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

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.

公开(公告)号：EP3239317A4

公开(公告)日：2018-06-06

申请号：EP15872199

申请日：2015-12-15

申请人： JFE STEEL CORP

发明人： GOTO SOTA ,  OKABE TAKATOSHI ,  OKAZAKI YUKIHIKO

IPC分类号： C22C38/00 ,  B21B19/10 ,  B21C37/08 ,  C21D6/00 ,  C21D8/02 ,  C21D8/10 ,  C21D9/08 ,  C21D9/50 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/58

CPC分类号： C21D9/08 ,  B21B19/10 ,  B21C37/08 ,  C21D6/001 ,  C21D6/005 ,  C21D6/008 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/105 ,  C21D9/50 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/58

摘要： A high-strength high-toughness electric-resistance-welded steel pipe having high resistance to post-weld heat treatment is provided. A hot-rolled steel plate serving as a material is subjected to roll forming so as to have a generally circular cross section and is subjected to electric resistance welding to form an electric-resistance-welded steel pipe. The electric-resistance-welded portion of the electric-resistance-welded steel pipe is then subjected to in-line heat treatment. The electric-resistance-welded steel pipe is then subjected to reducing rolling such that the circularity of an end portion of the steel pipe is 0.6% or less. The hot-rolled steel plate serving as a material has a composition containing C: 0.01% to 0.12%, Si: 0.05% to 0.50%, Mn: 1.0% to 2.2%, P: 0.03% or less, S: 0.005% or less, Al: 0.001% to 0.10%, N: 0.006% or less, Nb: 0.010% to 0.100%, and Ti: 0.001% to 0.050% and has a structure composed of 90% or more by volume of a bainitic ferrite phase and 10% or less (including 0%) by volume of a second phase, the bainitic ferrite phase having an average grain size of 10 µm or less, the structure containing fine Nb precipitates having a particle size of less than 20 nm dispersed in a base material portion, the ratio (%) of the fine Nb precipitates to the total amount of Nb being 75% or less on a Nb equivalent basis. The electric-resistance-welded steel pipe can have high strength and toughness and maintain strength through post-weld heat treatment including heating to a temperature of 600°C or more. The electric-resistance-welded steel pipe is less likely to be broken while placed as a deep-well conductor casing.

公开(公告)号：EP2871253A4

公开(公告)日：2015-11-18

申请号：EP13836371

申请日：2013-09-11

申请人： JFE STEEL CORP

发明人： KAMI CHIKARA ,  GOTO SOTA

IPC分类号： C22C38/00 ,  B21B3/02 ,  C21D8/02 ,  C22C38/58

CPC分类号： C22C38/001 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/1222 ,  C21D8/1261 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

摘要： Provides is a high strength hot rolled steel sheet with low yield ratio which is excellent in low-temperature toughness and can be preferably used as a raw material of a steel pipe. The steel sheet has a chemical composition containing C: 0.03% or more and 0.10% or less, Si: 0.01% or more and 0.50% or less, Mn: 1.4% or more and 2.2% or less, P: 0.025% or less, S: 0.005% or less, Al: 0.005% or more and 0.10% or less, Nb: 0.02% or more and 0.10% or less, Ti: 0.001% or more and 0.030% or less, Mo: 0.01% or more and 0.50% or less, Cr: 0.01% or more and 0.50% or less, and Ni: 0.01% or more and 0.50% or less, in which the condition that Moeq is 1.4% or more and 2.2% or less is preferably satisfied, and a microstructure in an inner layer including a bainitic ferrite phase as a main phase and, in terms of area fraction, 1.4% or more and 15% or less of a massive martensitic phase having an aspect ratio of less than 5.0 as a second phase, in which the lath thickness of the bainitic ferrite phase is 0.2 µm or more and 1.6 µm or less. It is preferable that the size of the massive martensitic phase be 5.0 µm or less at most and 0.5 µm or more and 3.0 µm or less on average.

公开(公告)号：EP3269489A4

公开(公告)日：2018-05-02

申请号：EP16761250

申请日：2016-02-18

申请人： JFE STEEL CORP

发明人： OKABE TAKATOSHI ,  GOTO SOTA ,  HASHIMOTO YUJI ,  KATO YASUSHI ,  MATSUMOTO ATSUSHI ,  IDE SHINSUKE ,  OTA HIROKI

IPC分类号： B23K13/00 ,  B21C37/08 ,  B23K11/06 ,  B23K11/087 ,  B23K11/36 ,  B23K13/02 ,  B23K13/04 ,  B23K13/06 ,  B23K101/06 ,  B23K101/10 ,  B23K103/04

CPC分类号： B21C37/08 ,  B23K11/062 ,  B23K11/0873 ,  B23K11/36 ,  B23K13/00 ,  B23K13/02 ,  B23K13/025 ,  B23K13/046 ,  B23K13/06 ,  B23K2201/06 ,  B23K2201/10 ,  B23K2203/04

