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1. 发明专利

JP2014062333A Low yield ratio dual phase steel linepipe with superior strain aging resistance 有权
标题翻译：具有超耐应变抗老化性能的低合金钢双相钢带
公开(公告)号：JP2014062333A
公开(公告)日：2014-04-10
申请号：JP2014002721
申请日：2014-01-09
申请人： Exxonmobil Upstram Research Company , エクソンモービルアップストリームリサーチカンパニー , Jfe Steel Corp , Jfeスチール株式会社
发明人： KOO JAYOUNG , NARASIMHA V BANGARU , JIN HYUN-WOO , ADNAN OZEKCIN , RAGHAVAN AYER , DOUGLAS P FAIRCHILD , DANNY L BEESON , DOUGLAS S WHYTE , JAMES B LEBLEU JR , ENDO SHIGERU , OKATSU MITSUHIRO , KAKIHARA SHINICHI , NAGAE MORIYASU
IPC分类号： C22C38/00 , C21D8/02 , C22C38/38 , C22C38/58
CPC分类号： C22C38/12 , C21D8/0205 , C21D8/0226 , C21D9/085 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/08 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To provide a low yield ratio dual phase steel linepipe with superior strain aging resistance.SOLUTION: In at least one embodiment, a dual phase steel comprises by a weight ratio: carbon in an amount of about 0.05 wt.% to about 0.12 wt.%; niobium in an amount of about 0.005 wt.% to about 0.03 wt.%; titanium in an amount of about 0.005 wt.% to about 0.02 wt.%; nitrogen in an amount of about 0.001 wt.% to about 0.01 wt.%; silicon in an amount of about 0.01 wt.% to about 0.5 wt.%; manganese in an amount of about 0.5 wt.% to about 2.0 wt.%; and molybdenum, chromium, vanadium and copper in a total amount less than about 0.15 wt.%. The steel has a first phase comprising ferrite and a second phase comprising one or more constituents selected from the group consisting of carbide, pearlite, martensite, lower bainite, granular bainite, upper bainite, and degenerate upper bainite.
摘要翻译：要解决的问题：提供具有优异的应变耐老化性的低屈服比双相钢管线管。解决方案：在至少一个实施方案中，双相钢包含重量比：约0.05重量％至约0.05重量％的碳，约0.12重量％; 约0.005重量％至约0.03重量％的铌; 量为约0.005重量％至约0.02重量％的钛; 量为约0.001重量％至约0.01重量％的氮; 量为约0.01重量％至约0.5重量％的硅; 约0.5重量％至约2.0重量％的量的锰; 和钼，铬，钒和铜的总量小于约0.15重量％。所述钢具有包含铁素体的第一相和包含选自碳化物，珠光体，马氏体，下贝氏体，粒状贝氏体，上贝氏体和退化的上贝氏体的一种或多种组分的第二相。

2. 发明专利

JP2010248621A Method for manufacturing high-strength high-toughness steel 有权
标题翻译：制造高强度高韧性钢的方法
公开(公告)号：JP2010248621A
公开(公告)日：2010-11-04
申请号：JP2010062444
申请日：2010-03-18
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： HAYASHI KENJI , YOKOTA TOMOYUKI , OKATSU MITSUHIRO , OI KENJI , SHIKAUCHI NOBUO
IPC分类号： C21D8/02 , C21D8/06 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a manufacturing method for obtaining fine austenite grain diameter without needing reheating and quenching.
SOLUTION: In the method for manufacturing the high-strength high-toughness stee, a steel material having the composition containing, by mass, 0.01-0.30% C, 0.01-0.80% Si, 0.20-2.50% Mn, ≤0.020% P, ≤0.0070% S, 0.003-0.100% sol.Al and the balance Fe with inevitable impurities is heated to ≥1,000°C, and the rolling is performed in austenite recrystallizing temperature zone, then the rolling is performed at ≥40% accomulated rolling-reduction ratio in the non-austenite-recrystallized temperature zone. Thereafter, the rolled steel is heated at the temperature raising speed of ≥2°C/sec from the Ar
3 transforming point or higher to the austenite recrystallized temperature zone, and further, this steel is accelerating-cooled from the Ar
3 transforming point or higher to ≤600°C.
COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：待解决的问题：提供一种获得细奥氏体晶粒直径而不需要再加热和淬火的制造方法。解决方案：在高强度高韧度钢的制造方法中，具有质量含有0.01-0.30％C，0.01-0.80％Si，0.20-2.50％Mn，≤0.020 ％P，≤0.0070％S，0.003-0.100％sol.Al，将余量为Fe的不可避免的杂质加热至≥1,000℃，并在奥氏体再结晶温度区进行轧制，然后进行≥40％在非奥氏体 - 再结晶温度区中的压缩减少率。然后，将轧制钢从Ar 3 转变点以上的升温速度加热至奥氏体再结晶温度区域，进而将该钢加速冷却从Ar 3 转换点或更高至≤600°C。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

