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1. 发明公开

EP3321387A4 HIGH-STRENGTH THIN STEEL SHEET AND METHOD FOR MANUFACTURING SAME 有权
公开(公告)号：EP3321387A4
公开(公告)日：2018-05-16
申请号：EP16821038
申请日：2016-07-05
申请人： JFE STEEL CORP
发明人： KIZU TARO , TOYODA SHUNSUKE , KIDO AKIMASA , TADANI TETSUSHI
IPC分类号： C22C38/00 , B21B1/22 , B21B3/00 , C21D8/02 , C21D9/46 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/24 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , C22C38/60
CPC分类号： B21B1/22 , B21B3/00 , C21D8/0226 , C21D8/0263 , C21D9/46 , C21D2211/004 , C22C38/00 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/24 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , C22C38/60
摘要： This disclosure provides a predetermined composition, where a conversion value C* of total carbon contents in Ti, Nb and V precipitates whose grain sizes are less than 20 nm is 0.010 mass% to 0.100 mass%, Fe content in Fe precipitates is 0.03 mass% to 0.50 mass%, and an average grain size of ferrite grains whose grain sizes are top 5 % large in ferrite grain size distribution of rolling direction cross section is (4000/TS) 2 µm or less, the TS indicating tensile strength in unit of MPa.

2. 发明公开

EP3279353A4 HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME 有权
公开(公告)号：EP3279353A4
公开(公告)日：2018-02-07
申请号：EP16771783
申请日：2016-03-30
申请人： JFE STEEL CORP
发明人： TANAKA TAKAAKI , KIZU TARO , TOYODA SHUNSUKE
IPC分类号： C22C38/00 , C21D6/00 , C21D6/02 , C21D8/02 , C21D9/46 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/28 , C22C38/38 , C22C38/60
CPC分类号： C21D9/46 , C21D6/005 , C21D6/008 , C21D6/02 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D8/0273 , C21D2211/002 , C21D2211/004 , C21D2211/008 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/28 , C22C38/38 , C22C38/60
摘要： A hot rolled steel sheet comprises: a predetermined chemical composition; a microstructure in which a total area ratio of a tempered bainite phase and a tempered martensite phase is 70% or more, a total area ratio of a coarse pearlite phase, a martensite phase, and a retained austenite phase is 10% or less, the tempered bainite phase and the tempered martensite phase have laths with an average width of 1.0 µm or less as a substructure, a proportion of Fe-based carbides with an aspect ratio of 5 or less in Fe-based carbides precipitated inside and at boundaries of the laths is 80% or more, and MC-type carbides with an average particle size of 20 nm or less are dispersed and precipitated inside and at the boundaries of the laths; and an average dislocation density of 1.0 × 10 14 m -2 or more and 5.0 × 10 15 m -2 or less.

