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81. 发明专利

JP2013139610A HIGH-TENSILE STRENGTH THICK STEEL SHEET HAVING TENSILE STRENGTH OF 780 MPa OR MORE, AND METHOD FOR MANUFACTURING THE SAME 有权
标题翻译：具有780MPa以上的拉伸强度的高强度强度厚钢板及其制造方法
公开(公告)号：JP2013139610A
公开(公告)日：2013-07-18
申请号：JP2012000583
申请日：2012-01-05
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： OMORI AKIO , ISHIKAWA NOBUYUKI , MATSUI ATSUMI , SUEISHI NOBUYUKI , ISHIKAWA MISAO
IPC分类号： C22C38/00 , B21B3/00 , C21D8/02 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a high-tensile strength thick steel sheet which has small deterioration in the material quality after warm working and has a tensile strength of 780 MPa or more, and to provide a method for manufacturing the same.SOLUTION: The steel sheet has a composition including, by mass, 0.06-0.12% of C, 0.05-0.40% of Si, 0.80-1.20% of Mn, 0.015% or less of P, 0.003% or less of S, 0.005-0.060% of Al, 0.0040% or less of N, 0.20-0.50% of Mo, 0.020-0.080% of V, and one or more of 0.005-0.030% of Nb, 0.10-0.50% of Cu, 0.1-1.0% of Ni, 0.10-0.80% of Cr, and 0.0003-0.0030% of B, wherein 0.45≤(Mo+4.9V+5.8Nb)≤0.85, 4.0≤Mo/V≤16.0, and 0.20≤C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B≤0.27 are satisfied. The steel sheet has a tempered martensite structure in which a microstructure has an area ratio of 80% or more and the old austenite grain diameter is 12-30 μm.
摘要翻译：要解决的问题：提供一种在热加工之后材料质量劣化小并且拉伸强度为780MPa以上的高强度高强度钢板，并提供其制造方法。解决方案：钢板的组成为：C：0.06〜0.12％，Si：0.05〜0.40％，Mn：0.80〜1.20％，P：0.015％以下，S：0.003％以下，S：0.005〜0.060％ Al：0.0040％以下，Mo：0.20〜0.50％，V：0.020〜0.080％，Nb：0.005〜0.030％，Cu：0.10〜0.50，Ni：0.10〜1.0％，0.10 -0.80％的Cr和0.0003-0.0030％的B，其中0.45≤（Mo + 4.9V + 5.8Nb）≤0.85,4.0≤Mo/V≤16.0和0.20≤C+ Si / 30 + Mn / 20 + Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 +5B≤0.27。钢板具有回火马氏体组织，其中微结构的面积率为80％以上，老奥氏体晶粒直径为12〜30μm。

82. 发明专利

JP2013023714A Welded steel pipe of low-yield-ratio and hic resistance, exhibiting excellent weld toughness after sr, and method of producing the same 有权
标题翻译：低耐蚀性和耐蚀性的焊接钢管，SR后显示优异的焊接韧性及其生产方法
公开(公告)号：JP2013023714A
公开(公告)日：2013-02-04
申请号：JP2011157607
申请日：2011-07-19
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： TANIZAWA AKIHIKO , OTSUBO HIROFUMI , MORI SHINICHIRO , OKATSU MITSUHIRO , ISHIKAWA NOBUYUKI
IPC分类号： C22C38/00 , B21C37/08 , B23K9/025 , B23K9/18 , B23K9/23 , B23K35/30 , B23K35/362 , B23K103/04 , C21D6/00 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a welded steel pipe of a low-yield-ratio and HIC resistance, exhibiting excellent weld toughness after SR (stress relief annealing), and a method of producing the same.SOLUTION: The welded steel pipe of a low-yield-ratio and HIC resistance, exhibiting excellent weld toughness after SR, includes a base material comprising Al, Ti and Ca, and further comprising at least one element selected from Cu, Ni, Cr, Mo, Nb and V, and is characterized in that Ceq is at least 0.28, PHIC is not higher than 1.00, ACR is from 1.0 to 4.0. The metal structure of the base material present in the central part in the thickness direction of the pipe includes polygonal ferrite and pseudo polygonal ferrite having a mean particle diameter of not larger than 40 μm and a mean aspect ratio of not higher than 2.0, and a second hard phase. The difference of the hardness between the polygonal ferrite and the second hard phase is from Hv 20 to 100, the weld metal part of the welded steel pipe is made of a similar metal to the base material, Pcm is at least 0.12, and PSR is not higher than 0.025.
摘要翻译：要解决的问题：提供一种低成本率和耐HIC电阻的焊接钢管，其在SR（消除应力退火）后具有优异的焊接韧性及其制造方法。解决方案：在SR之后具有优异的焊接韧性的低屈服比和HIC电阻的焊接钢管包括包含Al，Ti和Ca的基材，并且还包含至少一种选自Cu，Ni ，Cr，Mo，Nb和V，其特征在于Ceq为至少0.28，PHIC不高于1.00，ACR为1.0至4.0。存在于管的厚度方向的中央部的基材的金属结构包括平均粒径不大于40μm，平均纵横比不高于2.0的多边形铁素体和假多边形铁素体，第二硬相。多边形铁素体与第二硬质相之间的硬度差为Hv 20〜100，焊接钢管的焊接金属部分由与基材相同的金属制成，Pcm为0.12以上，PSR为不高于0.025。版权所有（C）2013，JPO＆INPIT

