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1. 发明专利

JP2013227670A Low yield ratio high strength steel sheet, method for producing the same, and high strength welded steel pipe using the same 有权
标题翻译：低强度比高强度钢板，其制造方法和使用其的高强度焊接钢管
公开(公告)号：JP2013227670A
公开(公告)日：2013-11-07
申请号：JP2013066758
申请日：2013-03-27
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： SHIMAMURA JUNJI , NISHIMURA KIMIHIRO
IPC分类号： C22C38/00 , B21B3/00 , C21D8/02 , C21D8/10 , C21D9/08 , C21D9/50 , C22C38/14 , C22C38/58
CPC分类号： F16L9/02 , B23K9/025 , B23K9/18 , B23K9/23 , B23K31/027 , B23K2201/06 , B23K2201/10 , C21D6/001 , C21D6/002 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/02 , C21D8/0226 , C21D8/0263 , C21D8/105 , C21D9/08 , C21D9/50 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide: a low yield ratio high strength steel sheet having superior strain aging resistance of an API 5L X70 grade or less; a method for producing the same; and a high strength welded steel pipe using the steel sheet.SOLUTION: A low yield ratio high strength steel sheet has a component composition including, by mass, 0.03-0.08% of C, 0.01-1.0% of Si, 1.2-3.0% of Mn, ≤0.015% of P, ≤0.005% of S, ≤0.08% of Al, 0.005-0.07% of Nb, 0.005-0.25% of Ti, ≤0.010% of N, and ≤0.005% of O, and the balance Fe with inevitable impurities. In the steel sheet, the metal structure is such a structure that an upper layer part within 5 mm from the surface or the rear surface contains polygonal ferrite, the area fraction of island-like martensite is 3-15% and the circle-equivalent diameter of the martensite is ≤3.0 μm, and the area fraction of the polygonal ferrite in the surface layer part is ≥10% and
摘要翻译：要解决的问题：提供：具有API 5L X70等级或更低等级的优异的耐应变老化性的低屈服比高强度钢板; 其制造方法; 以及使用该钢板的高强度焊接钢管。解决方案：低屈服比高强度钢板具有以下成分组成：质量0.03〜0.08％，Si：0.01〜1.0％，Si：1.2〜3.0％ Mn，≤0.015％的P，≤0.005％的S，≤0.08％的Al，0.005-0.07％的Nb，0.005-0.25％的Ti，≤0.010％的N，以及≤0.005％的O，余量铁与不可避免的杂质。在钢板中，金属结构是这样一种结构，使得距离表面或后表面5mm以内的上层部分含有多边形铁素体，岛状马氏体的面积分数为3-15％，圆当量直径的马氏体≤3.0μm，表层部的多边形铁素体的面积分率为≥10％且<80％，余量为贝氏体。

2. 发明专利

JP2010235986A High-strength steel sheet excellent in pwht-resistant characteristics and uniformly stretching characteristics, and manufacturing method therefor 有权
标题翻译：高强度钢板耐腐蚀特性和均匀拉伸特性及其制造方法
公开(公告)号：JP2010235986A
公开(公告)日：2010-10-21
申请号：JP2009083589
申请日：2009-03-30
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： SHIMAMURA JUNJI , ISHIKAWA NOBUYUKI , SHIKAUCHI NOBUO
IPC分类号： C22C38/00 , B21B3/00 , C21D8/02 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high-strength steel sheet obtaining excellent PWHT (post-welding heat treatment) resistant characteristics without adding large quantity of alloy-elements and excellent uniform stretching characteristics.
SOLUTION: This steel sheet has the component composition composed of, by mass, 0.03-0.07% C, 0.01-0.5% Si, 1.5-2.5% Mn, 0.01-0.08% Al, 0.005-0.025% Ti, 0.005-0.025% Nb, 0.15-0.60% Mo and one or more of ≤1.0% Cu, ≤1.0% Ni, ≤1.0% Cr, ≤0.10% V, and has 0.19-0.25 P
CM value and satisfies 9×[Ceq value]+4×[P value]≥4.8 and in atom%, [C]/([Mo]+[Ti]+[Nb]+[V]):0.6-1.7 and has ≥0.1 mass% solid-soluble Mo content and ≥760 MPa tensile strength and ≥690 MPa yield strength in the tensile characteristic and ≥5% uniformly stretching.
COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供一种在不增加大量合金元素和优异的均匀拉伸特性的情况下获得优异的PWHT（焊后热处理）特性的高强度钢板。解决方案：该钢板的组成成分为质量0.03-0.07％，Si：0.01-0.5％，Mn：1.5〜2.5％，Al：0.01-0.08％，Ti：0.005〜0.025％，Ti：0.005〜 0.025％的Nb，0.15-0.60％的Mo和一种或多种≤1.0％的Cu，≤1.0％的Ni，≤1.0％的Cr，≤0.10％的V，并具有0.19-0.25P CM 满足9×[Ceq值] + 4×[P值]≥4.8，原子％，[C] /（[Mo] + [Ti] + [Nb] + [V]）：0.6-1.7，≥0.1 质量％的固溶钼含量和≥760MPa的拉伸强度和≥690MPa的拉伸特性屈服强度和≥5％的均匀拉伸。版权所有（C）2011，JPO＆INPIT

