of≤10°C/sec and successively, and after rapidly cooling to near 500°C at a rate of≥60°C/sec, successively, this steel sheet is cooled to≤250°C at a cooling rate of 10 to 30°C/sec without keeping it at near 400°C, and thus, the high strength and excellent ductility with the low alloy composition at the same level as a composite structural steel sheet can be imparted to the steel sheet at the same time. COPYRIGHT: (C)2009,JPO&INPIT
申请公布号 JP2009173959(A) 申请公布日期 2009.08.06
申请号 JP20080010996 申请日期 2008.01.21
申请人 NAKAYAMA STEEL WORKS LTD 发明人 WAKITANI SOICHIRO;TAKESHI ICHIRO;AKISUE OSAMU
分类号 C22C38/00;B21B1/26;B21B3/00;C21D9/46;C22C38/58 主分类号 C22C38/00
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