发明名称 |
Steel workpiece oil quenching method |
摘要 |
A steel workpiece maintained at a specified quenching temperature is rapidly cooled to a temperature just above the martensite transformation start point (Ms point) by being immersed in a high-temperature quenching oil. Thereafter, the steel workpiece is taken out of the high-temperature quenching oil so as to be soaked by the heat possessed by the steel workpiece and subsequently cooled by being immersed in the high-temperature quenching oil. Through these processes, a temperature difference between steel workpieces or the portions of a steel workpiece in the martensite transformation stage is reduced, and a cooling speed in a high-temperature region (not lower than about 550° C.) is made to be a slow speed sufficient for restraining a thermal distortion, by which the quenching distortion and quenching variation can be reduced.
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申请公布号 |
US2002166610(A1) |
申请公布日期 |
2002.11.14 |
申请号 |
US20020067202 |
申请日期 |
2002.02.07 |
申请人 |
SHIMOSATO YOSHIKAZU;OGAWA SABURO;MIYAMOTO KIYOHIRO |
发明人 |
SHIMOSATO YOSHIKAZU;OGAWA SABURO;MIYAMOTO KIYOHIRO |
分类号 |
C21D1/20;C21D1/58;(IPC1-7):C21D1/58;C21D1/60 |
主分类号 |
C21D1/20 |
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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