发明名称 |
PROCESS FOR PRODUCING STEEL MATERIAL |
摘要 |
<p>A process for producing a steel material which includes 30-minute or longer holding at the pearlite nose transformation completion point. In the process for steel material production, process annealing (3) is conducted between preceding-step hot working (1) and subsequent-step hot working. In the process annealing (3), a semi-product steel material (4) after completion of the preceding-step hot working is introduced into a heat-maintaining tank (7) to cause the steel material to recuperate heat and the semi-product steel material is kept for 30 minutes or longer at a temperature in the range of (pearlite nose transformation completion point) ±20°C by means of the transformation latent heat thereof to thereby transform the semi-product steel material into pearlite. Preferably, the semi-product steel material introduced into the heat-maintaining tank is kept for 2 hours or longer at a temperature in the range of (pearlite nose transformation completion point) ±20°C. The steel material can be regulated so as to have a hardness after the process annealing of 300 HB or lower.</p> |
申请公布号 |
EP2006398(A1) |
申请公布日期 |
2008.12.24 |
申请号 |
EP20070741346 |
申请日期 |
2007.04.10 |
申请人 |
HITACHI METALS, LIMITED |
发明人 |
KATAOKA, HITOSHI;EGUCHI, HIROTAKA |
分类号 |
C21D9/00;C21D1/26;C21D6/00;C21D8/02;C22C38/00;C22C38/02;C22C38/04;C22C38/22;C22C38/24;C22C38/58 |
主分类号 |
C21D9/00 |
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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