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1. 发明专利

JP2014077642A Estimation method of hic sensitivity of steel material and manufacturing method of high strength thick steel plate for line pipe superior in anti hic performance using the same 审中-公开
标题翻译：钢质材料的HIC敏感度的估计方法和高强度厚钢板的制造方法，用于使用相同的HIC性能的管线管
公开(公告)号：JP2014077642A
公开(公告)日：2014-05-01
申请号：JP2012223828
申请日：2012-10-09
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： NAKAMICHI JIRO , NISHIMURA KIMIHIRO , TANIZAWA AKIHIKO
IPC分类号： G01N23/225 , B22D11/00 , C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide an estimation method of HIC sensitivity of steel material and a manufacturing method of high strength thick steel plate for line pipe superior in anti HIC performance using the same.SOLUTION: Mn concentration is analyzed on an area including a central segregation portion on a steel material and the results thereof are mapped. Defining a continuous region of the steel material where Mn is concentrated 1.3 times of Mn concentration Cof the steel material as a Mn segregation spot based on the analysis and mapping result, a major axis DL of the Mn segregation spot and a ratio of average Mn concentration Cof the Mn segregation spot to Mn concentration Cof the steel material (Mn segregation degree) C/Care examined. The distribution of Mn segregation spots where the product of DL(mm) and the Mn segregation degree C/Cexceeds 0.8 (mm) are calculated. When the number of Mn segregation spots found in a unit length of 100 mm is one or less in a width direction of the steel material, the steel material is evaluated as a steel material superior in anti HIC performance.
摘要翻译：要解决的问题：提供钢材的HIC灵敏度的估计方法和使用其的抗HIC性能优异的管线管的高强度厚钢板的制造方法。解决方案：在包括中心的区域上分析Mn浓度绘制钢材上的偏析部分及其结果。定义锰浓度为Mn浓度的1.3倍的连续区域Mn浓度的1.3倍根据分析映射结果，作为Mn偏析点的钢材，通过Mn偏析点的长轴DL和平均Mn浓度比将Mn偏析点与Mn浓度Cof对应的钢材（Mn偏析度）C / Care检查。计算DL（mm）和Mn偏析度C / Cexceeds 0.8（mm）的乘积的Mn偏析点的分布。当单位长度为100mm的Mn偏析点的数量在钢材的宽度方向上为一个以下时，钢材被评价为抗HIC性能优异的钢材。

2. 发明专利

JP2013190319A Evaluation method of hic resistance of steel material and manufacturing method for high strength thick steel plate for line pipe using the same 有权
标题翻译：钢管材料耐蚀性评价方法及其制造方法高强度厚钢板的使用方法
公开(公告)号：JP2013190319A
公开(公告)日：2013-09-26
申请号：JP2012056649
申请日：2012-03-14
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： NAKAMICHI JIRO , NISHIMURA KIMIHIRO , TANIZAWA AKIHIKO , JODAI TETSUSHI
IPC分类号： G01N33/20 , C21D8/02 , C22C38/00 , C22C38/14 , C22C38/50 , C22C38/54 , G01N21/68
摘要： PROBLEM TO BE SOLVED: To provide an evaluation method of HIC resistance of a steel material and a manufacturing method for a thick steel plate using the same.SOLUTION: An HIC resistance evaluation method includes the steps of: identifying a center segregation part of a steel material to be evaluated; using a high frequency combustion-ultraviolet fluorescence method to analyze S density of a micro region including the center segregation part; and estimating that the steel material has a higher risk of causing HIC and has lowered HIC resistance when the S density exceeds a predetermined value. When the steel material falls under a thick steel plate, the HIC resistance is evaluated through the steps of: measuring microhardness HV first; and analyzing the S density of a portion with the microhardness HV equal to and greater than 230. If this HIC resistance evaluation method for the steel material is applied in a state of steel raw material and a thick steel plate is manufactured using only cast slabs estimated to have excellent HIC resistance as the steel raw material, it is possible to stably manufacture the thick steel plate with excellent HIC resistance. Furthermore, if the HIC resistance of the manufactured thick steel plate is evaluated and the thick steel plate estimated to have excellent HIC resistance is selected as one for a line pipe, it is possible to manufacture the thick steel plate with excellent HIC resistance.
摘要翻译：要解决的问题：提供钢材的HIC电阻的评价方法以及使用其的厚钢板的制造方法。解决方案：HIC电阻评价方法包括以下步骤：识别钢的中心偏析部分待评估材料; 使用高频燃烧 - 紫外线荧光法分析包括中心偏析部分在内的微区域的S密度; 并且当S密度超过预定值时，估计钢材具有导致HIC的较高风险并降低HIC电阻。当钢材落在厚钢板下时，通过以下步骤评估HIC电阻：首先测量显微硬度HV; 并且用显微硬度HV等于或大于230的部分的S密度进行分析。如果钢材的HIC电阻评估方法以钢原材料的状态应用，并且仅使用铸造板制造厚钢板作为钢原材料具有优异的耐HIC电阻，可以稳定地制造具有优异HIC电阻的厚钢板。此外，如果评价制造的厚钢板的HIC电阻，并且将被评估为具有优异的耐HIC电阻的厚钢板选择为管线管的HIC电阻，则可以制造具有优异HIC电阻的厚钢板。

