发明公开
EP2489754A3 Hollow drilling steel rod and method of manufacturing the same
有权
中空Stahlbohrgestänge及其制造方法
- 专利标题： Hollow drilling steel rod and method of manufacturing the same
- 专利标题（中）： 中空Stahlbohrgestänge及其制造方法
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申请号： EP12001073.1申请日： 2012-02-17
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公开(公告)号： EP2489754A3公开(公告)日： 2013-01-23
- 发明人: Hisada, Masaya , Hiwasa, Yoneo , Nagase, Satoshi , Takahata, Noritaka
- 申请人： Mitsubishi Materials Corporation , Daido Steel Co.,Ltd.
- 申请人地址： 3-2, Otemachi 1-chome Chiyoda-ku Tokyo JP
- 专利权人： Mitsubishi Materials Corporation,Daido Steel Co.,Ltd.
- 当前专利权人： Mitsubishi Materials Corporation,Daido Steel Co.,Ltd.
- 当前专利权人地址： 3-2, Otemachi 1-chome Chiyoda-ku Tokyo JP
- 代理机构： Diehl & Partner GbR
- 优先权： JP2011033941 20110218
- 主分类号： C22C38/02
- IPC分类号： C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/42 ; C22C38/44 ; C22C38/50 ; C22C38/54 ; E21B17/00 ; C21D1/18 ; C21D9/08
摘要：
The present invention relates to a hollow drilling steel rod including a stem portion and a thread portion positioned at an end portion in an axial direction with respect to the stem portion, the hollow drilling steel rod being constituted of a steel having a specific composition described in the present specification, in which the thread portion includes a thread having been subjected to a high frequency quenching, and the thread portion and the stem portion separate from each other have been joined by a friction welding.
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