摘要： Provided are an electric-resistance-welded stainless clad steel pipe which has excellent weld characteristics, even without performing an additional welding process that is required in existing techniques after electric resistance welding, and a method of manufacturing the same. An electric-resistance-welded stainless clad steel pipe is manufactured by forming a hot-rolled steel strip of clad steel including low-carbon low-alloy steel and stainless steel into a cylindrical shape, and electric-resistance-welding the edges of the hot-rolled steel strip, characterized in that the flattening characteristic of an electric resistance weld, as-welded, satisfies the following formula: h / D

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

公开(公告)号：EP3239316A4

公开(公告)日：2018-05-16

申请号：EP15872198

申请日：2015-12-15

申请人： JFE STEEL CORP

发明人： GOTO SOTA ,  OKABE TAKATOSHI ,  OKAZAKI YUKIHIKO

IPC分类号： C22C38/00 ,  B21B19/14 ,  B21C37/08 ,  C21D6/00 ,  C21D8/02 ,  C21D9/08 ,  C21D9/50 ,  C22C38/14 ,  C22C38/58

CPC分类号： C21D9/50 ,  B21B19/14 ,  B21B23/00 ,  B21C37/08 ,  B23K11/0873 ,  B23K2201/06 ,  B23K2203/04 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0263 ,  C21D9/08 ,  C21D9/46 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/58 ,  F16L9/17

摘要： A high-strength high-toughness electric-resistance-welded steel pipe having high resistance to post-weld heat treatment is provided. A hot-rolled steel plate serving as a material is subjected to roll forming so as to have a generally circular cross section and is subjected to electric resistance welding to form an electric-resistance-welded steel pipe. The electric-resistance-welded portion of the electric-resistance-welded steel pipe is then subjected to in-line heat treatment. The electric-resistance-welded steel pipe is then subjected to reducing rolling such that the circularity of an end portion of the steel pipe is 0.6% or less. The hot-rolled steel plate serving as a material has a composition containing C: 0.01% to 0.12%, Si: 0.05% to 0.50%, Mn: 1.0% to 2.2%, P: 0.03% or less, S: 0.005% or less, Al: 0.001% to 0.10%, N: 0.006% or less, Nb: 0.010% to 0.100%, and Ti: 0.001% to 0.050% and has a structure composed of 90% or more by volume of a bainitic ferrite phase as a main phase and 10% or less (including 0%) by volume of a second phase, the bainitic ferrite phase having an average grain size of 10 µm or less, the structure containing fine Nb precipitates having a particle size of less than 20 nm dispersed in a base material portion, the ratio (%) of the fine Nb precipitates to the total amount of Nb being more than 75% on a Nb equivalent basis. A thick-walled electric-resistance-welded steel pipe thus manufactured can have high strength and toughness and high resistance to post-weld heat treatment and is less likely to be broken while placed as a deep-well conductor casing.

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。

公开(公告)号：EP2949772A4

公开(公告)日：2016-06-01

申请号：EP14778532

申请日：2014-03-20

申请人： JFE STEEL CORP

发明人： SHIBATA TOMOAKI ,  GOTO SOTA

IPC分类号： C22C38/00 ,  B21B1/26 ,  B21B3/00 ,  C21D8/02 ,  C22C38/14 ,  C22C38/58

CPC分类号： C22C38/38 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28

公开(公告)号：EP3225709A4

公开(公告)日：2017-12-13

申请号：EP15862558

申请日：2015-11-17

申请人： JFE STEEL CORP

发明人： TOYODA SHUNSUKE ,  OKABE TAKATOSHI ,  GOTO SOTA ,  MATSUI YUTAKA ,  YABUMOTO SATORU

IPC分类号： C22C38/00 ,  B21C37/08 ,  B21C51/00 ,  C21D8/02 ,  C21D9/08 ,  C21D9/50 ,  C22C38/14 ,  C22C38/58

CPC分类号： C22C38/16 ,  B21B23/00 ,  B21C37/08 ,  B21C51/00 ,  B23K11/0873 ,  B23K2201/06 ,  B23K2203/04 ,  C21D8/02 ,  C21D9/08 ,  C21D9/50 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/58 ,  F16L9/17

摘要： A resistance welded steel pipe having excellent resistance to leakage under internal pressure and excellent electric resistance weld zone toughness is provided. A hot-rolled steel sheet having a composition containing, in mass %, C: 0.025 to 0.168%, Si: 0.10 to 0.30%, Mn: 0.60 to 1.90%, and one or at least two selected from Ca, Nb, V, and Ti such that Pcm is 0.20 or less is subjected to continuous cold roll forming to obtain a pipe-shaped body. In this case, tapered grooves are formed in the lateral end surface of the steel sheet such that the ratio of the tapered portions to the wall thickness of the steel sheet is 10 to 80%. Then the end surfaces of the pipe-shaped body are butted against each other and subjected to electric resistance welding to thereby obtain a pipe body. Ultrasonic waves are transmitted toward the electric resistance weld surface such that a beam width is within the range of 0.1 to 4.0 mm, and the reflected waves are used for ultrasonic flaw detection using an ultrasonic flaw detector that uses array probes to thereby inspect the soundness of the electric resistance weld zone. After or before the inspection, the electric resistance weld zone is subjected to seam annealing treatment in which the electric resistance weld zone is heated to 850 to 1,150°C and cooled at a cooling rate of 20 to 200°C/s. In the electric resistance