3. 发明专利

JP2013145221A Steel material having low risk of hic crack and central segregation part evaluation method thereof 有权
标题翻译：具有HIC裂纹和中心分割的低风险的钢材料部分评估方法
公开(公告)号：JP2013145221A
公开(公告)日：2013-07-25
申请号：JP2012223034
申请日：2012-10-05
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： NAKAMICHI JIRO , NISHIMURA KIMIHIRO , OKATSU MITSUHIRO
IPC分类号： G01N33/20 , C22C38/00 , C22C38/50 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a method for evaluating and determining the HIC crack sensitivity of a slab and a steel plate by measuring an Mn concentration distribution and taking the influence of content and a segregation degree into consideration.SOLUTION: A method evaluates anti-hydrogen crack sensitivity of a steel plate by using all Q values measured and calculated in each basic measurement area defined by the following expression (1) composed of the element content of a steel material and an Mn segregation degree of a central segregation part. Q=Cf+Cf/6+(Cf+Cf+Cf)/5+(Cf+Cf)/15+Cf/4+2Cf....expression (1). In this case, f represents an Mn segregation degree in a segregation part, and a value defined by (C/C), Crepresents Mn concentration obtained by measuring an Mn concentration distribution of the central segregation part with a cross section of the steel material in a width direction, Crepresents average concentration of Mn concentration, N of frepresents an exponentiation, and Crepresents the content (mass%) of an element i, respectively.
摘要翻译：要解决的问题：提供一种通过测量Mn浓度分布并考虑含量和偏析程度的影响来评估和确定板坯和钢板的HIC裂纹敏感性的方法。解决方案：通过使用由由钢材的元素含量和中心偏析部分的Mn偏析度构成的由以下表达式（1）定义的每个基本测量区域中测量和计算的所有Q值，对钢板的氢裂纹敏感性。 Q = Cf + Cf / 6 +（Cf + Cf + Cf）/ 5 +（Cf + Cf）/ 15 + Cf / 4 + 2Cf ....表达式（1）。在这种情况下，f表示偏析部分的Mn偏析度，由（C / C）定义的值表示通过以钢材的横截面测定中心偏析部的Mn浓度分布而得到的Mn浓度宽度方向，克数表示Mn浓度的平均浓度，N表示取幂，crep表示元素i的含量（质量％）。

