Threaded joint for steel pipes and process for the surface treatment thereof
    364.
    发明授权
    Threaded joint for steel pipes and process for the surface treatment thereof 有权
    钢管螺纹接头及其表面处理工艺

    公开(公告)号:US06827996B2

    公开(公告)日:2004-12-07

    申请号:US10361556

    申请日:2003-02-11

    Applicant: Kunio Goto

    Inventor: Kunio Goto

    Abstract: This invention relates to a threaded joint for steel pipes which comprises a pin and a box each having a contact surface including a threaded portion and an unthreaded metal contact portion and which can be prevented from galling during repeated fastening and loosening without application of a compound grease. A solid lubricant coating which comprises a lubricating powder such as molybdenum disulfide and a resin binder is formed on the contact surface of at least one of the pin and the box. The solid lubricant coating has a hardness of 70-140 on the Rockwell M scale and an adhesive strength of at least 500 N/m as determined by the SAICAS (Surface And Interfacial Cutting Analysis System) method, and it exhibits excellent galling resistance even in the environment of high-temperature oil wells. Inclusion of ultraviolet screening fine particles such as titanium oxide fine particles in the solid lubricant coating increases the rust preventing properties of the threaded joint.

    Abstract translation: 本发明涉及一种用于钢管的螺纹接头,其包括销和箱体,每个销和箱都具有包括螺纹部分和无螺纹金属接触部分的接触表面,并且可以防止在反复紧固和松动期间不产生磨损而不施加复合润滑脂 。 在销和盒中的至少一个的接触表面上形成包含润滑粉末如二硫化钼和树脂粘合剂的固体润滑剂涂层。 固体润滑剂涂层在洛氏硬度计上具有70-140的硬度,并且通过SAICAS(表面和界面切割分析系统)方法确定的至少500N / m的粘合强度,并且即使在 高温油井的环境。 在固体润滑剂涂层中包含紫外线屏蔽细颗粒如氧化钛微粒增加螺纹接头的防锈性能。

Patent Agency Ranking