Joint for steel pipe having high galling resistance and surface
treatment method thereof
    1.
    发明授权
    Joint for steel pipe having high galling resistance and surface treatment method thereof 失效
    具有高耐磨性的钢管接头及其表面处理方法

    公开(公告)号:US6027145A

    公开(公告)日:2000-02-22

    申请号:US809344

    申请日:1997-05-23

    摘要: An object of the present invention is to provide galling resistance to a threaded joint used for an oil well pipe. On a thread portion and a metallic sealing portion of the joint, there is provided a manganese phosphate chemical formation coating layer, or alternatively there are provided a nitriding layer of 1 to 20 .mu.m thickness and a manganese phosphate chemical formation coating layer of 5 to 30 .mu.m thickness, and also there is coated a solid lubricant which contains powder of molybdenum disulfide or tungsten disulfide and also contains one of epoxy resin, furan resin and polyamide resin as an essential component, and a ratio of composition is maintained at a specific value, so that a solid lubricant coating layer of 10 to 45 .mu.m thickness can be formed by heating.Due to the above surface treatment, even when the frequency of repetition of fastening and unfastening of the joint is increased, the occurrence of galling can be prevented over a long period of time.

    摘要翻译: PCT No.PCT / JP95 / 02034第Sec。 371日期1997年5月23日 102(e)日期1997年5月23日PCT提交1995年10月4日PCT公布。 公开号WO96 / 10710 PCT 日本1996年4月11日本发明的目的在于提供耐油性,用于油井管用螺纹接头。 在接头的螺纹部分和金属密封部分上,设置有磷酸锰化学成膜涂层,或者设置有1〜20μm厚的氮化层和5〜 并且还涂覆了含有二硫化钼或二硫化钨粉末的固体润滑剂,并且还含有环氧树脂,呋喃树脂和聚酰胺树脂之一作为必需组分,并且组成比保持在特定的 值,可以通过加热形成10〜45μm厚的固体润滑剂涂层。 由于上述表面处理,即使当接头的紧固和松开的重复频率增加时,也可以长时间地防止磨损的发生。