公开(公告)号：EP0786616A4

公开(公告)日：1998-05-27

申请号：EP95933616

申请日：1995-10-04

申请人： NIPPON STEEL CORP

发明人： TSURU EIJI ,  OKA MASAHARU ,  NAGAYOSHI HARUYUKI ,  NAKASHIMA AKIRA ,  HIGUTI SEIJUN ,  INOUE RYUSUKE ,  AKIYAMA TOSHIO ,  SAGARA KAZUMI

IPC分类号： C23C22/18 ,  C23C22/83 ,  E21B17/042 ,  F16L15/00 ,  F16L15/06 ,  F16L57/06 ,  F16L58/18 ,  B05D7/14 ,  B32B15/08

CPC分类号： F16L15/001 ,  C23C22/18 ,  C23C22/83 ,  E21B17/042 ,  F16L15/00 ,  F16L57/06 ,  F16L58/182 ,  Y10T29/49885

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.

摘要翻译： 具有高耐发热胶着性的油井管的螺纹接头。 管的螺纹部和金属密封部具有5至30微米的厚度或1至20微米厚的氮化处理涂层和磷酸锰系化学转化的双层的磷酸锰系化学转化处理覆膜层 5至30微米厚度的治疗涂层。 部分具有因此通过涂覆部分与固体润滑剂具有特定组成和在环氧树脂含有选自二硫化钼粉末或二硫化钨粉末和至少一种组分，形成10〜45微米厚的固体润滑覆膜层 呋喃树脂和聚酰胺 - 酰亚胺树脂作为主要组分，并通过对它们进行热处理。 由于追求表面处理，在该磨损钢管接头不会发生的，即使钢管的反复使用的数量大可以得到很长的时间。