发明名称 |
Heat treatment method for producing boundary-layer hardened long products and flat products of unalloyed or low-alloy steel |
摘要 |
In a heat treatment method for producing boundary layer-hardened long products and flat products of unalloyed or low-alloy steel, the workpiece is cooled for producing a martensitic grain within a boundary layer of the workpiece by repeating several sequential cooling process steps. Each sequential cooling process step has a cooling phase, in which the workpiece is cooled to a temperature below a martensite starting temperature for martensitic conversion of only a portion of the boundary layer of the workpiece, and a temporal stress-relief phase for relieving stress within already formed martensitic grain areas and already formed martensite/austenite boundary areas. Subsequently, the workpiece is cooled at a cooling rate below a lower critical cooling rate for cooling the workpiece core.
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申请公布号 |
US6355119(B1) |
申请公布日期 |
2002.03.12 |
申请号 |
US20000566206 |
申请日期 |
2000.05.05 |
申请人 |
SMS SCHLOEMANN-SIEMAG AKTIENGESELLSCHAFT |
发明人 |
PETERS ANDREAS;MEYER MEINERT |
分类号 |
C21D6/00;C21D1/02;C21D1/06;C21D1/19;C21D8/08;C21D9/00;(IPC1-7):C22C38/00;C21D8/00 |
主分类号 |
C21D6/00 |
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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