3. 发明专利

JP2009174024A High-strength steel sheet having excellent pwht resistance, and method for producing the same 有权
标题翻译：具有优异耐腐蚀性的高强度钢板及其制造方法
公开(公告)号：JP2009174024A
公开(公告)日：2009-08-06
申请号：JP2008015505
申请日：2008-01-25
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： SHIMAMURA JUNJI , ISHIKAWA NOBUYUKI , OKATSU MITSUHIRO , SHIKAUCHI NOBUO
IPC分类号： C22C38/00 , B21B3/00 , C21D8/02 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high-strength steel sheet exhibiting excellent PWHT (post-weld heat treatment) resistance. SOLUTION: Disclosed is a high-strength steel sheet having a componential composition comprising 0.03 to 0.07% C, 0.01 to 0.5% Si, 1.5 to 2.5% Mn, 0.1 to 0.5% Mo, ≤0.08% Al, 0.005 to 0.035% Ti and 0.005 to 0.07% Nb, and in which Ceq value (mass%)=C+Mn/6+(Cu+Ni)/12+(Cr+Mo+V)/5 and P value (atomic%)=[Mo]+[Ti]+[Nb]+[V] satisfy 9×Ceq value+4×P value≥4.8, and also, 0.6 (atomic%)≤[C]/([Mo]+[Ti]+[Nb]+[V])≤1.7 (atomic%) is satisfied, and essentially composed of a bainitic structure in which the fraction of insular martensite is ≤2%, wherein, (Ti and/or Nb) compound carbides essentially composed of Mo with an equivalent circle diameter of ≤10 nm are dispersed by ≥30 pieces per 1 μm 2 , and the total precipitation amount of the compound carbides is ≥0.03 mass%. COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供表现出优异的PWHT（焊后热处理）电阻的高强度钢板。解决方案：公开了一种高强度钢板，其具有包含0.03〜0.07％的C，0.01〜0.5％的Si，1.5〜2.5％的Mn，0.1〜0.5％的Mo，≤0.08％的Al，0.005〜0.035的组成成分％Ti和0.005〜0.07％Nb，Ceq值（质量％）= C + Mn / 6 +（Cu + Ni）/ 12 +（Cr + Mo + V）/ 5，P值（原子％）= [Mo] + [Ti] + [Nb] + [V]满足9×Ceq + 4×P值≥4.8，0.6（原子％）≤[C] /（[Mo] + [Ti] [Nb] + [V]）≤1.7（原子％），基本上由岛状马氏体的比例≤2％的贝氏体组成，其中（Ti和/或Nb）化合物碳化物主要由等效圆直径≤10nm的Mo以每1微米 2分散≥30块，复合碳化物的总沉淀量≥0.03质量％。版权所有（C）2009，JPO＆INPIT

