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    Cr-CONTAINING STEEL PIPE FOR LINEPIPE EXCELLENT IN INTERGRANULAR STRESS CORROSION CRACKING RESISTANCE OF WELDED HEAT AFFECTED ZONE
    3.
    发明公开
    Cr-CONTAINING STEEL PIPE FOR LINEPIPE EXCELLENT IN INTERGRANULAR STRESS CORROSION CRACKING RESISTANCE OF WELDED HEAT AFFECTED ZONE 审中-公开
    含Cr钢的管线管用具有优良的耐焊接热影响区域的INTER CRYSTALLINE应力腐蚀开裂

    公开(公告)号：EP2843068A1

    公开(公告)日：2015-03-04

    申请号：EP12875045.2

    申请日：2012-04-26

    申请人： JFE Steel Corporation

    发明人： MIYATA, Yukio ,  KIMURA, Mitsuo

    IPC分类号： C22C38/00 ,  C22C38/58

    CPC分类号： C22C38/58 ,  C21D6/004 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/50 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

    摘要： A Cr containing steel pipe for linepipe having high strength of X65 to X80 grade excellent in toughness, corrosion resistance, resistance to sulfide stress cracking and resistance to IGSCC in a welded heat affected zone is provided. Specifically, the steel pipe has a chemical composition consisting of, by mass%, C: 0.001% to 0.015%, Si: 0.05% to 0.50%, Mn: 0.10% to 2.0%, Al: 0.001% to 0.10%, Cr: 13% or more and less than 15%, Ni: 2.0% to 5.0%, Mo: 1.5% to 3.5%, V: 0.001% to 0.20%, N: 0.015% or less, and the balance being Fe and inevitable impurities, under the condition that P 1 is 11.5 to 13.3 and that P 2 =(0.5Cr+5.0)-P 1 is 0 or more. With this chemical composition, since a microstructure in a welded heat affected zone, which is subjected to heating up to a temperature range for forming ferrite single phase of 1300°C or higher and to cooling when welding is performed, is formed such that 50% or more of prior-ferrite grain boundaries, in a ratio with respect to the total length of the prior-ferrite grain boundaries, is occupied by martensite phase, and since formation of Cr carbide depleted zones is suppressed, a pipe having significantly increased resistance to IGSCC in a welded heat affected zone can be obtained. Since it is not necessary to perform a post weld treatment, there is a merit of significantly decreasing construction period of welded steel pipe structures.

    摘要翻译： 的含Cr钢管具有X65的高强​​度干线用管到X80级优异的韧性，耐腐蚀性，耐硫化物应力开裂性和耐IGSCC在焊接热影响区处。 具体而言，钢管的化学组成由...组成，以质量％计，C：0.001％〜0.015％以下，Si：0.05％至12：50％以下，Mn：0.10％至2.0％以下，Al：0.001％〜0.10％以下，Cr： 13％以上且小于15％以下，Ni：2.0％至5.0％以下，Mo：1.5％〜3.5％，V：0.001％至0.20％，N：0.015％或以下，余量为Fe和不可避免的杂质， 的条件下做了P 1为5.11至3.13，做P 2 =（0.5Cr + 5.0）-P 1为0以上。 与此化学组成中，由于在焊接热影响区中的微观结构，所有这一切进行加热的温度范围形成的1300℃以上的铁素体单相，并冷却在焊接进行时，形成的搜索没有50％ 或多个先前铁素体晶界的，在相对于所述现有的铁素体晶界的总长度之比，是由马氏体相占据，并且由于形成Cr碳化物贫化区被抑制，管具有显着增加至电阻 IGSCC在焊接热影响部可制得。 因为这是没有必要进行焊接后处理，有显着降低焊接钢管结构的施工工期的优点。

    THICK-WALLED HIGH-STRENGTH SEAMLESS STEEL PIPE WITH EXCELLENT SOUR RESISTANCE FOR PIPE FOR PIPELINE, AND PROCESS FOR PRODUCING SAME
    5.
    发明公开
    THICK-WALLED HIGH-STRENGTH SEAMLESS STEEL PIPE WITH EXCELLENT SOUR RESISTANCE FOR PIPE FOR PIPELINE, AND PROCESS FOR PRODUCING SAME 有权
    厚壁，高强度和无缝钢管耐酸性为PIPE并处理其

    公开(公告)号：EP2728030A1

    公开(公告)日：2014-05-07

    申请号：EP12805050.7

    申请日：2012-06-29

    申请人： JFE Steel Corporation

    发明人： ISHIGURO, Yasuhide ,  KIMURA, Mitsuo ,  EGUCHI, Kenichiro ,  YOKOGAWA, Hiroshi ,  KATAGIRI, Tadao ,  TANAKA, Masahito

