发明名称 |
A COLD ROLLED DUAL-PHASE STRUCTURE STEEL SHEET HAVING AN EXCELLENT DEEP DRAWABILITY AND A METHOD OF MANUFACTURING THE SAME |
摘要 |
A cold rolled dual-phase structure steel sheet having an excellent deep drawability is disclosed, which consists of ferrite phase and low temperature transformation product phase and comprises 0.001-0.008 wt % of C, not more than 1.0 wt % of Si, 0.05-1.8 wt % of Mn, not more than 0.15 wt % of P, 0.01-0.10 wt % of Al, 0.002-0.050 wt % of Nb and 0.0005-0.0050 wt % of B provided that the value of Nb (%)+10B (%) is in a range of 0.010-0.080%, and, if necessary, 0.05-1.00 wt % of Cr and the balance being substantially Fe with inevitable impurities. This steel sheet is manufactured by hot and cold rolling a steel slab with the above chemical composition and continuously annealing the resulting steel sheet in such a manner than the steel sheet is heated and soaked at a temperature from alpha -> gamma transformation point to 1,000 DEG C. and then cooled at an average cooling rate of not less than 0.5 DEG C./sec but less than 20 DEG C./sec in a temperature range of from the soaking temperature to 750 DEG C., and subsequently at an average cooling rate of not less than 20 DEG C./sec in a temperature range of from 750 DEG C. to not more than 300 DEG C. |
申请公布号 |
DE3468906(D1) |
申请公布日期 |
1988.02.25 |
申请号 |
DE19843468906 |
申请日期 |
1984.03.16 |
申请人 |
KAWASAKI STEEL CORPORATION |
发明人 |
SATOH, SUSUMU C/O RESEARCH LABORATORIES;SIZUKI, HIDEO C/O RESEARCH LABORATORIES;OBARA, TAKASHI C/O RESEARCH LABORATORIES;NISHIDA, MINORU C/O RESEARCH LABORATORIES;HASHIMOTO, OSAMU C/O RESEARCH LABORATORIES |
分类号 |
C22C38/00;C21D8/02;C21D8/04;C21D9/48;C21D9/52;C22C38/06;C22C38/12;C22C38/32;(IPC1-7):C22C38/12 |
主分类号 |
C22C38/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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