THREADED JOINT FOR STEEL PIPE AND METHOD FOR SURFACE TREATMENT OF THE THREADED JOINT
    324.
    发明公开
    THREADED JOINT FOR STEEL PIPE AND METHOD FOR SURFACE TREATMENT OF THE THREADED JOINT 有权
    GEWINDEVERBINDUNGFÜRSTAHLROHR UND VERFAHREN ZUROBERFLÄCHENBEHANDLUNGDER GEWINDEVERBINDUNG

    公开(公告)号:EP1378699A1

    公开(公告)日:2004-01-07

    申请号:EP02717105.7

    申请日:2002-04-11

    Abstract: A threaded joint for steel pipe formed on a pin and a box having a contact surface including a threaded parts and a non-threaded metal contact part and capable of preventing a galling by repeated fastening and loosening operations without applying compound grease thereto, wherein a solid lubricating film including lubricating powder such as molybdenum disulfide and resin binder is formed on the contact surface of at least one of the pin and the bo by drying the film by primary heating in the temperature range of 70 °C to 150 °C and by a secondary heating in the range of from higher than 150 °C to 380 °C, the solid lubricating film thus obtained has a Rockwell M scale hardness of 70 to 140, an adhesive strength of 500 N/m or higher obtained by the SAICAS (Surface And Interfacial Cutting Analysis System) method, and excellent galling resistance and airtightness even in a high temperature well environment, and, when ultraviolet ray shielding particles such as titanium oxide are contained in the solid lubricating film, the rust-proofness of the threaded joint is increased.

    Abstract translation: 一种用于钢管的螺纹接头,其形成在具有接触表面的销和盒上,该接触表面包括螺纹部分和非螺纹金属接触部分,并且能够通过反复紧固和松动操作来防止磨损,而不对其施加复合润滑脂,其中固体 通过在70℃至150℃的温度范围内通过一次加热干燥该膜,在至少一个销和bo的接触表面上形成包括润滑粉末如二硫化钼和树脂粘合剂的润滑膜,并通过 二次加热在高于150℃至380℃的范围内,所得固体润滑膜的洛氏硬度为70〜140,粘合强度为500N / m以上,通过SAICAS(Surface 和界面切割分析系统)方法,即使在高温环境下也具有优异的耐擦伤性和气密性,并且当紫外线屏蔽颗粒如氧化钛 e包含在固体润滑膜中,螺纹接头的防锈性增加。

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