发明名称 |
Tubular threaded joint having improved high torque performance |
摘要 |
A lubricating coating which can prevent the occurrence of galling even when makeup is carried out with a high torque and which has excellent rust preventing properties is formed on the contact surfaces of a pin and/or a box of a tubular threaded joint. The lubricating coating contains copolymer particles made from particles of an acrylic-silicone copolymer with an average particle diameter of 10-50 μm dispersed in a highly viscous matrix made from a mixture of a rosin-based substance selected from rosin and its derivatives, wax, a metal soap, and a basic metal salt of an aromatic organic acid (such as highly basic Ca sulfonate). |
申请公布号 |
US8991870(B2) |
申请公布日期 |
2015.03.31 |
申请号 |
US201113881440 |
申请日期 |
2011.11.04 |
申请人 |
Nippon Steel & Sumitomo Metal Corporation;Vallourec Oil and Gas France |
发明人 |
Goto Kunio;Yamamoto Yasuhiro |
分类号 |
F16L7/00;F16L9/00;F16L11/00;F16L21/00;F16L15/06;C10M169/04;F16L15/00;F16L15/08;B05D3/00;B05D3/06 |
主分类号 |
F16L7/00 |
代理机构 |
Clark & Brody |
代理人 |
Clark & Brody |
主权项 |
1. A tubular threaded joint comprising a pin and a box each having contact surface including threads and an unthreaded metal contact portion, characterized in that the contact surface of at least one of the pin and the box has a lubricating coating comprising particles of a copolymer of a resin selected from a silicone resin and a fluorocarbon resin with a thermoplastic resin, said particles being dispersed in a viscous matrix having a complex shear viscosity of at least 3000 Pa-sec at 25° C. |
地址 |
Tokyo JP |