3. 发明公开

EP3020840A4 THICK-WALLED ELECTRIC RESISTANCE WELDED STEEL PIPE FOR LINE PIPE, AND METHOD FOR MANUFACTURING SAID STEEL PIPE 有权
标题翻译：厚壁WIDERSTANDSGESCHWEISSTES钢管管线管法生产这种钢管
公开(公告)号：EP3020840A4
公开(公告)日：2016-08-03
申请号：EP14822859
申请日：2014-07-08
申请人： JFE STEEL CORP
发明人： GOTO SOTA , TOYODA SHUNSUKE , OKABE TAKATOSHI
IPC分类号： C22C38/00 , B21C37/08 , C21D8/02 , C21D9/08 , C21D9/50 , C22C38/12 , C22C38/58
CPC分类号： C21D9/085 , B23K11/0873 , C21D1/42 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/105 , C21D9/08 , C21D9/50 , C21D9/505 , C21D2211/002 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/58 , Y02P10/253
摘要： Provided is a heavy wall electric resistance welded steel pipe for a line pipe having a high strength of X52 grade or more specified by the API and a high toughness. By using, as a raw material, a thick hot-rolled steel sheet having a chemical composition containing, by mass%, C: 0.02% or more and 0.10% or less, Si: 0.05% or more and 0.30% or less, Mn: 0.80% or more and 2.00% or less, and Nb: 0.010% or more and 0.100% or less and satisfying the condition that a carbon equivalent Ceq is 0.25% or more and 0.50% or less, a microstructure including a bainitic ferrite phase and/or a bainite phase, a high strength of 52 ksi or more in terms of yield strength and a high toughness of -45°C or lower in terms of fracture transition temperature vTrs, an electric resistance weld zone having a microstructure including a bainitic ferrite phase and/or a bainite phase and satisfying the condition that the ratio of the average crystal grain size of the coarsest-grain portion to the average crystal grain size of the finest-grain portion is 2.0 or less in every portion in the wall thickness direction is obtained by performing a heat treatment on an electric resistance weld zone including performing induction heating such that an electric resistance weld zone has a minimum temperature of 830°C or higher and a maximum temperature of 1150°C or lower and performing a cooling treatment to a cooling stop temperature of 550°C or lower at an average cooling rate of 10°C/s or more and 70°C/s or less in every portion in the wall thickness direction. With this method, the heavy wall electric resistance welded steel pipe has high toughness, and 0.80 mm or more in terms of critical opening displacement ´ at a testing temperature of -25°C in a CTOD test even in the electric resistance weld zone.
摘要翻译：提供了一种用于具有X52级或由API和高韧性多个指定的高强度的管线管厚壁电阻焊钢管。通过使用作为原料的，具有化学组成包含一个厚的热轧钢板中，以质量％计，C：0.02％以上且0.10％以下，Si：0.05％以上且0.30％至或以下，Mn ：0.80％以上且2：00％或以下，及Nb：0.010％以上且0.100％以下，并满足条件做了碳当量Ceq为0.25％以上且0.50％以下，微结构包括贝氏体铁素体相和/或贝氏体相，在屈服强度和-45℃或更低的在上具有微结构包含贝氏体电阻焊接区断裂转变临界温度vTrs的方面具有高韧性方面具有高强度的52个95ksi以上铁素体相和/或贝氏体相和满足条件并最粗晶粒部分的平均晶粒尺寸为最好的晶粒部分的平均晶粒尺寸的比值在每个部分2.0或更小的壁厚方向是通过在电resistan上进行热处理获得切·韦尔德区包括执行感应加热搜索做了电阻焊接区具有830℃或更高的最低温度和1150℃或更低的最高温度和550℃以下的冷却停止温度进行冷却处理在以10℃/ s以上且在壁厚方向各部分的70℃/ s以下的平均冷却速度。用这种方法，所述重壁电阻焊钢管具有高韧性，并且在在CTOD试验，即使在电阻焊接区的-25℃的试验温度极限开口位移量”的术语0.80毫米以上。

4. 发明公开

EP1693476A4 STEEL PRODUCT FOR STRUCTURAL MEMBER OF AUTOMOBILE AND METHOD FOR PRODUCTION THEREOF 有权
标题翻译：钢铁产品用于生产汽车部件及其过程
公开(公告)号：EP1693476A4
公开(公告)日：2009-07-22
申请号：EP04807135
申请日：2004-12-09
申请人： JFE STEEL CORP , TOYOTA MOTOR CO LTD
发明人： TOYODA SHUNSUKE , SAKATA KEI , SATO AKIO , KANEKO KOUICHI , KAWAGUCHI HIROSHI
IPC分类号： C21D9/46 , C22C38/00 , C21D8/02 , C21D8/10 , C22C38/58
CPC分类号： C22C38/02 , C21D8/0226 , C21D8/10 , C22C38/001 , C22C38/002 , C22C38/04 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38
摘要： A method for producing a steel product which comprises providing a steel slab having a chemical composition satisfying C: 0.18 to 0.29 %, Si: 0.06 to 0.45 %, Mn: 0.91 to 1.85 %, P: 0.019 % or less, S: 0.0029% or less, sol.Al: 0.015 to 0.075%, N: 0.0049 % or less, O: 0.0049 % or less, B: 0.0001 to 0.0029 %, Nb: 0.001 to 0.019 %, Ti: 0.001 to 0.029 %, Cr: 0.001 to 0.195 %, Mo: 0.001 to 0.195 %, and 0.4 or more and less than 0.58 of Ceq, and satisfying that the sum (χ) of hardenability multiples according to Grossmann being aware of B is 1.2 or more and less than 1.7, heating the steel slab to 1160 to 1320˚C, subjecting the resultant slab to a hot finish rolling having an ending temperature for the finish rolling of 750 to 980˚C, annealing the rolled product for a period of 2s or more before winding, and then winding the product up at a temperature of 560 to 740˚C, to thereby produce a hot-rolled steel belt which has a structure having an average grain diameter (df) corresponding to a ferrite circle of 1.1 μm or more and less than 12 μm and a ferrite volume percentage (Vf) of 30 to 98 %. A steel pipe is produced by a method comprising using the above hot-rolled steel belt as a material and subjecting it to an electric welding wherein a reduction ratio for width is 8 % or less. A steel product produced by the above method is excellent in formability, fatigue strength after hardening, toughness at a low temperature, characteristics of resistance to delayed break and corrosion fatigue strength.

