发明名称 |
Threaded joint for steel pipes |
摘要 |
A threaded joint for steel pipes comprised of a pin (1) and a box (2) each having a threaded portion (1a, 2b) and an unthreaded contact portion (1b, 2a) exhibits adequate leakage resistance and galling resistance when used for makeup of oil country tubular goods with application of a green dope or even without any dope. The threaded joint has a first plating layer of Sn—Bi—Cu alloy plating formed on the contact surface of at least one of the pin (1) or the box (2). The first plating layer may have a second plating layer selected from Sn plating, Cu plating, and Ni plating on its lower side and at least one layer of a lubricating coating, and particularly a solid lubricating coating on its upper side.
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申请公布号 |
US7740285(B2) |
申请公布日期 |
2010.06.22 |
申请号 |
US20080073077 |
申请日期 |
2008.02.29 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD.;VALLOUREC MANNESMANN OIL & GAS FRANCE |
发明人 |
NAGASAKU SHIGEO;GOTO KUNIO;ONISHI SHIGEO;IKEGAMI HIROAKI |
分类号 |
F16L15/00;B32B15/01;C21D8/10 |
主分类号 |
F16L15/00 |
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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