83. 发明专利

JP2012241268A High compressive strength steel pipe and method for producing the same 有权
标题翻译：高压强度钢管及其制造方法
公开(公告)号：JP2012241268A
公开(公告)日：2012-12-10
申请号：JP2011115444
申请日：2011-05-24
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： ISHIKAWA NOBUYUKI , SUEYOSHI HITOSHI , HORIE MASAYUKI
IPC分类号： C22C38/00 , C21D8/10 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel pipe for a thick-walled line pipe, which does not require special forming conditions in steel pipe formation and a heat treatment after pipe production, and in which the compressive strength is enhanced by optimizing the metal structure of a steel sheet.SOLUTION: The high compressive strength steel pipe includes, by mass, C, Si, Mn, P, S, Al, 0.015-0.07% of Nb, and 0.005-0.035% of Ti, wherein C(%)-0.065Nb(%) is 0.025 to 0.060, C(%)+0.67Nb(%) is ≤0.10, and the Pcm value is ≤0.20. The steel pipe is characterized in that, when the inner surface layer part and pipe thickness center part of the steel pipe in the Vickers hardness are respectively defined as HVs and HVm, HVs-HVm is ≥30, and in the metal structure, the area fraction of bainite is ≥95%.
摘要翻译：要解决的问题：提供一种用于厚管线管的钢管，其不需要在钢管形成中的特殊成形条件和管道生产之后的热处理，并且其中通过优化来提高抗压强度钢板的金属结构。解决方案：高压缩强度钢管包括C，Si，Mn，P，S，Al，Nb的0.015-0.07％和Ti的0.005-0.035％，其中C（％）-0.065 Nb（％）为0.025〜0.060，C（％）+ 0.67Nb（％）≤0.10，Pcm值≤0.20。钢管的特征在于，当维氏硬度的钢管的内表面层部分和管厚中心部分分别被定义为HV和HVm时，HVs-HVm≥30，在金属结构中，贝氏体分数≥95％。版权所有（C）2013，JPO＆INPIT

84. 发明专利

JP2012214891A Wear resistant steel plate excellent in stress corrosion cracking resistance and method for manufacturing the same 有权
标题翻译：耐磨钢板耐磨耐腐蚀性及其制造方法
公开(公告)号：JP2012214891A
公开(公告)日：2012-11-08
申请号：JP2012073808
申请日：2012-03-28
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： UEDA KEIJI , MUROTA YASUHIRO , ISHIKAWA NOBUYUKI
IPC分类号： C22C38/00 , C21D8/02 , C22C38/32 , C22C38/54
CPC分类号： C22C38/50 , C21D1/25 , C21D8/0263 , C21D8/0426 , C21D8/0463 , C21D8/0473 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48
摘要： PROBLEM TO BE SOLVED: To provide a wear resistant steel plate excellent in stress corrosion cracking resistance which is suitable for an industrial construction machine or the like.SOLUTION: The steel plate has a composition which contains, by mass%, 0.20 to 0.27% of C, 0.05 to 1.0% of Si, 0.30 to 0.90% of Mn, 0.005 to 0.025% of P, S, and Nb, 0.008 to 0.020% of Ti, 0.1% or lower of Al, and 0.0010 to 0.0060% of N, one or more of Cr, Mo, W, and B, and optionally one or more of Cu, Ni, V, REM, Ca, and Mg while controlling DI* to 45 or more with a remaining part comprising Fe and inevitable impurities where the microstructure has annealed martensite as a base phase, and Nb- and Ti-based precipitations each having a particle size in terms of a circle equivalent diameter of 0.01 to 0.5 μm or smaller are present in an amount of 2x10pieces/mmor larger. A steel slab having the steel composition as described above is heated, then subjected to hot rolling, and subjected to reheating quenching or direct quenching.
摘要翻译：要解决的问题：提供适用于工业建筑机械等的耐应力腐蚀开裂性优异的耐磨钢板。钢板的组成按质量％计含有C：0.20〜0.27％，Si：0.05〜1.0％，Mn：0.30〜0.90％，P：S：0.005〜0.025％，0.008〜0.020％的Ti，0.1％以下的Al和0.0010〜0.0060％的N，Cr，Mo，W和B中的一种以上，以及Cu，Ni，V，REM， Ca和Mg同时控制DI *至45以上，剩余部分包含Fe和不可避免的杂质，其中微结构退火马氏体为基体，Nb和Ti基析出物的粒径为圆以0.01×0.5μm以下的当量的直径存在2×10 / SP / 2以上的SPD =“POST”> 2 以上。将具有上述钢组成的钢坯加热，然后进行热轧，并进行再加热淬火或直接淬火。版权所有（C）2013，JPO＆INPIT