5. 发明公开

EP2927338A4 HOT-ROLLED STEEL PLATE FOR HIGH-STRENGTH LINE PIPE AND HAVING TENSILE STRENGTH OF AT LEAST 540 MPa 有权
标题翻译：热轧板高强度管材具有至少540 MPA的抗拉强度
公开(公告)号：EP2927338A4
公开(公告)日：2015-12-16
申请号：EP14742727
申请日：2014-01-23
申请人： JFE STEEL CORP
发明人： GOTO SOTA , TOYODA SHUNSUKE , OKABE TAKATOSHI , OKAZAKI YUKIHIKO
IPC分类号： C21D9/50 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
CPC分类号： C21D9/46 , C21D8/02 , C21D8/0205 , C21D8/0226 , C21D9/50 , C21D2211/002 , C22C38/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/20 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50

6. 发明公开

EP2050833A4 HIGH-TENSION WELDED STEEL PIPE FOR AUTOMOTIVE STRUCTURAL MEMBER AND PROCESS FOR PRODUCING THE SAME 有权
标题翻译：高负荷的自动COMPONENT及工艺焊接钢管用于生产
公开(公告)号：EP2050833A4
公开(公告)日：2015-04-22
申请号：EP07767459
申请日：2007-06-19
申请人： JFE STEEL CORP
发明人： TOYODA SHUNSUKE , ARATANI MASATOSHI , KAWABATA YOSHIKAZU , HASHIMOTO YUJI , SUZUKI KOJI , SAKATA KEI , GUNJI MAKIO , SATO AKIO , SAWAKI TETSURO
IPC分类号： C22C38/00 , B21C37/08 , C21D8/02 , C21D8/10 , C22C38/14 , C22C38/58
CPC分类号： B21C37/08 , C21D1/26 , C21D8/02 , C21D8/0226 , C21D8/0263 , C21D9/08 , C21D2211/005 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/14

7. 发明公开

EP2415539A4 METHOD FOR MANUFACTURING TORSION BEAM AND TORSION BEAM 有权
标题翻译：一种用于生产复合车把复合棒材
公开(公告)号：EP2415539A4
公开(公告)日：2012-08-22
申请号：EP10758933
申请日：2010-03-31
申请人： JFE STEEL CORP
发明人： HASHIMOTO YUJI , TOYODA SHUNSUKE , NAKAGAWA KINYA , SUZUKI KOJI , KAWABATA YOSHIKAZU , SONOBE OSAMU , SATO AKIO
IPC分类号： B21D53/88 , B21D11/02 , B21D17/02 , B60G9/04
CPC分类号： B21D53/88 , B21D9/15 , B21D11/02 , B21D17/02 , B21D22/025 , B60G21/051 , B60G2206/30 , B60G2206/80 , Y10T29/49622

8. 发明公开

EP3266897A4 HIGH STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR 有权
公开(公告)号：EP3266897A4
公开(公告)日：2018-03-28
申请号：EP16761275
申请日：2016-03-01
申请人： JFE STEEL CORP
发明人： KIZU TARO , TOYODA SHUNSUKE , KIDO AKIMASA , TADANI TETSUSHI
IPC分类号： C22C38/00 , C21D8/02 , C21D9/46 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , C22C38/60
CPC分类号： C21D9/46 , C21D8/0205 , C21D8/0226 , C21D2211/005 , C22C38/00 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , C22C38/60 , Y02P10/212
摘要： A high strength steel sheet having high strength such as a tensile strength of 780 MPa or more and having excellent blanking workability and stretch flangeability and a manufacturing method therefor are provided. A high strength steel sheet comprises: a chemical composition containing, in mass%, C: 0.05% to 0.30%, Si: 0.6% to 2.0%, Mn: 1.3% to 3.0%, P: 0.10% or less, S: 0.030% or less, Al: 2.0% or less, N: 0.010% or less, and one or more of Ti, Nb, and V: 0.01% to 1.0% each, with a balance being Fe and incidental impurities; a ferrite microstructure of 50% or more in area ratio; an amount of precipitated Fe of 0.04 mass% or more; and a precipitate with a particle size of less than 20 nm, wherein C* defined by the following Expression (1) and C* p defined by the following Expression (2) meet conditions of the following Expressions (3) to (5): C * = Ti / 48 + Nb / 93 + V / 51 + Mo / 96 + Ta / 181 + W / 184 × 12 C * p = Ti p / 48 + Nb p / 93 + V p / 51 + Mo p / 96 + Ta p / 181 + W p / 184 × 12 C * ‰¥ 0.035 ˆ’ 0.015 ‰¤ C ˆ’ C * ‰¤ 0.03 C * p / C * ‰¥ 0.3