4. 发明专利

JP2013124398A Steel sheet for high strength sour resistant line pipe, and material therefor 有权
标题翻译：用于高强度耐酸性线管及其材料的钢板
公开(公告)号：JP2013124398A
公开(公告)日：2013-06-24
申请号：JP2011274111
申请日：2011-12-15
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： NAKAMICHI JIRO , NISHIMURA KIMIHIRO , OKATSU MITSUHIRO
IPC分类号： C22C38/00 , B21B3/00 , C21D8/02 , C22C38/50 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a steel sheet or a steel slab for a high strength sour resistant line pipe, for which a concentration mapping analysis in a region including the center segregation part is carried out for center segregation of continuously cast slab and a thick steel sheet, and a correlation between the center segregation and the risk rate of crack of the steel sheet is obtained.SOLUTION: The steel sheet or the steel slab for the high strength sour resistant line pipe is characterized in that the steel slab contains 0.03-0.07% C, 0.01-0.5% Si, 0.8-1.5% Mn, ≤0.07% Al, ≤0.010% P, ≤0.001% S and Ti, Nb, Ca, N, O and further, one or more kinds selected from among Cu, Ni, Cr, Mo, V; and three or less pieces of Mn-concentrated spots approximate to an elliptical shape are present in a measurement region of ±5 mm in the thickness direction per 100 mm length in the width direction of the steel sheet with the center part (t/2 part: t is the thickness of the steel sheet) of the cross section of the steel sheet vertical to the casting direction as a center, and the length of a major axis of the Mn concentrated spot exceeds >1.5 mm, and the Mn concentration is ≥1.6%.
摘要翻译：要解决的问题：为了提供一种用于高强度耐酸性管线管的钢板或钢板，其中对包括中心偏析部分的区域进行浓度映射分析，用于连续铸造板坯的中心偏析和厚钢板，并且获得了钢板的中心偏析与裂纹危险率之间的相关性。解决方案：用于高强度耐酸管线管的钢板或钢板的特征在于钢板含有0.03-0.07％的C，0.01-0.5％的Si，0.8-1.5％的Mn，≤0.07％的Al ，≤0.010％P，≤0.001％S，Ti，Nb，Ca，N，O，以及选自Cu，Ni，Cr，Mo，V中的一种或多种; 在与中心部分（t / 2部分）的钢板的宽度方向上的每100mm长度的厚度方向的±5mm的测量区域中存在三个以下的近似于椭圆形的Mn浓缩点：t为钢板的厚度）为钢板垂直于铸造方向的截面为中心，Mn浓点的长轴长度超过1.5mm，Mn浓度≥ 1.6％。版权所有（C）2013，JPO＆INPIT

5. 发明专利

JP2013250113A Determination method for hic resistance performance of steel material 审中-公开
标题翻译：钢材材料耐蚀性能测定方法
公开(公告)号：JP2013250113A
公开(公告)日：2013-12-12
申请号：JP2012124147
申请日：2012-05-31
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： TANIZAWA AKIHIKO , NAKAMICHI JIRO , KOIKE YASUFUMI , MAEDA HISAFUMI , NISHIMURA KIMIHIRO
IPC分类号： G01N33/20 , C21D8/02 , C22C38/00 , C22C38/06 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To provide a determination method for HIC resistance performance of a steel material that predicts whether a TMCP unrefined thick high-strength steel plate used suitably for a pipeline or a UOE steel pipe using the steel plate as a blank passes an HIC test.SOLUTION: There is provided a determination method for HIC resistance performance of a steel material that predicts whether a TMCP unrefined thick high-strength steel plate used suitably for a pipeline or a UOE steel pipe using the steel plate as a blank passes an HIC test, the HIC resistance performance being determined by setting, as determination items, (1) chemical component analysis of the steel plate or UOE steel pipe, (2) rolling/cooling conditions (actual results) (or rolling condition actual results of the steel plate as a blank for the UOE steel pipe), and (3) ultrasonic flaw detection nearby a surface layer, and comparing values obtained by the determination items with preset criteria.
摘要翻译：要解决的问题：为了提供钢材的HIC电阻性能的判定方法，该钢材预测是否适合用于管道的TMCP未精制厚厚的高强度钢板或使用钢板作为空白的UOE钢管是否通过HIC 测试。解决方案：提供了一种钢材的HIC电阻性能测定方法，该方法预测了适用于管道的TMCP未精制厚厚高强度钢板或使用钢板作为空白的UOE钢管是否通过HIC 测试中，HIC阻力性能通过设定决定项目确定，（1）钢板或UOE钢管的化学成分分析，（2）轧制/冷却条件（实际结果）（或轧制条件钢的实际结果板作为UOE钢管的空白），和（3）表面层附近的超声波探伤，并将确定项目获得的值与预设标准进行比较。