85. 发明专利

JP2012214890A Wear resistant steel plate excellent in stress corrosion cracking resistance and method for manufacturing the same 有权
标题翻译：耐磨钢板耐磨耐腐蚀性及其制造方法
公开(公告)号：JP2012214890A
公开(公告)日：2012-11-08
申请号：JP2012073807
申请日：2012-03-28
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： UEDA KEIJI , ISHIKAWA NOBUYUKI
IPC分类号： C22C38/00 , B21B3/02 , C21D8/02 , C22C38/32 , C22C38/54
CPC分类号： C21D8/0263 , C21D1/25 , C21D8/0426 , C21D8/0463 , C21D8/0473 , C21D2211/008 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/18 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/40 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To provide a wear resistant steel plate excellent in stress corrosion cracking resistance which is suitable for an industrial construction machine or the like.SOLUTION: The steel plate has a composition which contains, by mass%, 0.20 to 0.30% of C, 0.05 to 1.0% of Si, 0.40 to 1.20% of Mn, 0.1% or lower of P, S, and Al, 0.01% or lower of N, and 0.0003 to 0.0030% of B, contains one or more of Cr, Mo, and W, and optionally contains one or more of Nb, Ti, Cu, Ni, V, REM, Ca, and Mg while controlling DI* obtained from the components to 45 or more with a remaining part comprising Fe and inevitable impurities where the microstructure has annealed martensite as a base phase, and cementite having a particle size in terms of a circle equivalent diameter of 0.05 μm or smaller is present in an amount of 2×10pieces/mmor larger. A steel slab having the steel composition as described above is heated, then subjected to hot rolling, subjected to air cooling followed by reheating, and then subjected to accelerated cooling, or subjected to hot rolling and then immediately subjected to accelerated cooling.
摘要翻译：要解决的问题：提供适用于工业建筑机械等的耐应力腐蚀开裂性优异的耐磨钢板。钢板的组成以质量％计含有C：0.20〜0.30％，Si：0.05〜1.0％，Mn：0.40〜1.20％，P：S，Al：0.1％以下，0.01％以下的N和0.0003〜0.0030％的B含有Cr，Mo和W中的一种或多种，并且任选地含有Nb，Ti，Cu，Ni，V，REM，Ca和 Mg，同时将由组分获得的DI *控制在45以上，剩余部分包含Fe和不可避免的杂质，其中微结构退火马氏体为基体相，以及具有以当量直径为0.05μm的粒径的渗碳体，或较小的存在量为2×10 6 件/ mm 2 或更大。将具有上述钢组成的钢坯加热，然后进行热轧，然后进行空气冷却，然后再加热，然后进行加速冷却，或进行热轧，然后立即进行加速冷却。版权所有（C）2013，JPO＆INPIT