JP2014012890A Low alloy high strength seamless steel pipe for oil well having excellent sulfide stress corrosion cracking resistance and its manufacturing method 有权
标题翻译：低合金高强度无缝钢管，具有优异的硫酸应变腐蚀开裂电阻及其制造方法
公开(公告)号：JP2014012890A
公开(公告)日：2014-01-23
申请号：JP2013118441
申请日：2013-06-05
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： EGUCHI KENICHIRO , ISHIGURO YASUHIDE , OKATSU MITSUHIRO , SUGANO YOSHIYUKI , MIYATA YUKIO
IPC分类号： C22C38/00 , C21D9/08 , C22C38/32 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a low alloy high strength seamless steel pipe for an oil well having excellent sulfide stress corrosion cracking resistance and its manufacturing method.SOLUTION: A seamless steel pipe contains a composition comprising, by mass%, C:0.15 to 0.50%, Si:0.1 to 1.0%, Mn:0.3 to 1.0%, P:0.015% or less, S:0.005% or less, Al:0.01 to 0.10%, N:0.01% or less, Cr:0.1 to 1.7%, Mo:0.4 to 1.1%, V:0.01 to 0.12%, Nb:0.01 to 0.08%, Ti:0.005 to 0.03% and B:0.0005 to 0.0030% and has each segregation degree of Mn, Mo and Cr in a segregation part of 1.5 or less. A manufacturing method of the seamless steel pipe includes applying, to the seamless steel pipe, segregation lowering treatment for heating the seamless steel pipe at T (°C) in range of 1100°C to 1300°C and maintaining for a definite period of time and then cooling it, and thereafter, applying hardening treatment one or more times and then tempering treatment.
摘要翻译：要解决的问题：提供一种具有优异的耐硫化物应力腐蚀开裂性的油井的低合金高强度无缝钢管及其制造方法。无缝钢管含有以质量％计含有C：0.15〜 0.50％，Si：0.1〜1.0％，Mn：0.3〜1.0％，P：0.015％以下，S：0.005％以下，Al：0.01〜0.10％，N：0.01％以下，Cr：0.1〜1.7 ％，Mo：0.4〜1.1％，V：0.01〜0.12％，Nb：0.01〜0.08％，Ti：0.005〜0.03％，B：0.0005〜0.0030％，偏析Mn，Mo，Cr的偏析度部分为1.5以下。无缝钢管的制造方法包括向无缝钢管施加在1100℃〜1300℃的T（℃）下加热无缝钢管的偏析降低处理，并保持一定时间然后冷却，然后进行一次或多次硬化处理，然后进行回火处理。

