发明名称 |
Tubular threaded joint having improved low temperature performance |
摘要 |
In order to provide a tubular threaded joint constituted by a pin and a box each having threads and an unthreaded metal contact portion with excellent galling resistance and gas tightness even in extremely cold environments at −60° C. to −20° C. and rust preventing properties without using a compound grease, a thermoplastic solid lubricating coating containing low friction copolymer particles made from an acrylic-silicone copolymer and preferably further containing a solid lubricant (e.g., graphite) in a thermoplastic polymer matrix (e.g., selected from polyolefin resins and ethylene-vinyl acetate copolymer resins) is formed on the surface of the threads and unthreaded metal contact portion of a pin and/or a box. |
申请公布号 |
US9169951(B2) |
申请公布日期 |
2015.10.27 |
申请号 |
US201113881446 |
申请日期 |
2011.11.04 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION;VALLOUREC MANNESMANN OIL & GAS FRANCE |
发明人 |
Goto Kunio;Sasaki Masayoshi |
分类号 |
F16L11/00;F16L15/08;C10M169/04;E21B17/042;E21B17/08;F16L15/00;F16L58/18;B05D3/00;B05D3/06 |
主分类号 |
F16L11/00 |
代理机构 |
Clark & Body |
代理人 |
Clark & Body |
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 thermoplastic solid lubricating coating formed as an uppermost surface treatment coating layer, said thermoplastic solid lubricating coating containing particles of a copolymer of a resin selected from a silicone resin and a fluorocarbon resin with a different thermoplastic resin in a thermoplastic polymer matrix. |
地址 |
Tokyo JP |