86. 发明专利

JP2012167328A High toughness uoe steel pipe excellent in collapse strength, and method for manufacturing the same 有权
标题翻译：高韧性钢管优良的拉伸强度及其制造方法
公开(公告)号：JP2012167328A
公开(公告)日：2012-09-06
申请号：JP2011029264
申请日：2011-02-15
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： TANIZAWA AKIHIKO , ISHIKAWA NOBUYUKI , OKATSU MITSUHIRO , MITAO SHINJI
IPC分类号： C22C38/00 , B21C37/08 , C21D7/12 , C21D8/02 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a welded steel pipe which can be manufactured with high productivity and is excellent in collapse strength with excellent toughness, without reducing allowable degree of pipe making and coating conditions by using a steel pipe raw material manufactured by a specific manufacturing process for a steel sheet.SOLUTION: An UOE steel pipe excellent in collapse strength contains, by mass: a specific amount of C, Si, Mn, Al, Nb; 0.005-0.040% Ti; 0.0010-0.0100% N; a specific amount of one or more selected from among Cu, Ni, Cr, Mo and V; and the balance being Fe and unavoidable impurities. The total of a ferrite phase and a bainite phase in a metallic structure is 80% or more by volume fraction, an average crystal grain size of the ferrite is 20 μm or less, and the difference in Vickers hardness between the ferrite and the bainite of the steel sheet used as the pipe raw material is 40-140. The high toughness UOE steel pipe excellent in collapse strength has a yield elongation of 0.5% or more in the circumferential direction of the steel pipe.
摘要翻译：要解决的问题：提供一种能够以高生产率制造并且具有优异的韧性优异的塌陷强度的焊接钢管，而不会通过使用由钢板的具体制造方法。解决方案：塌陷强度优异的UOE钢管质量包括：特定量的C，Si，Mn，Al，Nb; 0.005-0.040％Ti; 0.0010-0.0100％N; 选自Cu，Ni，Cr，Mo和V中的一种或多种的具体量; 余量为Fe和不可避免的杂质。金属结构中的铁素体相和贝氏体相的总和为80体积％以上，铁素体的平均结晶粒径为20μm以下，铁素体与贝氏体的维氏硬度的差为用作管材原料的钢板为40-140。塌陷强度优异的高韧性UOE钢管在钢管的圆周方向上的屈服伸长率为0.5％以上。版权所有（C）2012，JPO＆INPIT

87. 发明专利

JP2012153964A Method of manufacturing high-strength thick steel plate excellent in weldability and base material toughness 有权
标题翻译：制造高强度厚钢板在焊接性和基体材料韧性方面的优势
公开(公告)号：JP2012153964A
公开(公告)日：2012-08-16
申请号：JP2011016211
申请日：2011-01-28
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： OKATSU MITSUHIRO , ISHIKAWA NOBUYUKI , MITAO SHINJI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/16
摘要： PROBLEM TO BE SOLVED: To provide a method of manufacturing a high-strength steel that is excellent in weldability and low-temperature toughness without adding excessive alloy elements.SOLUTION: In the method of manufacturing a high-strength thick steel plate excellent in weldability and base material toughness, the steel includes, by mass%, 0.04-0.08% C, 0.01-0.5% Si, 1.0-2.0% Mn, 0.02% or less P, 0.01% or less S, 0.005-0.08% Al, 0.10-0.20% Nb, and 0.005-0.020% Ti, and further includes one or more of Cu, Ni, B, Ca, and REM and the balance being Fe and inevitable impurities. Furthermore, the steel has Pcm value of more than 0.15 and less than 0.18. After the steel is reheated at 1,100-1,300°C, it is subjected to hot rolling at a cumulative rolling ratio of 70% or more in a temperature range of 950-1,000°C, and the rolling is completed at 900°C or more. After the completion of rolling, accelerated cooling is started at a cooling rate of 10-50°C/s from a temperature range of 800°C or more, and it is stopped at a temperature of 600°C or less, and then the steel is air-cooled.
摘要翻译：要解决的问题：提供一种在不添加过量合金元素的情况下制造焊接性和低温韧性优异的高强度钢的方法。解决方案：在制造焊接性和基材韧性优异的高强度厚钢板的方法中，以质量％计含有0.04-0.08％的C，0.01-0.5％的Si，1.0-2.0％的Mn ，0.02％以下的P，0.01％以下的S，0.005-0.08％的Al，0.10-0.20％的Nb和0.005-0.020％的Ti，还包括Cu，Ni，B，Ca和REM中的一种或多种，以及余量为Fe和不可避免的杂质。此外，钢的Pcm值大于0.15且小于0.18。在1100-1300℃下再加热钢之后，在950-1,000℃的温度范围内以70％以上的累积轧制比进行热轧，在900℃以上的条件下进行轧制。轧制结束后，从800℃以上的温度范围以10-50℃/ s的冷却速度开始加速冷却，在600℃以下的温度下停止，钢是风冷的。版权所有（C）2012，JPO＆INPIT