4. 发明专利

JP2013112872A High-toughness, low-yield-ratio, high-strength steel sheet excellent in strain aging resistance 有权
标题翻译：高韧性，低合金钢，高强度钢，耐老化性优异
公开(公告)号：JP2013112872A
公开(公告)日：2013-06-10
申请号：JP2011261605
申请日：2011-11-30
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： NAKAMICHI JIRO , SHIMAMURA JUNJI , NISHIMURA KIMIHIRO
IPC分类号： C22C38/00 , C21D8/02 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high-toughness, low-yield-ratio, high-strength steel sheet excellent in strain aging resistance.SOLUTION: The high-toughness, low-yield-ratio, high-strength steel sheet excellent in strain aging resistance includes a component comprising, by mass, 0.04-0.07% C, 0.01-1.0% Si, 1.2-3.0% Mn, ≤0.015% P, ≤0.005% S, ≤0.08% Al, 0.005-0.05% Nb, 0.005-0.025% Ti, ≤0.010% N, ≤0.005% O and the balance being Fe with inevitable impurities and has a two-phase metallic structure of bainite and insular martensite, wherein the area fraction and the circle-equivalent diameter of the insular martensite (hereinafter referred to as MA) is 3-15% and ≤5.0 μm, respectively, the area fraction of the γ phase contained in MA is ≤10%, and the product value of the carbon content (mass%) in MA and area fraction (%) of MA is 3.0-4.5.
摘要翻译：要解决的问题：提供耐应变时效性优异的高韧性，低屈服比的高强度钢板。解决方案：应变耐老化性优异的高韧性，低屈服比，高强度钢板包括以质量计含有0.04-0.07％C，0.01-1.0％Si，1.2-3.0％ Mn，≤0.015％P，≤0.005％S，≤0.08％Al，0.005-0.05％Nb，0.005-0.025％Ti，≤0.010％N，≤0.005％O，余量为Fe和不可避免的杂质，贝氏体和岛状马氏体的相金属结构，其中岛状马氏体（以下称为MA）的面积分数和圆当量直径分别为3-15％和≤5.0μm，γ相的面积分数 MA含量≤10％，MA中的碳含量（质量％）和MA的面积分数（％）的乘积值为3.0〜4.5。版权所有（C）2013，JPO＆INPIT

5. 发明专利

JP2013057125A High strength/high toughness thick steel plate excellent in cutting-crack resistance and dwtt characteristic 有权
标题翻译：高强度/高韧性厚钢板优良的切割电阻和DWTT特性
公开(公告)号：JP2013057125A
公开(公告)日：2013-03-28
申请号：JP2012234574
申请日：2012-10-24
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： OKATSU MITSUHIRO , ENDO SHIGERU , MURAOKA RYUJI , SHIMAMURA JUNJI
IPC分类号： C22C38/00 , C21D8/02 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength/high toughness thick steel plate, which is excellent in preventing the generation of cracking on the cutting surface in cutting with a shearing work and excellent in DWTT characteristics.SOLUTION: The thick steel plate has a component composition comprising, by mass%, 0.03 to 0.12% C, ≤0.5% Si, 1.5 to 3.0% Mn, 0.01 to 0.08% Al, 0.01 to 0.08% Nb, 0.005 to 0.025% Ti and 0.001 to 0.01% N and further, one or two or more kinds of Cu, Ni, Cr, Mo, V, B, and if necessary, one or two or more kinds of Ca, REM, Zr, Mg and the balance Fe with inevitable impurities, and includes bainite or martensite in a microstructure, and the average particle diameter of cementite present in their structures is ≤0.5 μm.
摘要翻译：要解决的问题：提供一种高强度/高韧性的厚钢板，其优异的防止在用剪切作业切割切割表面产生裂纹并且具有优异的DWTT特性。解决方案：厚钢板具有以质量％计含有0.03〜0.12％C，≤0.5％Si，1.5〜3.0％Mn，0.01〜0.08％Al，0.01〜0.08％Nb，0.005〜 0.025％的Ti和0.001〜0.01％的N，还有一种或两种以上的Cu，Ni，Cr，Mo，V，B，如果需要，可以使用一种或两种以上的Ca，REM，Zr，Mg和平衡Fe与不可避免的杂质，包括微观结构中的贝氏体或马氏体，其结构中存在的渗碳体的平均粒径≤0.5μm。版权所有（C）2013，JPO＆INPIT

