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    High-strength stainless steel bolt and method of manufacturing the same
    1.
    发明申请
    High-strength stainless steel bolt and method of manufacturing the same 审中-公开
    高强度不锈钢螺栓及其制造方法

    公开(公告)号：US20040003639A1

    公开(公告)日：2004-01-08

    申请号：US10614237

    申请日：2003-07-08

    申请人： TRI TECHNO LTD. ,  JAPAN MATRIX CO., LTD.

    发明人： Keisuke Matsuki

    IPC分类号： B21B045/02

    CPC分类号： B21K1/46 ,  B21H3/00 ,  B21J3/00 ,  B23P15/00

    摘要： A method of manufacturing a high-strength austenitic stainless bolt having a tensile strength of 1100 MPa or more on an industrial mass-production basis. The method of manufacturing a high-strength stainless steel bolt according to the present invention comprises the steps offorming a lubricant coating on the surface of an austenitic stainless steel wire material to obtain a lubricated wire material; cold forming the lubricated wire material within a degree-of-working range of from 0.5 to 1.5 as defined in a natural logarithmic value of the working distortion such that a head portion is bulged as a result of axial compression of the cold formed wire material and a threaded portion formed of part of the bolt material extruded under said axial compression and radially compressed; and then subjecting said threaded portion to form rolling, said lubricant coating being free from exfoliation and destruction at said degree of working range.

    摘要翻译： 一种在工业大规模生产的基础上制造拉伸强度为1100MPa以上的高强度奥氏体不锈钢螺杆的方法。 根据本发明的高强度不锈钢螺栓的制造方法包括在奥氏体不锈钢丝材料的表面上形成润滑剂涂层以获得润滑的线材的步骤; 在由工作变形的自然对数值定义的0.5至1.5的工作范围内冷成型润滑线材，使得由于冷成形的线材材料的轴向压缩而使头部隆起，并且 螺纹部分由螺栓材料的一部分在所述轴向压缩下挤出并径向压缩形成; 然后对所述螺纹部进行轧制，所述润滑剂涂层在所述工作范围内没有剥离和破坏。