6. 发明专利

JP2011099130A HIGH-STRENGTH STEEL SHEET HAVING TENSILE STRENGTH OF 1,500 MPa OR MORE, AND METHOD FOR MANUFACTURING THE SAME 有权
标题翻译：具有1500MPa以上的拉伸强度的高强度钢板及其制造方法
公开(公告)号：JP2011099130A
公开(公告)日：2011-05-19
申请号：JP2009252670
申请日：2009-11-04
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： MIZUNO REIKO , MATSUDA HIROSHI , NAKAMICHI JIRO , FUNAKAWA YOSHIMASA , TANAKA YASUSHI
IPC分类号： C22C38/00 , B21B1/22 , C21D9/48 , C22C38/06 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To provide a high-strength steel sheet having a tensile strength of 1,500 MPa or more, which is excellent in bendability and delayed fracture resistance in a rolling direction and in a direction perpendicular to the rolling direction, and to provide a method for manufacturing the same. SOLUTION: In the high-strength steel sheet, in the main phase structure, ferrite and carbides form layers, further, the aspect ratio of the carbide is 10 or more, and a layered structure in which the pitch of the layers is 50 nm or less occupies 65% or more by a volume fraction with respect to the whole structure. Further, the fraction of the carbides which have the aspect ratio of 10 or more and an angle of 45° or less with respect to the rolling direction among the carbides is 30 to 60% by an area rate. The steel sheet is obtained by cold-rolling a steel sheet having a structure in which a pearlitic structure is a main phase, a ferrite phase in the rest of the whole structure occupies 20% or less by a volume fraction with respect to the whole structure, and a lamellar pitch in the pearlite structure is 500 nm or less, and having Vickers hardness of ≥200 HV by cross rolling of repeatedly performing rolling while rolling the steel sheet by 90° in the rolling direction, at a rolling rate of 70% or more. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供一种拉伸强度为1500MPa以上的高强度钢板，其在轧制方向和与轧制方向垂直的方向上的弯曲性和延迟断裂性优异，以及以提供其制造方法。解决方案：在高强度钢板中，在主相结构中，铁素体和碳化物形成层，此外，碳化物的纵横比为10以上，层的间距为相对于整体结构，50nm以下的体积分数占65％以上。此外，相对于碳化物中的轧制方向，纵横比为10以上，角度为45°以下的碳化物的比例为面积率为30〜60％。钢板通过冷轧具有珠光体组织为主相的结构的钢板而获得，整个结构的其余部分的铁素体相相对于整体结构体积分数占20％以下，珠光体组织中的层状沥青为500nm以下，通过在轧制方向上以轧制方向轧制90°，反复进行轧制的横向轧制，维氏硬度≥200HV，轧制速度为70％或者更多。版权所有（C）2011，JPO＆INPIT