6. 发明专利

JP2012107333A High-strength steel for high-pressure hydrogen storage container 有权
标题翻译：用于高压氢储存容器的高强度钢
公开(公告)号：JP2012107333A
公开(公告)日：2012-06-07
申请号：JP2011235740
申请日：2011-10-27
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： ISHIKAWA NOBUYUKI , SHIMAMURA JUNJI , SUEYOSHI HITOSHI
IPC分类号： C22C38/00 , C21D8/02 , C21D8/10 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel having high strength of ≥780 MPa tensile strength, which is excellent in toughness and suitable to be used in a high-pressure hydrogen environment, such as a hydrogen storing vessel and an accumulator installed in a hydrogen station or the like.SOLUTION: This steel contains, by mass, 0.05-0.15% C, 0.01-0.50% Si, >0.6-2.5% Mn, ≤0.02% P, ≤0.003% S, 0.01-0.08% Al, and optionally one or two or more kinds selected from Cu, Ni, Cr, Mo, Nb, V, Ti, B and Ca, with ≥0.19 Pcm and the remainder comprising Fe and incidental impurities, wherein a metal structure includes lower bainite whose area fraction is ≥70% and an island martensite whose area fraction is ≤3%, and the tensile strength is ≥780 MPa. Pcm(%)=C+Si/30+(Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B, wherein each symbol of element represents a content (mass%).
摘要翻译：要解决的问题：为了提供具有优异的韧性和适合于在高压氢环境中使用的高强度≥780MPa的拉伸强度的钢，例如储氢容器和储存器安装在氢气站等中。解决方案：该钢含有0.05-0.15％C，0.01-0.50％Si，> 0.6-2.5％Mn，≤0.02％P，≤0.003％S，0.01-0.08％Al和任选的一种或选自Cu，Ni，Cr，Mo，Nb，V，Ti，B和Ca中的两种或更多种，≥0.19Pcm，余量包含Fe和杂质，其中金属结构包括下部贝氏体，其面积分数≥ 70％，岛状马氏体面积率≤3％，拉伸强度≥780MPa。 Pcm（％）= C + Si / 30 +（Mn + Cu + Cr）/ 20 + Mo / 15 + Ni / 60 + V / 10 + 5B，其中元素的每个符号表示含量（质量％）。版权所有（C）2012，JPO＆INPIT

7. 发明专利

JP2010100903A Thick high tensile strength steel plate having low yield ratio and brittle crack generation resistance, and method of producing the same 有权
标题翻译：具有低屈服强度和脆性裂纹产生电阻的厚度高的拉伸强度钢板及其生产方法
公开(公告)号：JP2010100903A
公开(公告)日：2010-05-06
申请号：JP2008273905
申请日：2008-10-24
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： OKATSU MITSUHIRO , SHIMAMURA JUNJI , ENDO SHIGERU , SHIKAUCHI NOBUO
IPC分类号： C22C38/00 , B21B1/26 , B21B3/00 , C21D8/02 , C22C38/16 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel plate which has a low yield ratio and excellent brittle crack generation resistance, and is suitable for a high strength line pipe having a pipe thickness of ≥20 mm and a tensile strength of >600 MPa, and to provide a method for producing the same. SOLUTION: The steel is composed of a Cu-Ni-Nb-Ti system as the fundamental component system and, as necessary, comprises one or two kinds selected from Mo, Cr, V, B, Ca, rare earth metals, Zr and Mg, and the balance Fe with inevitable impurities, and in which the Vickers hardness Hvm of the central part in the plate thickness part satisfies Hvm≤1.05 Hva to the average Hva of the Vickers hardness in the plate thickness direction, a microstructure is essentially composed of bainite, and insular martensite is dispersed in the bainite at an area ratio of 5 to 15% as a second phase. The steel having the above composition is reheated to a specified temperature, is subjected to hot rolling including a cumulative draft of ≥30% in the temperature range of ≤1,000 to ≥950°C, is subjected to accelerated cooling after the completion of the rolling, is reheated to a specified temperature, and is air-cooled. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：为了提供一种低屈服比和优异的脆性裂纹产生阻力的钢板，适用于管厚≥20mm，抗张强度> 600的高强度管线管并提供其制造方法。解决方案：该钢由Cu-Ni-Nb-Ti系作为基本成分体系，根据需要含有选自Mo，Cr，V，B，Ca，稀土金属中的一种或两种， Zr和Mg，余量为Fe与不可避免的杂质，其中板厚部分中心部分的维氏硬度Hvm相对于维氏硬度在板厚方向上的平均Hva满足Hvm≤1.05Hva，微结构为基本上由贝氏体组成，岛状马氏体以5〜15％的面积比分散在贝氏体中作为第二相。将具有上述组成的钢再加热至规定温度，在≤1000〜≥950℃的温度范围内进行包括≥30％的累积牵伸的热轧，在轧制结束后进行加速冷却，再加热至指定温度，并进行风冷。版权所有（C）2010，JPO＆INPIT

