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1.发明公开LOW YIELD RATIO HIGH-STRENGTH STEEL PLATE HAVING SUPERIOR STRAIN AGING RESISTANCE, PRODUCTION METHOD THEREFOR, AND HIGH-STRENGTH WELDED STEEL PIPE USING SAME 审中-公开具有低屈服点并以优异的抗应变时效性高强度钢板和工艺生产高强度焊接钢管THAT
公开(公告)号：EP2832889A4
公开(公告)日：2015-08-19
申请号：EP13767351
申请日：2013-03-29
申请人： JFE STEEL CORP
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： A steel plate having a low yield ratio and high strength excellent in terms of strain ageing resistance of an API 5L X70 grade or less, a method for manufacturing the steel plate and a high strength welded steel pipe made of the steel plate are provided. A high strength steel plate having a low yield ratio, the steel plate having a chemical composition containing, by mass%, C: 0.03% or more and 0.08% or less, Si: 0.01% or more and 1.0% or less, Mn: 1.2% or more and 3.0% or less, P: 0.015% or less, S: 0.005% or less, Al: 0.08% or less, Nb: 0.005% or more and 0.07% or less, Ti: 0.005% or more and 0.025% or less, N: 0.010% or less, O: 0.005% or less and the balance being Fe and inevitable impurities, a metallographic structure including a bainite phase and island martensite, and further including a polygonal ferrite in surface portions within 5 mm from the upper and lower surfaces, wherein the area fraction of the island martensite is 3% or more and 15% or less, wherein the equivalent circle diameter of the island martensite is 3.0 µm or less, wherein the area fraction of the polygonal ferrite in the surface portions is 10% or more and less than 80%, and wherein the remainder of the metallographic structure consists of a bainite phase, a hardness variation in the thickness direction of ”HV30 or less in terms of Vickers hardness, a hardness variation in the width direction of ”HV30 or less in terms of Vickers hardness, a maximum hardness in the surface portions of the steel plate of HV230 or less in terms of Vickers hardness and a yield ratio of 85% or less and an elongation of 22% or more in a full-thickness tensile test using a test piece having a shape in accordance with GOST standards.
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公开(公告)号：EP2434027A4
公开(公告)日：2014-01-22
申请号：EP09844949
申请日：2009-09-29
申请人： JFE STEEL CORP
CPC分类号： C22C38/02 , B23K35/3073 , C22C38/001 , C22C38/002 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/18
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公开(公告)号：EP2801638A4
公开(公告)日：2015-11-25
申请号：EP12870014
申请日：2012-03-01
申请人： JFE STEEL CORP
IPC分类号： C22C38/14 , B23K35/30 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/28 , C22C38/58
CPC分类号： C22C38/14 , B23K35/3053 , B23K35/3073 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/28
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4.发明公开BASE METAL FOR HIGH-TOUGHNESS CLAD STEEL PLATE GIVING WELD WITH EXCELLENT TOUGHNESS, AND PROCESS FOR PRODUCING SAID CLAD STEEL PLATE 审中-公开贱金属用于生产该电镀钢板焊接卓越高抗韧钢复合板和方法
公开(公告)号：EP2811045A4
公开(公告)日：2015-04-29
申请号：EP13743777
申请日：2013-01-28
申请人： JFE STEEL CORP
发明人： TACHIBANA SHUNICHI , YAZAWA YOSHIHIRO , KISHI KEIICHIRO , KURONUMA YOTA , HOSHINO TOSHIYUKI , NISHIMURA KIMIHIRO , SUEYOSHI HITOSHI
CPC分类号： C22C38/00 , B23K20/02 , B32B15/01 , B32B15/015 , C21D1/18 , C21D1/25 , C21D8/0205 , C21D9/08 , C21D2251/02 , C21D2251/04 , C22C19/03 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , Y10T428/12972
摘要： The present invention provides a base metal for a high-toughness clad plate having excellent toughness at a welded joint by composite addition of alloy elements. A base metal for high-toughness clad plate having excellent toughness at a welded joint contains, in terms of mass%, C: 0.030 to 0.10%, Si: 0.10 to 0.30%, Mn: 1.00 to 1.60%, P: 0.015% or less, S: 0.003% or less, V: less than 0.010%, and at least one selected from Mo: 0.05 to 0.50%, Nb: 0.010 to 0.060%, Ti: 0.005 to 0.020%, Al: 0.040% or less, Ca: 0.0010 to 0.0040%, and N: 0.0030 to 0.0060%, the balance being Fe and unavoidable impurities, in which a percent ductile fracture is 85% or more in a -20°C DWTT test and vE-20°C is 100 J or more at a HAZ 3 mm position.
