发明名称 |
THREADED JOINT FOR PIPES HAVING A LUBRICATING COATING INCLUDING A TORQUE-AT-YIELD ENHANCING COMPONENT |
摘要 |
A lubricating coating which is free from harmful heavy metals is formed on a premium threaded joint for pipes constituted by a pin and a box each having a contact surface comprising a threaded portion and an unthreaded metal contact portion (a sealing surface and shoulder) in order to provide the joint with galling resistance, gas-tightness, and anticorrosive properties such that the unthreaded metal contact portion is prevented from yielding even when the joint is made up with a high torque. The lubricating coating comprises one or both of a rosin and calcium fluoride; metal soap; wax; and a basic metal salt of an aromatic organic acid, and preferably it further includes a lubricating powder, magnesium carbonate, and/or a carbohydrate, particularly a cyclodextrin.
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申请公布号 |
CA2703778(C) |
申请公布日期 |
2013.07.09 |
申请号 |
CA20082703778 |
申请日期 |
2008.10.31 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD.;VALLOUREC MANNESMANN OIL & GAS FRANCE |
发明人 |
GOTO, KUNIO;IMAI, RYUICHI;FUKUMOTO, SHIGEKI;YAMAMOTO, YASUHIRO |
分类号 |
C10M169/00;F16B33/06;F16L15/00 |
主分类号 |
C10M169/00 |
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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