7. 发明专利

JP2010023106A Weld metal for stainless steel welded joint, and method for evaluating corrosion resistance thereof 有权
标题翻译：用于不锈钢焊接接头的焊接金属及其耐腐蚀性评估方法
公开(公告)号：JP2010023106A
公开(公告)日：2010-02-04
申请号：JP2008190439
申请日：2008-07-24
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： YANO HIROSHI , NAKAMICHI JIRO , OKADA SHUJI , KAWABATA FUMIMARU , OI KENJI , YAMADA KATSUMI
IPC分类号： B23K35/30 , B23K9/23 , B23K31/00 , B23K103/04 , B23K103/18 , C21D9/46 , C22C38/00 , C22C38/50 , G01N17/00 , G01N23/225 , G01N33/20
摘要： PROBLEM TO BE SOLVED: To provide a weld metal having excellent corrosion resistance in a different material welded joint between a ferritic stainless steel sheet and an austenitic stainless steel sheet, and to provide a method for evaluating its corrosion resistance.
SOLUTION: The weld metal for a dissimilar welded joint with stainless steel includes, by mass, 18 to 21% Cr, ≤0.1% Mo, ≤0.5% Cu, 0.03 to 0.25% Nb, ≤0.05% Ti and ≤0.04% N, and in which a difference between the minimum value of the Cr concentration on the ferritic phase side in the grain boundaries or in the vicinities of the grain boundaries and the Cr concentration of the ferritic phase in the mother phase is ≤10 mass%, and also, a difference between the minimum value of the Cr concentration on the austenitic phase side in the vicinities of the grain boundaries and the Cr concentration of the austenitic phase in the mother phase is ≤5 mass%. Also, the method for evaluating the corrosion resistance evaluates corrosion resistance by the difference between the minimum value of the Cr concentration on the ferritic phase side in the grain boundaries or in the vicinities of the grain boundaries and/or the difference between the minimum value of the Cr concentration on the austenitic phase side in the vicinities of the grain boundaries and the Cr concentration of the austenitic phase in the mother phase.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供在铁素体不锈钢板和奥氏体不锈钢板之间的不同材料焊接接头中具有优异耐腐蚀性的焊接金属，并提供一种评价其耐腐蚀性的方法。解决方案：用于不锈钢焊接接头的焊接金属质量分别为18〜21％Cr，≤0.1％Mo，≤0.5％Cu，0.03〜0.25％Nb，≤0.05％Ti，≤0.04 ％N，并且其中在晶界中的铁素体相侧的Cr浓度与晶界附近的Cr浓度与母相的铁素体相的Cr浓度之间的差为≤10质量％，并且在晶界附近的奥氏体相侧的Cr浓度与母相的奥氏体相的Cr浓度的最小值之差为5质量％以下。此外，耐腐蚀性评价方法是通过晶粒边界内的铁素体相侧的Cr浓度的最小值或晶界附近的/ Cr的最小值和在晶界附近的奥氏体相侧的Cr浓度和母相中的奥氏体相的Cr浓度。版权所有（C）2010，JPO＆INPIT

8. 发明专利

JP2009138276A Design method for precipitation-strengthened high-strength steel sheet, production method therefor, and precipitation-strengthened high-strength steel sheet 审中-公开
标题翻译：降低强化高强度钢板的设计方法，其生产方法和降低强度的高强度钢板
公开(公告)号：JP2009138276A
公开(公告)日：2009-06-25
申请号：JP2009007547
申请日：2009-01-16
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： SATO KAORU , NAKAMICHI JIRO , SUWA MINORU , FUNAKAWA YOSHIMASA
IPC分类号： C22C38/00 , C21D6/00 , C21D8/02 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a design method for a precipitation-strengthened high-strength steel sheet by which a steel designing is efficiently and theoretically performed when producing the objective steel sheet by compositely adding carbide-generating elements, and to provide a method for production of the above steel sheet, and such a precipitation-strengthened high-strength steel sheet.
SOLUTION: When designing the precipitation-strengthened high-strength steel sheet with carbide precipitated in a steel structure, one or more of a first metal element M1 to generate MC-type carbide with the electronegativity of
摘要翻译：要解决的问题：提供一种沉淀强化高强度钢板的设计方法，通过在通过复合加入碳化物产生元素制造目标钢板时有效和理论地进行钢设计，并提供上述钢板的制造方法和这样的析出强化型高强度钢板。解决方案：当在钢结构中沉淀的碳化物设计沉淀强化的高强度钢板时，一个或多个第一金属元素M1产生电负性<1.8的MC型碳化物，以及一个或多个选择电负性≥1.8的第二金属元素M2作为构成碳化物的金属元素，使得第一和第二金属元素M1和M2之间的原子半径差<10％，然后加法确定元素M1，M2和C的量以产生包含第一和第二金属元素M1和M2的碳化物。版权所有（C）2009，JPO＆INPIT

