Threaded joint for steel pipes
    154.
    发明申请
    Threaded joint for steel pipes 有权
    钢管螺纹接头

    公开(公告)号:US20040239105A1

    公开(公告)日:2004-12-02

    申请号:US10765837

    申请日:2004-01-29

    Abstract: A threaded joint for steel pipes comprising a pin 1 and a box 2 each having a contact surface comprising a threaded portion 3 or 4 and an unthreaded metal contact portion 8 is provided with improved anti-galling propertied by forming a lubricating coating on the contact surface of at least one of the pin and the box, the lubricating coating exhibiting a self-repairing function by liquid lubrication and having a decreased greasiness. The lubricating coating is (1) a coating which comprises a lower lubricant layer which is in liquid form in the temperature range of above 0null C. and below 40null C. and an upper lubricant layer which is in solid form at 40null C., or (2) a coating which is semi-solid or solid at 40null C. and is formed of a mixture comprising a lubricating oil which is in liquid form in the temperature range of above 0null C. and below 40null C. and a wax which is in solid form at 40null C., the mixture preferably having been heated so as to liquefy the wax and dissolve in each other the wax and lubricant oil.

    Abstract translation: 一种用于钢管的螺纹接头,其包括销1和盒2,每个具有包括螺纹部分3或4的接触表面和无螺纹金属接触部分8的盒子2具有通过在接触表面上形成润滑涂层而具有改进的防磨损 的销和盒中的至少一个,润滑涂层通过液体润滑显示出自修复功能并且具有降低的油脂性。 润滑涂层是(1)涂层,其包括在0℃以上且低于40℃的温度范围内为液态的下润滑剂层,以及在40℃为固体形式的上润滑剂层 ,或(2)在40℃下为半固体或固体的涂层,并且由包含在0℃以上且低于40℃的温度范围内为液态的润滑油的混合物形成的涂层 和在40℃下为固体形式的蜡,所述混合物优选已被加热以使蜡液化并彼此溶解蜡和润滑油。

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