公开(公告)号：US20240033861A1

公开(公告)日：2024-02-01

申请号：US18265503

申请日：2021-10-13

Applicant: JFE Steel Corporation

Inventor： Kazufumi Watanabe ,  Atsushi Takada ,  Akiyoshi Ando ,  Takatoshi Okabe ,  Keiji Ueda

IPC: B23K35/30 ,  B23K35/02 ,  B23K9/18

CPC classification number: B23K35/3073 ,  B23K35/0261 ,  B23K9/18

Abstract: A submerged arc welding wire is provided that has a composition including, by mass %, C: 0.20 to 0.80%, Si: 0.15 to 0.90%, Mn: 15.0 to 30.0%, P: 0.030% or less, S: 0.030% or less, Cr: 6.0 to 15.0%, and N: 0.120% or less, the balance being Fe and incidental impurities. Where necessary, the wire may contain one or two selected from Ni and Mo, may further contain one, or two or more selected from V, Ti, and Nb, and may additionally contain one, or two or more selected from Cu, Al, Ca, and REM.

公开(公告)号：US20220373108A1

公开(公告)日：2022-11-24

申请号：US17771864

申请日：2020-10-02

Applicant: JFE Steel Corporation

Inventor： Akihide Matsumoto ,  Shinsuke Ide ,  Takatoshi Okabe

IPC: F16L9/17 ,  B21C37/08 ,  C22C38/04 ,  C22C38/06 ,  C22C38/02 ,  C21D8/10 ,  C21D8/12 ,  C21D9/08

Abstract: An electric resistance welded steel pipe includes a base metal zone and an electric resistance welded zone. The base metal zone has a predetermined chemical composition and a microstructure including, by volume, ferrite: more than 30%, and bainite: 10% or more. The total volume fraction of the ferrite and the bainite is 70% or more and 95% or less. The balance being one or two or more phases selected from pearlite, martensite, and austenite. Further, when regions surrounded by boundaries between adjacent crystals having a misorientation of 15° or more are defined as crystal grains, the average size of the crystal grains is less than 7.0 μm, and the volume fraction of crystal grains having a size of 40.0 μm or more is 30% or less. A compressive residual stress generated in the inner and outer surfaces of the steel pipe in the axial direction is 250 MPa or less.

公开(公告)号：US11484927B2

公开(公告)日：2022-11-01

申请号：US16331222

申请日：2017-08-31

Applicant: JFE STEEL CORPORATION

Inventor： Takatoshi Okabe ,  Atsushi Matsumoto ,  Shinsuke Ide ,  Akihide Matsumoto

IPC: B21C37/08 ,  B23K13/06 ,  C21D9/08 ,  C21D9/50 ,  C22C38/06 ,  C22C38/38 ,  B23K35/38 ,  B23K11/087 ,  B21B1/22 ,  B23K11/00 ,  C22C38/04 ,  F16L9/18 ,  C22C38/00 ,  C21D6/00 ,  B32B15/01 ,  C22C38/12 ,  C22C38/02 ,  C22C38/14 ,  B21C37/14 ,  B23K11/16 ,  B23K11/34 ,  F16L9/17 ,  C22C38/40 ,  B23K101/06 ,  B23K103/04 ,  B23K103/18 ,  B23K101/34 ,  B23K101/18

Abstract: Provided is a clad welded pipe or tube that has improved pipe or tube mechanical properties by reducing the width of a weld without its function as a clad pipe or tube being impaired. A clad welded pipe or tube comprises: a first layer made of base metal; and a second layer placed on one surface of the first layer, and made of first cladding metal that is a material different from the base metal, wherein a pipe or tube circumferential length L1 of weld metal at a pipe or tube inner surface and a pipe or tube circumferential length L2 of the weld metal at a pipe or tube outer surface in a weld are each 0.0010 mm or more and 1.0 mm or less, and the base metal is not exposed at a first cladding metal-side surface of the clad welded pipe or tube in the weld.

公开(公告)号：US11041223B2

公开(公告)日：2021-06-22

申请号：US15539421

申请日：2015-12-15

Applicant: JFE STEEL CORPORATION

Inventor： Sota Goto ,  Takatoshi Okabe ,  Yukihiko Okazaki

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

Abstract: A high-strength high-toughness electric-resistance-welded steel pipe having high resistance to post-weld heat treatment is provided. The steel pipe having a composition including 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%. The steel pipe having 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, and the structure containing fine Nb precipitates having a particle size of less than 20 nm dispersed in a base material portion. The steel pipe having high strength and toughness that is maintained through post-weld heat treatment, including heating to a temperature of 600° C. or more.

公开(公告)号：US20180030557A1

公开(公告)日：2018-02-01

申请号：US15554937

申请日：2016-02-18

Applicant: JFE STEEL CORPORATION

Inventor： Sota Goto ,  Shunsuke Toyoda ,  Takatoshi Okabe

IPC: C21D8/02

CPC classification number: C21D8/02 ,  B21C37/08 ,  B23K11/002 ,  B23K11/02 ,  B23K11/0873 ,  B23K11/16 ,  B23K13/025 ,  B23K31/027 ,  B23K2101/06 ,  B23K2101/18 ,  B23K2103/04 ,  C21D8/105 ,  C21D9/08 ,  C21D9/50 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/58 ,  F16L9/17 ,  Y02P10/212

Abstract: Provided is a high-strength electric resistance welded steel pipe having excellent bendability and which includes a composition containing, on a mass % basis, C: 0.04% to 0.15%, Si: 0.10% to 0.50%, Mn: 1.0% to 2.2%, P: 0.050% or less, S: 0.005% or less, Cr: 0.2% to 1.0%, Ti: 0.005% to 0.030%, and Al: 0.010% to 0.050%, the balance being Fe and unavoidable impurities, and a microstructure including polygonal ferrite with a volume fraction of 70% or more and retained austenite with a volume fraction of 3% to 20%, the balance being at least one selected from martensite, bainite, and pearlite, wherein the polygonal ferrite has an average grain size of 5 μm or more and an aspect ratio of 1.40 or less.