    IPC分类号： C22C38/00 ,  C21D1/18 ,  C21D3/04 ,  C21D9/08 ,  C22C38/14 ,  C22C38/58

    CPC分类号： C21D9/085 ,  C21D1/25 ,  C21D1/63 ,  C21D8/105 ,  C21D2261/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/38 ,  C22C38/40 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  F16L9/02

    摘要： A heavy wall and high strength seamless steel pipe having high sour resistance is provided. In particular, a quenching and tempering treatment is conducted to adjust the yield strength to be higher than 450 MPa and adjust the wickers hardness HV5 that can be measured at an outermost side or an innermost side of the pipe under a 5 kgf load (test load: 49 N) to be 250 HV5 or less. In order to achieve this, surface layers are ground from surfaces by a depth of 0.3 mm or more in a wall thickness direction after the quenching treatment, or the quenching treatment is designed to include holding a heating temperature equal to or higher than the Ac3 transformation point for 120 seconds or more in an air atmosphere and then performing water-cooling in a nucleate boiling region or performing water-cooling in a film boiling region and then in a nucleate boiling region. As a result of this quenching treatment, the hardness of the surface layers decreases to 250 HV5 or less and a steel pipe that has an M-shape hardness distribution in which the maximum hardness appears at some point in the profile other than the center of the wall or a U-shape hardness distribution in which the hardness of the surface layers is the highest but not more than 250 HV5 or a flat shape hardness distribution can be obtained. As a result, the sour resistance is significantly improved.

    摘要翻译： 甲厚壁高强度无缝钢管具有高耐酸性设置。 特别地，淬火和回火处理以调整屈服强度为小于450MPa的高和调整搭接件硬度HV5 5负载（公斤力试验负荷下并关位测量的在最外侧，或者在管的最内部的侧 49 N）为250 HV5或更小。 为了实现这一点，表面层是从表面地面通过淬火处理后的0.3mm以上的壁厚方向上的深度，或淬火处理被设计为包括保持的加热温度等于或高于Ac3相变 点在空气气氛中为120秒以上，然后进行水冷在核态沸腾区域中或在泡核沸腾区域执行在膜态沸腾的冷却水区域，然后。 作为该淬火处理的结果，所述表面层的硬度降低至250 HV5或更小，而钢管并具有其中最大硬度出现在轮廓比的中心以外的某一点M-形状硬度分布 壁或马蹄形硬度分布，其中所述表面层的硬度是最高的，但不超过250 HV5或扁平形状的硬度分布可以得到。 其结果是，耐酸性显着提高。

    HIGH-STRENGTH STAINLESS STEEL SEAMLESS PIPE HAVING EXCELLENT CORROSION RESISTANCE FOR OIL WELL, AND METHOD FOR MANUFACTURING SAME
    6.
    发明公开
    HIGH-STRENGTH STAINLESS STEEL SEAMLESS PIPE HAVING EXCELLENT CORROSION RESISTANCE FOR OIL WELL, AND METHOD FOR MANUFACTURING SAME 审中-公开
    无缝钢管高强度和优异的耐腐蚀性，用于及其生产石油钻探和方法不锈钢

    公开(公告)号：EP2865777A1

    公开(公告)日：2015-04-29

    申请号：EP13807143.6

    申请日：2013-06-19

    申请人： JFE Steel Corporation

    发明人： EGUCHI, Kenichiro ,  ISHIGURO, Yasuhide ,  MIYATA, Yukio ,  KIMURA, Mitsuo

    IPC分类号： C22C38/00 ,  C21D9/08 ,  C22C38/46 ,  C22C38/54

    CPC分类号： C22C38/54 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/08 ,  C21D9/085 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

    摘要： Chemical composition contains, by mass%, C: 0.05% or less, Si: 0.5% or less, Mn: 0.15% or more and 1.0% or less, Cr: 13.5% or more and 15.4% or less, Ni: 3.5% or more and 6.0% or less, Mo: 1.5% or more and 5.0% or less, Cu: 3.5% or less, W: 2.5% or less, and N: 0.15% or less so that the relationship -5.9 x (7.82 + 27C - 0.91Si + 0.21Mn - 0.9Cr + Ni - 1.1Mo - 0.55W + 0.2Cu + 11N) ≥ 13.0 is satisfied. By this method, it is possible to manufacture a high strength stainless steel seamless pipe having excellent resistance to sulfide stress cracking equivalent to that of a steel having a chemical composition containing about 17% of Cr even with a chemical composition having comparatively low Cr content of about 15 mass%. In addition, V: 0.02% or more and 0.12% or less and/or Al: 0.10% or less and/or one or more selected from among Nb: 0.02% or more and 0.50% or less, Ti: 0.02% or more and 0.16% or less, Zr: 0.50% or less, and B: 0.0030% or less and/or one or more selected from among REM: 0.005% or less, Ca: 0.005% or less, and Sn: 0.20% or less may be further contained.

