发明名称 |
Stalrorforbindelse med hoy rivingsmotstand, samt fremgangsmate for overflatebehandling av denne |
摘要 |
A screw joint of an oil-well pipe having a high seizure resistance. The threaded portion and metal seal portion of the pipe has a manganese phosphate chemical conversion treatment coating layer of 5 to 30 mu m thickness or a double-layer of a nitrogen treatment coating layer of 1 to 20 mu m thickness and a manganese phosphate chemical conversion treatment coating layer of 5 to 30 mu m thickness. The portions have also a solid lubricant coating layer of 10 to 45 mu m thickness formed by coating the portions with a solid lubricant having a specific composition and containing molybdenum disulfide powder or tungsten disulfide powder and at least one component selected from an epoxy resin, a furan resin and a polyamide-imide resin as the essential components and by subjecting them to a heat treatment. Due to such surface treatments, a steel pipe joint at which galling does not occur for a long time even when the number of repeated uses of the steel pipe is large can be obtained. <IMAGE> |
申请公布号 |
NO328656(B1) |
申请公布日期 |
2010.04.19 |
申请号 |
NO19970001523 |
申请日期 |
1997.04.03 |
申请人 |
NSCT PREMIUM TABULARS BV |
发明人 |
TSURU EIJI;OKA MASAHARU;NAGAYOSHI HARUYUKI;NAKASHIMA AKIRA;HIGUTI SEIJUN;INOUE RYUSUKE;AKIYAMA TOSHIO;SAGARA KAZUMI |
分类号 |
F16L15/00;C23C22/18;C23C22/83;E21B17/042;F16L15/06;F16L57/06;F16L58/18 |
主分类号 |
F16L15/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|