88. 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

89. 发明专利

JP2012107332A Steel for storing high-pressure hydrogen 有权
标题翻译：用于储存高压氢的钢
公开(公告)号：JP2012107332A
公开(公告)日：2012-06-07
申请号：JP2011235739
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 , 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 ≥550 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, 0.05-0.12% C, 0.01-0.50% Si, >0.6 and ≤1.8% Mn, ≤0.02% P, ≤0.003% S, 0.01-0.08% Al, optionally ≤0.3% Cr, optionally ≤0.3% Mo, and optionally one or two or more kinds selected from Cu, Ni, Nb, V, Ti, B and Ca, with the remainder comprising Fe and incidental impurities, wherein a metal structure is a structure mainly composed of bainite whose area fraction is ≥90%, and cementite having an average particle size of ≤50 nm and an average aspect ratio of ≤3 is dispersed and deposited in the bainite.
摘要翻译：要解决的问题：提供一种具有优异的韧性和适合于在高压氢环境中使用的强度≥550MPa的抗拉强度的钢，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0.05-0.12％C，0.01-0.50％Si，> 0.6和≤1.8％Mn，≤0.02％P，≤0.003％S，0.01-0.08％Al，任选≤ 0.3％Cr，任选≤0.3％Mo，以及任意选自Cu，Ni，Nb，V，Ti，B和Ca中的一种或两种以上，余量包含Fe和附带杂质，其中金属结构是结构主要由面积率≥90％的贝氏体组成，平均粒径≤50nm，平均纵横比≤3的渗碳体分散沉积在贝氏体中。版权所有（C）2012，JPO＆INPIT

90. 发明专利

JP2012077325A High strength steel sheet for line pipe and method for producing the same, and high strength steel pipe using high strength steel sheet for line pipe 有权
标题翻译：用于管线的高强度钢板及其制造方法，以及使用高强度钢管的管线管的高强度钢管
公开(公告)号：JP2012077325A
公开(公告)日：2012-04-19
申请号：JP2010221496
申请日：2010-09-30
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： SUEYOSHI HITOSHI , ISHIKAWA NOBUYUKI , SUWA MINORU , SHIKAUCHI NOBUO , NAKADA NAOKI , KUROKI TAKASHI
IPC分类号： C22C38/00 , B21B3/00 , B21B45/02 , B21B45/08 , C21D8/02 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength steel sheet for a line pipe, having effectively reduced variations in hardness in the sheet thickness direction and the sheet width direction of the steel sheet, and thereby having improved material uniformity in the steel sheet.SOLUTION: A high strength steel sheet for a line pipe comprises a composition containing, by mass%, 0.03 to 0.12% C, 0.01 to 0.5% Si, 1.5 to 3.0% Mn, 0.01% or less P, 0.002% or less S and 0.01 to 0.08% Al, with the balance of Fe and unavoidable impurities, while a Ceq value represented by the following formula (1) is 0.33 or more. In the high strength steel sheet, the steel structure is a bainitic structure, and each of variations in hardness in the sheet thickness direction and the sheet width direction is 50 or less in Vickers hardness variation ΔHV. Ceq (mass%)=[%C]+[%Mn]/6+([%Cu]+[%Ni])/15+([%Cr]+[%Mo]+[%V])/5...(1), wherein [%X] represents the content (mass%) of X element in the steel.
摘要翻译：要解决的问题：为了提供一种用于管线管的高强度钢板，有效地减少了钢板的厚度方向和板宽度方向上的硬度变化，从而提高了钢的材料均匀性片。解决方案：用于管线管的高强度钢板包括以质量％计含有0.03-0.12％C，0.01-0.5％Si，1.5-3.0％Mn，0.01％或更少的P，0.002％或较小的S和0.01〜0.08％的Al，其余为Fe和不可避免的杂质，而由下式（1）表示的Ceq值为0.33以上。在高强度钢板中，钢结构是贝氏体组织，维氏硬度变化ΔHV中，板厚方向和板宽方向的硬度的变化各自为50以下。 Ceq（质量％）= [％C] + [％Mn] / 6 +（[％Cu] + [％Ni]）/ 15 +（[％Cr] + [％Mo] + [％V] ...（1）其中[％X]表示钢中X元素的含量（质量％）。版权所有（C）2012，JPO＆INPIT

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