8. 发明专利

JP2013049896A High-strength welded steel pipe having high uniform elongation characteristic and excellent in weld zone toughness and method for manufacturing the same 有权
标题翻译：具有高均匀延伸特性的高强度焊接钢管，焊接区域韧性优良，制造方法
公开(公告)号：JP2013049896A
公开(公告)日：2013-03-14
申请号：JP2011188577
申请日：2011-08-31
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： OKATSU MITSUHIRO , TANIZAWA AKIHIKO , SHIMAMURA JUNJI
IPC分类号： C22C38/00 , B21B3/00 , B21C37/08 , B23K35/30 , C21D8/10 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide: a high-strength welded steel pipe for an API X80 grade (tensile strength 700 MPa) or higher high-strength line pipe, achieving both excellent deformability which satisfies a ratio of a 1.5% yield strength relative to 0.5% yield strength of a base material of 1.10 or more and a product of a tensile strength and uniform elongation of 7,500 MPa% or more, and excellent weld zone toughness in a low temperature region down to -20°C; and a method for manufacturing the high-strength welded steel pipe.SOLUTION: The welded steel pipe includes a base material with a specific component composition and a weld metal with a specific component composition. The section of the base material has a micro structure in which a first phase is bainite and a second phase is island martensite dispersed in the first phase at an area ratio of 5-20% and having an average aspect ratio of 2.0 or less, while 90% or more of the island martensite is present at a prior austenite grain boundary. The section of the weld metal has a micro structure in which acicular ferrite and bainite have an area ratio of 80% or more in total and island martensite has an area ratio of 5% or less.
摘要翻译：要解决的问题：提供：API X80级（拉伸强度700MPa）以上的高强度线管的高强度焊接钢管，实现满足1.5％屈服比的优异变形性相对于1.10以上的基材的屈服强度的0.5％的强度，拉伸强度和均匀伸长率的乘积为7500MPa％以上，在低至-20℃的低温区域具有优异的焊接区韧性; 以及高强度焊接钢管的制造方法。焊接钢管包括具有特定成分组成的基材和具有特定成分组成的焊接金属。基材的截面具有微结构，其中第一相为贝氏体，第二相为分散在第一相中的岛马氏体，面积比为5-20％，平均纵横比为2.0以下，同时岛状马氏体的90％以上存在于原奥氏体晶界。焊接金属的截面具有微细结构，其中针状铁素体和贝氏体的面积率总计为80％以上，岛状马氏体的面积率为5％以下。版权所有（C）2013，JPO＆INPIT

