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    MARTENSITE-BASED CHROMIUM-CONTAINING STEEL, AND STEEL PIPE FOR OIL WELL
    1.
    发明公开
    MARTENSITE-BASED CHROMIUM-CONTAINING STEEL, AND STEEL PIPE FOR OIL WELL 审中-公开
    MARTENSITBASIERTER CHROMHALTIGER STAHL UND STAHLROHRFÜRÖLBOHRLOCH

    公开(公告)号：EP3095886A1

    公开(公告)日：2016-11-23

    申请号：EP14878861.5

    申请日：2014-12-24

    申请人： Nippon Steel & Sumitomo Metal Corporation

    发明人： OMURA, Tomohiko ,  TOMIO, Yusaku ,  TAKABE, Hideki ,  MOCHIZUKI, Toshio

    IPC分类号： C22C38/00 ,  C22C38/24 ,  C21D8/02 ,  C21D8/10 ,  C21D9/08 ,  C22C38/54

    摘要： A martensitic Cr-containing steel having excellent corrosion resistance, SSC resistance, and IGHIC resistance is provided. A martensitic Cr-containing steel according to the present invention includes: a chemical composition consisting of, by mass%, Si: 0.05 to 1.0%, Mn: 0.1 to 1.0%, Cr: 8 to 12%, V: 0.01 to 1.0%, sol. Al: 0.005 to 0.10%, with the balance being Fe and impurities, wherein an effective Cr amount defined by "Cr - 16.6 x C" is not less than 8%, and an Mo equivalent defined by "Mo + 0.5 x W" is 0.03 to 2%; a micro-structure wherein a grain size number of prior-austenite crystal grain is not less than 8.0, and which consists of, in volume fraction, 0 to 5% of ferrite, 0 to 5% of austenite, with the balance being tempered martensite; and a yield strength of less than 379 to 551 MPa, wherein a grain-boundary segregation ratio of Mo and W is not less than 1.5.

    摘要翻译： 提供具有优异的耐腐蚀性，耐SSC性和耐IGHIC性的马氏体含Cr钢。 根据本发明的马氏体含Cr钢包括：质量％Si：0.05〜1.0％，Mn：0.1〜1.0％，Cr：8〜12％，V：0.01〜1.0％ ，溶胶 Al：0.005〜0.10％，余量为Fe和杂质，其中由“Cr-16.6×C”定义的有效Cr量不小于8％，由“Mo + 0.5×W”定义的Mo当量为 0.03〜2％ 原奥氏体晶粒的晶粒数不小于8.0的微结构，其体积分数为0-5％的铁素体，0-5％的奥氏体，余量为回火马氏体 ; 屈服强度小于379〜551MPa，其中Mo和W的晶界偏析比不小于1.5。

    METHOD FOR CORRECTING PIPE END OF SEAMLESS PIPE FORMED FROM HIGH-CR STAINLESS STEEL
    2.
    发明公开
    METHOD FOR CORRECTING PIPE END OF SEAMLESS PIPE FORMED FROM HIGH-CR STAINLESS STEEL 审中-公开
    用于校正的管的方法的无缝管从具有高CR-ANTEL不锈钢ENDS

    公开(公告)号：EP2676747A1

    公开(公告)日：2013-12-25

    申请号：EP12747464.1

    申请日：2012-02-14

    申请人： Nippon Steel & Sumitomo Metal Corporation

    发明人： MOCHIZUKI, Toshio

    IPC分类号： B21D41/02 ,  B21B23/00 ,  B21B25/04 ,  B21D3/14 ,  C10M105/24 ,  C22C38/00 ,  C22C38/46 ,  C10N10/02 ,  C10N30/00 ,  C10N40/24

    CPC分类号： B21D41/02 ,  B21D37/16 ,  B21D37/18 ,  B21D41/026 ,  C10M105/24 ,  C10M2207/1253 ,  C10N2210/02 ,  C10N2240/402 ,  C10N2240/406 ,  C10N2240/409 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C10N2210/01

    摘要： The pipe end correction method of a seamless pipe for correcting an inner diameter of pipe end of a seamless pipe made of a high Cr stainless steel containing 8 to 35 mass% Cr, and 0.1 to 10 mass% Ni includes: a pipe end correction step, following hot tube-making and heat treatment, of forcing a plug into the inside of pipe end portion of the seamless pipe for inner diameter correction so as to expand the pipe end portion while oxide scale remains accumulated on an inner surface of the pipe end portion of the seamless pipe, the oxide scale being generated during the tube-making or the heat treatment; and a lubricant film forming step, prior to the pipe end correction step, of applying lubricant at least either on the inner surface of the pipe end portion of the seamless pipe or on a surface of the plug so as to form a lubricant film thereon. This makes it possible to prevent seizure flaws from being generated on the inner surface of the pipe end portion in the case of producing the seamless pipe of the high Cr stainless steel.

    摘要翻译： 的无缝管的用于在由高铬不锈钢含有8〜35质量％Cr的无缝管的管端的内径校正管端矫正方法，和0.1〜10质量％的Ni，包括：一个管的端部修正步骤 ，继迫使插头到用于内直径校正的无缝管的管端部的内侧，以便扩大管端部，同时氧化皮仍然在管端的内表面上累积的热制管和热处理， 在无缝管的部分，管制造或在热处理过程中产生的氧化皮; 和润滑剂膜形成工序中，将管端部修正步骤之前，施加润滑剂中的至少一方上的无缝管的管端部的内表面或所述插塞的表面上的，从而形成薄膜在其上的润滑剂。 这使得可以防止癫痫发作的缺陷从在生产高铬不锈钢的无缝钢管的情况下，管端部的内表面上产生。