5. 发明专利

JP2013204103A High strength welded steel pipe for low temperature use having superior buckling resistance, and method for producing the same, and method for producing steel sheet for high strength welded steel pipe for low temperature use having superior buckling resistance 审中-公开
标题翻译：用于具有高耐磨性的低温用高强度焊接钢管及其制造方法以及用于生产高强度焊接钢管的钢板的方法，用于具有优异的耐磨性的低温用途
公开(公告)号：JP2013204103A
公开(公告)日：2013-10-07
申请号：JP2012075384
申请日：2012-03-29
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： SHIMAMURA JUNJI , NISHIMURA KIMIHIRO , OKATSU MITSUHIRO
IPC分类号： C22C38/00 , B21C37/08 , B23K9/025 , B23K9/23 , B23K31/00 , B23K35/30 , B23K103/04 , C21D7/12 , C21D8/02 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength steel pipe of API X100 grade, superior in buckling resistance and toughness at low temperatures after coating treatment, a method for producing the high strength steel pipe, and a method for producing a steel sheet serving as a base material.SOLUTION: In a steel pipe, a base material includes, by mass%, more than 0.03% and 0.08% or less of C, 0.01-0.5% of Si, 1.5-3.0% of Mn, 0.01-0.08% of P, S and Al, 0.005-0.025% of Nb, 0.005-0.025% of Ti, 0.001-0.010% of N, 0.005% or less of O, and one or two or more of Cu, Ni, Cr, Mo, V and B, with 0.19≤P≤0.25 and the remainder being Fe and inevitable impurities, has a TS of 760-930 MPa, a uniform elongation of 5% or more and a YR of 85% or less; the micro structure of the base material mainly comprises bainite including island martensite, and includes 1-10% of a lower part bainite and 3% or less of residual austenite; seam welding by submerged arc welding is performed at a heat-input of 80 kJ/cm or less; and seam welding metal has a specified component composition.
摘要翻译：要解决的问题：为了提供API X100级的高强度钢管，在涂布处理后的低温下的抗弯曲性和韧性优异的高强度钢管的制造方法以及用作钢板的钢板的制造方法基体材料。在钢管中，基体材料以质量％计含有C：0.03％以上0.08％以下，Si：0.01-0.5％，Mn：1.5〜3.0％，0.01-0.08％的P，S和Al，0.005-0.025％的Nb，0.005-0.025％的Ti，0.001-0.010％的N，0.005％以下的O，以及一种或两种以上的Cu，Ni，Cr，Mo， V和B为0.19≤P≤0.25，其余为Fe和不可避免的杂质，TS为760-930MPa，均匀伸长率为5％以上，YR为85％以下。基体的微结构主要包括包含岛马氏体的贝氏体，并且包含下部贝氏体的1-10％，残留奥氏体的3％以下。通过埋弧焊接的缝焊在80kJ / cm以下的热输入下进行; 缝焊金属具有特定的组成成分。

6. 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％）。

7. 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

8. 发明专利

JP2013049895A High-strength welded steel pipe having high uniform elongation characteristic and excellent in weld zone low-temperature 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，焊接区低温韧性及其制造方法
公开(公告)号：JP2013049895A
公开(公告)日：2013-03-14
申请号：JP2011188576
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 , B21C37/08 , B23K35/30 , C21D7/12 , C21D8/10 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide: a high-strength welded steel pipe for an API X65 to X70 grade high strength line pipe, achieving both excellent deformability and weld zone toughness; 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 ferrite 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 ferrite grain boundary. The section of the weld metal has a micro structure in which acicular ferrite has an area ratio of 80% or more and island martensite has an area ratio of 5% or less. In the method for manufacturing the welded steel pipe, a steel slab having the specified base material component composition is hot rolled at a rolling finishing temperate Aror higher after re-heated up to Acor higher, and then a steel sheet obtained by performing air cooling is formed in a tubular shape by cold forming. Subsequently, the steel sheet is subjected to rapid heating up to Acor higher and Acor lower, followed by cooling down to room temperature by air cooling or water cooling, then an end of the steel sheet is welded, and finally, pipe expansion is performed.
摘要翻译：要解决的问题：提供：一种用于API X65至X70级高强度管线管的高强度焊接钢管，实现了优异的变形能力和焊接区韧性; 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，其中第一相为铁素体，第二相为岛状马氏体，分散在第一相中，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％以上存在于铁素体晶界。焊接金属的截面具有针状铁素体的面积率为80％以上，岛状马氏体的面积率为5％以下的微观结构。在焊接钢管的制造方法中，将具有规定的基材成分组成的钢板在重新加热至...之后，在轧制精轧温度Ar 3 以上进行热轧 Ac 3 以上，然后通过冷成型形成管状的钢板。随后，将钢板快速加热至Ac 1 或更高，Ac 3 或更低，然后冷却通过空气冷却或水冷却至室温，然后焊接钢板的端部，最后进行管道膨胀。版权所有（C）2013，JPO＆INPIT