    摘要翻译： 化学组合物中含有以质量％计，C：0.05％以下，Si：0.5％以下，Mn：0.15％以上且1.0％以下，Cr：13.5％以上且15.4％以下，Ni：3.5％ 以上且6.0％以下，Mo：1.5％以上且5.0％以下，Cu：3.5％以下，W：2.5％以下，和N：0.15％以下所以没有关系-5.9 X（7.82 + 27℃ - + 0.91Si 0.21Mn - 0.9Cr +镍 - 1.1Mo - 0.55W + 0.2Cu + 11N）‰¥13.0成立。 通过该方法，能够制造具有优异的耐硫化物应力开裂相当于做了钢的具有如下化学成分含铬约17％，即使具有相对低的Cr含量的化学组成的高强度不锈钢无缝管 约15％（质量）。 此外，V：0.02％以上且0.12％，或更小和/或Al：0.10％以下和/或一种或选自Nb中多个选定：0.02％以上且0.50％以下，Ti：0.02％以上 和12：16％或以下，Zr：0.50％以下，以及B：0.0030％以下和/或一个或多个选自REM中选择的：0.005％以下，Ca：0.005％以下，及Sn：0.20％，或更小 可以进一步含有。

    SEAMLESS PIPE OF MARTENSITIC STAINLESS STEEL FOR OIL WELL PIPE AND PROCESS FOR PRODUCING THE SAME
    8.
    发明公开
    SEAMLESS PIPE OF MARTENSITIC STAINLESS STEEL FOR OIL WELL PIPE AND PROCESS FOR PRODUCING THE SAME 审中-公开
    油井管和无缝钢管马氏体不锈钢用于生产

    公开(公告)号：EP2322679A1

    公开(公告)日：2011-05-18

    申请号：EP08876878.3

    申请日：2008-12-24

    申请人： JFE Steel Corporation

    发明人： EGUCHI, Kenichiro ,  MIYATA, Yukio ,  KIMURA, Mitsuo

    IPC分类号： C22C38/00 ,  C22C38/48 ,  C22C38/58

    CPC分类号： C22C38/26 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/48

    摘要： A seamless steel tube for OCTG which possesses both of high strength of yield strength YS of 95 ksi grade (665 to 758 MPa) and excellent low-temperature toughness, and a manufacturing method of the seamless steel tube are provided. To be more specific, to a stainless steel seamless tube having the composition which contains, by mass%, 0.020% or less C, 10 to 14% Cr, 3% or less Ni, 0.05% or less N, 0.03 to 0.2% Nb, and optionally further, 1.0% or less Si, 0.1 to 2.0% Mn, 0.020% or less P, 0.010% or less S, 0.10% or less Al, and Fe and unavoidable impurities as a balance, quenching in which the seamless tube is heated at a quenching temperature of A c3 transformation temperature or above and, thereafter, the seamless tube is cooled to a temperature range of 100°C or less at a cooling rate of air cooling or more, and tempering which follows the quenching and in which the seamless tube is heated at a tempering temperature of 550°C or above and is cooled are applied. Due to such treatment, a martensitic stainless steel seamless tube for country tubular goods which has the tempered martensitic structure where a precipitated Nb quantity is 0.020% or more, and possesses both of high strength at yield strength of 95 ksi grade and the excellent low-temperature toughness of fracture transition temperature vTrs of -40°C or below, and allows the hot straightening. In addition to the above-mentioned composition, the seamless steel tube may further contain one or two kinds of elements selected from Cu, Mo and/or one or two kinds selected from V, Ti, B in addition to the above-mentioned composition.

    摘要翻译： 提供了用于OCTG的无缝钢管其具有两个高强度的为95ksi级（665至758兆帕）和优良的低温韧性，以及无缝钢管的制造方法的屈服强度YS的。 更具体地，涉及一种具有其中包含，以质量％计的组合物，0.020％或更少的C，10〜14％的Cr，3％或更少的Ni，0.05％以下N不锈钢无缝管; 0.03〜0.2％的Nb ，并任选地进一步，1.0％或更少的Si，0.1〜2.0％的Mn，0.020％或更少的P，0.010％或更少的S，0.10％或更少的Al，和Fe及不可避免的杂质作为余量，淬火其中无缝管 在Ac 3转变温度的以上和淬火温度下加热，此后，无缝管在空气冷却或更多，和回火的冷却速度跟随在淬火和冷却至温度范围为100℃或更低 其中无缝管在550℃的回火温度以上加热和冷却应用。 由于寻求治疗，对于国家管用马氏体系不锈钢无缝钢管其具有回火马氏体结构，其中一个析出Nb量为0.020％以上，并且具有两个高强度在95千磅级屈服强度和优良的低 为-40℃或更低断裂转变临界温度vTrs的低温韧性，并允许该热矫直。 除了上述组合物中，无缝钢管还可以含有选自Cu，Mo和/或除了上述组合物从钒，钛，B中选择一种或两种选择的元素的一种或两种。