发明名称 |
THREADED JOINT FOR STEEL TUBE |
摘要 |
A threaded joint for steel pipes which is capable of metal-to-metal sealing and which can be subjected to repeated fastening and unfastening without the application of a liquid lubricant containing a heavy metal powder comprises a pin and a box each having a contact surface including a threaded portion and an unthreaded metal contact portion. The contact surface of at least one of the pin and the box are coated with an undercoating layer and a lubricating coating layer atop it. The undercoating layer is a porous metal coating having a porosity of 5 - 80% and a thickness of 1- 30 .mu.m and preferably a hardness of 50 - 250 Hv. The lubricating coating is a solid lubricating coating or a liquid lubricating coating, the latter containing substantially no heavy metal powders. The total thickness of the undercoating layer and the lubricating coating layer is at most 100 .mu.m.
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申请公布号 |
CA2454336(C) |
申请公布日期 |
2008.10.07 |
申请号 |
CA20022454336 |
申请日期 |
2002.07.19 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD. |
发明人 |
GOTO, KUNIO;MATSUMOTO, KEISHI;ANRAKU, TOSHIRO;NAGASAKU, SHIGEO |
分类号 |
F16L15/00;F16L15/04;C10M109/02;C10M159/24;C10M169/04;C10M171/00;C23C4/04;C25D15/02 |
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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