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5.发明公开PEARLITE STEEL RAIL OF HIGH INTERNAL HARDNESS TYPE EXCELLENT IN WEAR RESISTANCE AND FATIGUE FAILURE RESISTANCE AND PROCESS FOR PRODUCTION OF THE SAME 有权PERLITSTAHLSCHIENE高密度，突出的耐磨性和耐疲劳性及其制造方法INNER
公开(公告)号：EP2135966A4
公开(公告)日：2012-01-04
申请号：EP08739394
申请日：2008-03-25
申请人： JFE STEEL CORP
发明人： HONJO MINORU , KIMURA TATSUMI , SUZUKI SHINICHI , NISHIMURA KIMIHIRO , MITAO SHINJI , SHIKANAI NOBUO
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6.发明公开LOW YIELD RATIO HIGH-STRENGTH STEEL PLATE HAVING SUPERIOR STRAIN AGING RESISTANCE, PRODUCTION METHOD THEREFOR, AND HIGH-STRENGTH WELDED STEEL PIPE USING SAME 审中-公开具有低屈服点并以优异的抗应变时效性高强度钢板和工艺生产高强度焊接钢管THAT
公开(公告)号：EP2832890A4
公开(公告)日：2015-08-19
申请号：EP13768567
申请日：2013-03-29
申请人： JFE STEEL CORP
CPC分类号： C22C38/58 , B23K9/025 , B23K9/18 , B23K9/23 , B23K31/027 , B23K2201/06 , B23K2201/10 , B23K2203/04 , C21D8/02 , C21D8/0263 , C21D8/105 , C21D9/08 , C21D9/46 , C21D9/50 , C21D2211/002 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/40 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
摘要： A steel plate having a low yield ratio and high strength of an API 5L X70 grade or less, a method for manufacturing the steel plate, and a high strength welded steel pipe made of the steel plate are provided. A high strength steel plate has a low yield ratio, the steel plate having a chemical composition containing, by mass%, C: 0.03% or more and 0.08% or less, Si: 0.01% or more and 1.0% or less, Mn: 1.2% or more and 3.0% or less, P: 0.015% or less, S: 0.005% or less, Al: 0.08% or less, Nb: 0.005% or more and 0.07% or less, Ti: 0.005% or more and 0.025% or less, N: 0.010% or less, O: 0.005% or less and the balance being Fe and inevitable impurities, a metallographic structure being a dual-phase structure consisting of a bainite phase and island martensite, wherein the area fraction of the island martensite is 3% or more and 15% or less, wherein the equivalent circle diameter of the island martensite is 3.0 µm or less, and wherein the remainder of the metallographic structure is a bainite phase, a hardness variation in the thickness direction of ”HV30 or less in terms of Vickers hardness, a hardness variation in the width direction of ”HV30 or less in terms of Vickers hardness, a maximum hardness in the surface portions of the steel plate of HV230 or less in terms of Vickers hardness and a yield ratio of 85% or less and an elongation of 22% or more in a full-thickness tensile test using a test piece having a shape in accordance with GOST standards.