9. 发明专利

JP2011094230A Steel sheet having low yield ratio, high strength and high uniform elongation, and method for manufacturing the same 有权
标题翻译：具有低屈服强度，高强度和高均匀性的钢板及其制造方法
公开(公告)号：JP2011094230A
公开(公告)日：2011-05-12
申请号：JP2010219757
申请日：2010-09-29
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： SHIMAMURA JUNJI , ISHIKAWA NOBUYUKI , SHIKAUCHI NOBUO
IPC分类号： C22C38/00 , B21B3/00 , C21D8/02 , C22C38/14 , C22C38/58
CPC分类号： C21D8/0226 , C21D8/0263 , C21D2211/002 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18
摘要： PROBLEM TO BE SOLVED: To provide a steel sheet having a low yield ratio, high strength, high uniform elongation, and a superior aging treatment resistance of an API 5L X70 grade or less, and to provide a method for manufacturing the same. SOLUTION: The steel sheet having the low yield ratio, high strength, high uniform elongation and superior strain aging resistance has a component composition including, by mass%, 0.06-0.12% C, 0.01-1.0% Si, 1.2-3.0% Mn, 0.015% or less P, 0.005% or less S, 0.08% or less Al, 0.005-0.07% Nb, 0.005-0.025% Ti, 0.010% or less N, 0.005% or less O and the balance Fe with unavoidable impurities; has a metallographic structure formed of a two-phase structure of bainite and island martensite, in which the area fraction of the island martensite is controlled to 3-20% and the circle equivalent diameter thereof is controlled to 3.0 μm or less; and shows a uniform elongation of 7% or more and a yield ratio of 85% or less, before and after strain aging treatment for 30 minutes or shorter at 250°C or lower. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：为了提供API 5L X70等级或更低等级的低屈服比，高强度，高均匀伸长率和优异的耐老化处理能力的钢板，并提供其制造方法。解决方案：具有低屈服比，高强度，高均匀伸长率和优异的耐应变时效性的钢板具有以质量％计含有0.06-0.12％C，0.01-1.0％Si，1.2-3.0 ％Mn，0.015％以下P，0.005％以下S，0.08％以下Al，0.005-0.07％Nb，0.005-0.025％Ti，0.010％以下N，0.005％以下O，余量Fe不可避免杂质; 具有由贝氏体和岛状马氏体的两相结构形成的金相结构，其中岛马氏体的面积分数控制在3-20％，其圆当量直径控制在3.0μm以下; 并且在250℃以下，在应变时效处理前后30分钟以上，均匀延伸率为7％以上，屈服比为85％以下。版权所有（C）2011，JPO＆INPIT

10. 发明专利

JP2010222681A Thick high toughness steel pipe stock and method for producing the same 有权
标题翻译：超高韧性钢管及其生产方法
公开(公告)号：JP2010222681A
公开(公告)日：2010-10-07
申请号：JP2009073754
申请日：2009-03-25
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： OKATSU MITSUHIRO , TANIZAWA AKIHIKO , SHIMAMURA JUNJI , ENDO SHIGERU , SHIKAUCHI NOBUO
IPC分类号： C22C38/00 , C21D8/02 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a stock for a steel pipe for a line pipe with a thickness of ≥25 mm having a strength in a grate of X70 to 100, and to provide a method for producing the same. SOLUTION: The steel pipe stock with a steel thickness of ≥25 mm having excellent toughness has a composition comprising, by mass%, 0.03 to 0.12% C, 0.01 to 0.50% Si, 1.5 to 3.0% Mn, ≤0.008% P, ≤0.0006% S, ≤0.0060% N, 0.003 to 0.100% Al, 0.0010 to 0.0030% B, 0.1 to 1.0% Ni, 0.01 to 0.5% Cr, 0.01 to 0.08% Nb and 0.005 to 0.020% Ti, and the balance Fe with inevitable impurities, and has a microstructure of the steel essentially composed of bainite, and in which the area ratio of the ferrite structure present in old austenite grain boundaries is ≤5%. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：为了提供具有X70至100的格栅强度的≥25mm厚度的管线钢管的原料，并提供其制造方法。解决方案：具有优异韧性的钢厚度≥25mm的钢管坯料具有质量％为0.03〜0.12％C，0.01〜0.50％Si，1.5〜3.0％Mn，≤0.008％ P，≤0.0006％S，≤0.0060％N，0.003〜0.100％Al，0.0010〜0.0030％B，0.1〜1.0％Ni，0.01〜0.5％Cr，0.01〜0.08％Nb和0.005〜0.020％Ti，平衡Fe与不可避免的杂质，具有基本上由贝氏体组成的钢的组织，其中存在于旧奥氏体晶界中的铁素体组织的面积比不大于5％。版权所有（C）2011，JPO＆INPIT

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