Method for Producing Seamless Pipe
    3.
    发明申请
    Method for Producing Seamless Pipe 审中-公开
    无缝管生产方法

    公开(公告)号:US20110023569A1

    公开(公告)日:2011-02-03

    申请号:US12884983

    申请日:2010-09-17

    IPC分类号: B21B19/04

    摘要: Disclosed is a method for producing a seamless pipe by using a piercing mill which pierces and rolls a round billet heated to 1300° C. or lower, wherein the piercing mill is composed of a pair of skew rolls disposed to face each other around a pass line, a pair of guide devices disposed to face each other around the pass line, and a plug disposed along the pass line, between the pair of the skew rolls and also between the pair of the guide devices, wherein the piercing-rolling is performed under the conditions satisfying the following formulas (1) to (3) to prevent wrinkle flaws of the seamless pipe: −1.0

    摘要翻译: 本发明公开了一种通过使用对加热到1300℃以下的圆钢坯进行穿孔和轧制的穿孔机来制造无缝管的方法,其中,所述穿孔机由一对设置成围绕一圈的倾斜辊组成 一对引导装置被设置为围绕传送线路彼此面对,以及沿着传输线设置在一对扭斜辊之间以及一对引导装置之间的插头,其中执行穿孔轧制 在满足下列公式(1)至(3)的条件下,以防止无缝管的褶皱缺陷:-1.0 <&Dgr;&Thetas; (1)&Dgr;&thetas; =&thetas; p-&thetas; r(2)-0.37×&Dgr;&Thetas; + 1.47&nlE; Rn&nlE; 0.37×&Dgr;&Thetas; +2.67(3) 上述公式如下:&rd; r:在主辊的进给角度为零的情况下,通过线与主辊面之间的半角(°); p:半角(° )插头线圈和卷绕部分之间Rn:插头的卷绕次数

    Method for producing martensitic stainless steel tubes
    4.
    发明申请
    Method for producing martensitic stainless steel tubes 审中-公开
    制造马氏体不锈钢管的方法

    公开(公告)号:US20070251611A1

    公开(公告)日:2007-11-01

    申请号:US11723622

    申请日:2007-03-21

    申请人: Takateru Inage

    发明人: Takateru Inage

    IPC分类号: C21D9/08

    摘要: Martensitic stainless steel tubes are produced by optimizing the chemical composition of steel for billets (C: 0.15-0.22%, Si: 0.1-1.0%, Mn: 0.10-1.00%, Cr: 12.00-14.00%, N: 0.01-0.05%, P: not more than 0.020% and S: not more than 0.010%) and the relation between the soaking temperature for pierced-and-rolled tubing material and the section area reduction rate in final rolling. By this method, delayed fracture cracking in impact-receiving portions of tubes in martensitic stainless steel s such as 13% Cr tubes can be inhibited and the generation of inner-surface flaws can be prevented.

    摘要翻译: 马氏体不锈钢管是通过优化钢坯的化学成分(C:0.15-0.22%,Si:0.1-1.0%,Mn:0.10-1.00%,Cr:12.00-14.00%,N:0.01-0.05% ,P:不大于0.020%,S:不大于0.010%),以及穿孔轧制材料的均热温度与最终轧制时的截面积减少率之间的关系。 通过这种方法,可以抑制诸如13%Cr管的马氏体不锈钢的管的冲击接收部分的延迟断裂,并且可以防止内表面缺陷的产生。