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7.发明公开
公开(公告)号：EP2505682A4
公开(公告)日：2013-05-08
申请号：EP10833422
申请日：2010-11-25
申请人： JFE STEEL CORP
发明人： NISHIMURA KIMIHIRO , ISHIKAWA NOBUYUKI , TANIZAWA AKIHIKO , SUEYOSHI HITOSHI , HORIE MASAYUKI , KIYOTO YASUMITSU
IPC分类号： C22C38/00 , B21B3/00 , B21C37/08 , B21C37/30 , B23K9/025 , B23K9/028 , B23K9/18 , B23K9/23 , C21D8/02 , C21D8/10 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/58
CPC分类号： B23K9/0282 , B23K9/18 , C21D8/10 , C21D8/105 , C21D2211/002 , C22C38/06 , C22C38/12 , C22C38/14
摘要： Provided is a steel pipe for a linepipe with high compressive strength and a heavy wall thickness which can suppress lowering of yield stress caused by a Bauschinger effect by optimizing the metal microstructure of a steel plate without requiring particular forming conditions in forming the steel pipe and without requiring heat treatment after pipe making. To be more specific, provided are a steel pipe for a linepipe with high compressive strength and excellent sour resistance performance having the composition which contains by mass% 0.03 to 0.10% C, 0.30% or less Si, 1.00 to 2.00% Mn, 0.015% or less P, 0.003% or less S, 0.080% or less Al, 0.005 to 0.035% Nb, 0.005 to 0.020% Ti, and Fe and unavoidable impurities as a balance, wherein C(%) - 0.065Nb(%) is 0.025 or more, a Ceq value is 0.3 or more, and the steel pipe has metal microstructure where a fraction of bainite is 60% or more, a fraction of rolled ferrite is 5% or less, a fraction of M-A constituent (MA) is 3% or less, an average grain size of MA is 2 µm or less, and an aspect ratio of MA is 5 or less, and a method of manufacturing the steel pipe.
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8.发明公开PEARLITE STEEL RAIL OF HIGH INTERNAL HARDNESS TYPE EXCELLENT IN WEAR RESISTANCE, FATIGUE FAILURE RESISTANCE AND DELAYED FRACTURE RESISTANCE AND PROCESS FOR PRODUCTION OF THE SAME 有权具有优良的耐磨性，抗疲劳失效性能和抗用于生产延迟断裂和过程PERLITEISENSCHIENE类型的内部高密度
公开(公告)号：EP2196552A4
公开(公告)日：2015-12-23
申请号：EP08739390
申请日：2008-03-25
申请人： JFE STEEL CORP
IPC分类号： C22C38/00 , B21B1/085 , B21B3/00 , C21D1/02 , C21D6/00 , C21D8/00 , C21D9/04 , C22C38/02 , C22C38/04 , C22C38/24 , C22C38/48
CPC分类号： C22C38/02 , B21B1/085 , C21D1/02 , C21D6/00 , C21D6/002 , C21D6/005 , C21D8/005 , C21D9/04 , C21D2211/009 , C21D2221/00 , C21D2221/02 , C22C38/001 , C22C38/04 , C22C38/24
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9.发明公开WELDED STEEL PIPE WITH EXCELLENT WELDING HEAT-AFFECTED ZONE TOUGHNESS, AND PROCESS FOR PRODUCING SAME 审中-公开具有突出的焊接热焊接钢管影响区电阻及其制造方法
公开(公告)号：EP2764946A4
公开(公告)日：2015-06-10
申请号：EP12838033
申请日：2012-10-03
申请人： JFE STEEL CORP
IPC分类号： B23K9/025 , B21C37/08 , B23K9/18 , B23K9/23 , B23K33/00 , B23K101/06 , B23K103/04 , C22C38/00 , C22C38/58
CPC分类号： F16L9/02 , B23K9/0253 , B23K9/0282 , B23K9/18 , B23K33/006 , B23K2201/10 , B23K2203/04 , C21D8/10 , C21D8/105 , C21D9/50 , C21D2211/001 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , Y10T428/12292
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公开(公告)号：EP2272994A4
公开(公告)日：2014-01-08
申请号：EP09726619
申请日：2009-03-27
申请人： JFE STEEL CORP
CPC分类号： C22C38/14 , C21D8/0226 , C21D8/0263 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12
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