9. 发明专利

JP2013119658A HIGH STRENGTH WELDED STEEL PIPE EXCELLENT IN SULFIDE STRESS CORROSION CRACKING RESISTANCE AND HAVING TENSILE STRENGTH OF 600 MPa OR MORE 有权
标题翻译：高强度焊接钢管在硫应力腐蚀中具有优异的抗裂性和600 MPa以上的拉伸强度
公开(公告)号：JP2013119658A
公开(公告)日：2013-06-17
申请号：JP2011268639
申请日：2011-12-08
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： OKATSU MITSUHIRO , NISHIMURA KIMIHIRO , NAKAMICHI JIRO
IPC分类号： C22C38/00 , B21B3/00 , B21C37/08 , B23K9/025 , B23K9/18 , B23K9/23 , B23K35/30 , B23K103/04 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength welded steel pipe excellent in HIC (Hydrogen Induced Cracking) resistance and SSC (Sulfide Stress corrosion Cracking) resistance, particularly, SSC resistance not only in steel pipe but also in circumferential welded part of steel pipes with each other.SOLUTION: The high strength welded steel pipe excellent in sulfide stress corrosion cracking resistance and having a tensile strength of 600 MPa or more satisfies: a CP value, obtained from a specified formula which is a function of a chemical composition of a mother material, of ≤1.1; a Py value, obtained by another formula, of ≤0.175; and a Py value, calculated by a chemical composition of a welded metal, of ≤0.175, wherein the area of an inner surface welded metal portion is 2.5 times or more the area of an outer surface welded metal portion.
摘要翻译：要解决的问题：提供HIC（氢诱发开裂）电阻和SSC（硫化物应力腐蚀开裂）电阻优异的高强度焊接钢管，特别是不仅在钢管中，而且在周向焊接部分的钢管彼此。解决方案：耐硫化物应力腐蚀开裂性优异，拉伸强度为600MPa以上的高强度焊接钢管，满足从作为母体的化学成分的函数的规定式得到的CP值材料，≤1.1; 通过另一个公式获得的Py值≤0.175; 和通过焊接金属的化学组成计算的Py值≤0.175，其中内表面焊接金属部分的面积是外表面焊接金属部分的面积的2.5倍或更多。版权所有（C）2013，JPO＆INPIT

10. 发明专利

JP2011074403A Steel for high heat input welding 有权
标题翻译：用于高热输入焊接的钢
公开(公告)号：JP2011074403A
公开(公告)日：2011-04-14
申请号：JP2009214209
申请日：2009-09-16
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： YOKOTA TOMOYUKI , NAKAMICHI JIRO , YAMASHITA TAKAKO , NISHIMURA KIMIHIRO
IPC分类号： C22C38/00 , C21D8/02 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel for high heat input welding which has excellent weld heat affected zone toughness by high heat input welding in which heat input exceeds 300 kJ/cm. SOLUTION: The steel satisfies Ceq(IIW)(=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15): 0.33 to 0.45, and has a componential composition comprising, by mass, 0.03 to 0.08% C, 0.01 to 0.15% Si, 1.5 to 2.6% Mn, 0.005 to 0.1% P, S, Al, 0.003 to 0.05% Nb, 0.003 to 0.03% Ti, 0.0025 to 0.0070% N, 0.0003 to 0.0025% B and 0.0005 to 0.0030% Ca, and, if required, comprising one or more kinds selected from V, Cr, Mo, Mg, Zr and REM, and the balance Fe with inevitable impurities, and in which sulfides including Mn and Ca in the range of 0.1 to 0.7 by Mn/(Mn+Ca): Mn/(Mn+Ca) in mass ratio or the sulfides compounded with oxides are dispersed at the size of 0.1 to 5 μm by 50 to 1,000 pieces in 1 mm 2 . COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供一种高热输入焊接用钢，其通过热输入超过300kJ / cm的高热输入焊接具有优异的焊接热影响区韧性。解决方案：钢满足Ceq（IIW）（= C + Mn / 6 +（Cr + Mo + V）/ 5 +（Cu + Ni）/ 15）：0.33至0.45，并且具有组成成分，，0.03〜0.08％的C，0.01〜0.15％的Mn，1.5〜2.6％的Mn，0.005〜0.1％的P，S，Al，0.003〜0.05％的Nb，0.003〜0.03％的Ti，0.0025〜0.0070％的N，至0.0025％B和0.0005〜0.0030％的Ca，如果需要，可以包含选自V，Cr，Mo，Mg，Zr和REM中的一种或多种，余量为Fe和不可避免的杂质，其中包括Mn和 Mn /（Mn + Ca）：Mn /（Mn + Ca）的质量比为0.1〜0.7的Ca或与氧化物复合的硫化物以0.1〜5μm的大小分散在1〜毫米 2 。版权所有（C）2011，JPO＆INPIT

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