9. 发明专利

JP2012241274A High strength linepipe superior in collapse resistance and sour resistance, and method for producing the same 有权
标题翻译：高强度耐高温和耐电弧性的高强度耐火材料及其制造方法
公开(公告)号：JP2012241274A
公开(公告)日：2012-12-10
申请号：JP2011115450
申请日：2011-05-24
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： TANIZAWA AKIHIKO , SHIMAMURA JUNJI , OKATSU MITSUHIRO , NISHIMURA KIMIHIRO , HORIE MASAYUKI
IPC分类号： C22C38/00 , B21B1/38 , B21B3/00 , B21C37/08 , B23K9/025 , C21D8/10 , C22C38/48 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a high strength linepipe which is inexpensively produced with high productivity without degrading collapse resistance and sour resistance, and to provide a method for producing the high strength linepipe.SOLUTION: The high strength linepipe having excellent collapse resistance and sour resistance is a welded steel pipe, obtained by forming a base material composed of a thick steel sheet into a tubular shape and joining the butted parts by welding the butted parts in two or more layers, and contains, by mass, 0.02-0.08% of C, 0.01-0.50% of Si, 0.5-1.5% of Mn, a certain content of each of P, S, Al, Nb, Ca and O, and further contains a certain amount of at least one selected from Cu, Ni, Cr and Mo, wherein Ceq is 0.30 or more, PHIC is 1.00 or less, ACR is 1.0-6.0, and the remainder comprises Fe and inevitable impurities. In the high strength linepipe, the volume fraction of island martensite (M-A) is 1% or less in the whole area of pipe thickness, and the metal structure and hardness of the surface layer part of the base material and the center part of pipe thickness of the base material are specified. The method for producing the linepipe is also provided.
摘要翻译：要解决的问题：提供一种高效率生产而不降低耐塌陷性和耐酸性的低强度线管，并且提供一种生产高强度管线管的方法。解决方案：具有优异的耐塌陷性和耐酸性的高强度管线管是焊接钢管，其通过将由厚钢板构成的基材形成管状并通过将对接部分焊接在两个接合部中而接合或更多层，并且以质量计含有C 0.02〜0.50％，Mn：0.5〜1.5％，P，S，Al，Nb，Ca，O各自的含量，以及还含有一定量的选自Cu，Ni，Cr和Mo中的至少一种，其中Ceq为0.30以上，PHIC为1.00以下，ACR为1.0〜6.0，余量包含Fe和不可避免的杂质。在高强度管线中，岛状马氏体（MA）的体积分数在管壁的整个面积上为1％以下，基体的表层部的金属结构和硬度以及管壁厚度的中心部分的基材。还提供了生产线管的方法。版权所有（C）2013，JPO＆INPIT

10. 发明专利

JP2012241272A High strength linepipe superior in collapse resistance and toughness of weld heat-affected zone, and method for producing the same 有权
标题翻译：焊接热影响区的抗拉强度和韧性的高强度衬砌层及其制造方法
公开(公告)号：JP2012241272A
公开(公告)日：2012-12-10
申请号：JP2011115448
申请日：2011-05-24
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： TANIZAWA AKIHIKO , SUEYOSHI HITOSHI , OKATSU MITSUHIRO , NISHIMURA KIMIHIRO , HORIE MASAYUKI
IPC分类号： C22C38/00 , B21C37/08 , C21D8/02 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength linepipe which is inexpensively produced with high productivity without degrading collapse resistance and toughness of a weld heat-affected zone, and to provide a method for producing the high strength linepipe.SOLUTION: The high strength linepipe superior in collapse resistance and toughness of a weld heat-affected zone is a welded steel pipe which is obtained by forming a base material composed of a thick steel sheet into a tubular shape, then joining the butted parts by welding the butted parts in two or more layers, and further expanding the resulting pipe. The high strength linepipe contains, by mass, 0.03-0.08% of C, 0.01-0.20% of Si, >1.5 and ≤2.5% of Mn, ≤0.015% of P, 0.001-0.05% of Al, 0.005-0.050% of Nb, 0.005-0.030% of Ti, and 0.0020-0.0080% of N, and further contains one or more selected from Cu, Ni, Cr, Mo and V, and satisfies a predetermined Ceq. In the high strength linepipe, the metal structure and hardness of the surface layer part of the base material and the center part of pipe thickness of the base material are specified.
摘要翻译：要解决的问题：提供一种高生产率廉价生产的高强度管线管，而不降低焊接热影响区的抗塌陷性和韧性，并提供一种生产高强度管线管的方法。解决方案：焊接热影响区的抗塌陷性和韧性优异的高强度管线管是通过将由厚钢板构成的基材形成管状而形成的焊接钢管，然后将对接通过将对接部分焊接在两层或更多层中，并进一步扩大所得到的管道。高强度管线管中，C：0.03〜0.08％，Si：0.01〜0.20％，Mn：1.5〜2.5％，P：0.015％，Al：0.001-0.05％，Al：0.005〜0.050％ Nb，0.005〜0.030％的Ti和0.0020〜0.0080％的N，并且还含有选自Cu，Ni，Cr，Mo和V中的一种或多种，并且满足预定的Ceq。在高强度线管中，规定了基材的表层部分的金属结构和硬度以及基材的管厚度的中心部分。版权所有（C）2013，JPO＆INPIT

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