9. 发明公开

EP2927339A4 HOT-ROLLED STEEL PLATE FOR HIGH-STRENGTH LINE PIPE 有权
标题翻译： WARMGEWALZTES STAHLBLECHFÜRHOCHFESTE LEITUNGSROHRE
公开(公告)号：EP2927339A4
公开(公告)日：2015-12-16
申请号：EP14743980
申请日：2014-01-23
申请人： JFE STEEL CORP
发明人： GOTO SOTA , TOYODA SHUNSUKE , OKABE TAKATOSHI , OKAZAKI YUKIHIKO
IPC分类号： C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
CPC分类号： C21D9/46 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D2211/004 , C21D2211/005 , C22C38/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50

10. 发明公开

EP2837708A4 HIGH-STRENGTH THICK-WALLED ELECTRIC-RESISTANCE-WELDED STEEL PIPE HAVING EXCELLENT LOW-TEMPERATURE TOUGHNESS, AND METHOD FOR MANUFACTURING SAME 有权
标题翻译：高钢的强度和管性优异厚壁WIDERSTANDSGESCHWEISSTES其制造冷韧性和方法
公开(公告)号：EP2837708A4
公开(公告)日：2015-08-12
申请号：EP13775345
申请日：2013-04-11
申请人： JFE STEEL CORP
发明人： TOYODA SHUNSUKE , GOTO SOTA , OKABE TAKATOSHI , INOUE TOMOHIRO , EGI MOTOHARU , YONEMOTO ATSUSHI
IPC分类号： C22C38/04 , B21B3/00 , B21C37/08 , C21D1/00 , C21D8/02 , C21D8/10 , C21D9/08 , C21D9/50 , C22C38/14 , C22C38/58
CPC分类号： F16L9/02 , B21B3/00 , B21B27/06 , B21B27/08 , B21C37/08 , B23K11/0073 , B23K11/0873 , B32B1/08 , C21D1/00 , C21D8/02 , C21D8/0226 , C21D8/0263 , C21D8/105 , C21D9/08 , C21D9/085 , C21D9/50 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/58 , F16L9/17 , Y10T428/12958 , Y10T428/12965 , Y10T428/12972 , Y10T428/12979 , Y10T428/13
摘要： There is provided a high-strength thick-walled electric resistance welded steel pipe having excellent low-temperature toughness and excellent HIC resistance and having a yield strength of 400 MPa or more. Steel is heated to and held at a temperature in the range of 1200°C to 1280°C. The steel has a chemical composition consisting of C: 0.025% to 0.084%, Si: 0.10% to 0.30%, Mn: 0.70% to 1.80%, controlled amounts of P, S, Al, N, and O, Nb: 0.001% to 0.065%, V: 0.001% to 0.065%, Ti: 0.001% to 0.033%, and Ca: 0.0001% to 0.0035% on a mass percent basis and the remainder being Fe and incidental impurities, and satisfies Pcm of 0.20 or less. The steel is hot-rolled at a rolling reduction of 20% or more in an unrecrystallization temperature range. After the completion of the hot-rolling, the steel is cooled to a finish cooling temperature of 630°C or less at a cooling rate in the range of 7°C/s to 49°C/s and is coiled at 400°C or more and less than 600°C to form a hot-rolled steel strip. The hot-rolled steel strip is subjected to roll-forming and electric resistance welding to produce an electric resistance welded steel pipe. The welded portion of the electric resistance welded steel pipe is then subjected to a heat treatment in which the welded portion is heated to a temperature in the range of 800°C to 1150°C over the total wall thickness and is then cooled to 630°C or less at an average cooling rate in the range of 7°C/s to 49°C/s. The base steel portion and the electric resistance welded portion of the resulting high-strength thick-walled electric resistance welded steel pipe have excellent low-temperature toughness and excellent HIC resistance.

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