<p>A solid lubricating coating formed on a contact surface of a threaded joint for pipes has a matrix of a lubricating oil-containing polymer. The lubricating oil-containing polymer has either a uniform composition or a gradient composition in which the concentration of lubricating oil decreases towards the contact surface and in which there is substantially no lubricating oil in the vicinity of the contact surface.</p>
申请公布号
EP2414718(B1)
申请公布日期
2014.03.26
申请号
EP20100758929
申请日期
2010.03.31
申请人
NIPPON STEEL & SUMITOMO METAL CORPORATION;VALLOUREC OIL AND GAS FRANCE