公开(公告)号：US20160153063A1

公开(公告)日：2016-06-02

申请号：US14903804

申请日：2014-07-08

Applicant: JFE STEEL CORPORATION

Inventor： Sota Goto ,  Shunsuke Toyoda ,  Takatoshi Okabe

IPC: C21D9/08 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D1/42 ,  C21D8/10 ,  C21D8/02 ,  C21D9/50 ,  C21D6/00 ,  B23K11/087 ,  C22C38/38

CPC classification number: 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

Abstract: 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, 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

Abstract translation: 通过使用以质量％计含有C：0.02％以上且0.10％以下，Si：0.05％以上且0.30％以下的化学成分的粗制热轧钢板作为原料，使用Mn ：0.80％以上且2.00％以下，Nb：0.010％以上且0.100％以下，并且满足碳当量为0.005％以上且0.50％以下的条件，包含贝氏体铁素体相 和/或贝氏体相，在屈服强度方面为52ksi以上的高强度，在断裂转变温度vTrs方面为-45℃以下的高韧性或更低的韧性，并且满足以下条件：平均值 获得最细粒部分的晶粒尺寸与最细粒部分的平均晶粒尺寸在壁厚方向的每一部分中为2.0以下

公开(公告)号：US11079045B2

公开(公告)日：2021-08-03

申请号：US16331235

申请日：2017-08-31

Applicant: JFE STEEL CORPORATION

Inventor： Shinsuke Ide ,  Akihide Matsumoto ,  Atsushi Matsumoto ,  Takatoshi Okabe

IPC: F16L9/17 ,  B23K13/06 ,  B21C37/08 ,  B23K13/00 ,  C22C38/00 ,  C21D9/08 ,  C21D9/50 ,  C22F1/00 ,  C22C38/60 ,  B23K11/00 ,  B23K11/02 ,  B23K11/093 ,  B32B1/08 ,  B32B15/01 ,  C22C19/05 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22F1/10 ,  B23K103/04 ,  B23K101/10

Abstract: Provided is an electric resistance welded clad steel pipe or tube in which a region where solidification microstructure is formed, i.e. a region in a weld particularly having significant influence on properties, is reduced without impairing its function as a clad pipe or tube. An electric resistance welded clad steel pipe or tube comprises: a first layer made of carbon steel or low-alloy steel as base metal; and a second layer placed on one surface of the first layer, and made of stainless steel or a nickel-containing alloy as cladding metal, wherein the base metal is not exposed at a cladding metal-side surface of the electric resistance welded clad steel pipe or tube in a weld, and no solidification microstructure is contained in each of circular sections of 0.1 mm in radius respectively centered at specific three positions in a plane perpendicular to a pipe or tube longitudinal direction.

公开(公告)号：US20180104763A1

公开(公告)日：2018-04-19

申请号：US15555039

申请日：2016-02-17

Applicant: JFE STEEL CORPORATION

Inventor： Toshifumi Kodama ,  Takatoshi Okabe ,  Shuichi Sato

IPC: B23K13/08 ,  B21C37/08 ,  B21C51/00 ,  B23K13/02

Abstract: A method of monitoring a manufacturing status of an electric resistance welded pipe manufactured by shaping a steel strip into a pipe and butt welding both end parts of the steel strip in a width direction along a lengthwise direction includes: arranging an imaging unit in a gas shield nozzle having an opening opposing a region in which both of the end parts of the steel strip in the width direction are butt welded and shielding the region with inert gas by ejecting the inert gas onto the region through the opening, the imaging unit having a visual filed including the region; and determining quality of a butt-welded part based on an image shot by the imaging unit.

公开(公告)号：US20150203933A1

公开(公告)日：2015-07-23

申请号：US14410912

申请日：2013-06-17

Applicant: JFE Steel Corporation

Inventor： Shunsuke Toyoda ,  Sota Goto ,  Takatoshi Okabe ,  Tomohiro Inoue

IPC: C21D9/08 ,  B23K11/087 ,  C21D8/10 ,  C21D6/00 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  F16L9/02 ,  B21C37/08

CPC classification number: C21D9/08 ,  B21C37/08 ,  B23K11/0873 ,  B32B15/011 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/10 ,  C21D8/105 ,  C21D9/50 ,  C21D9/505 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  F16L9/02 ,  Y10T428/12965 ,  Y10T428/12972 ,  Y10T428/12979 ,  Y10T428/13

Abstract: A high strength electric resistance welded steel pipe has a yield strength of 450 MPa or more and excellent resistance to softening for a long period in an intermediate temperature range and a method of manufacturing the steel pipe are provided. The steel pipe has a chemical composition containing, by mass%, C: 0.026% or more and 0.084% or less, Si: 0.10% or more and 0.30% or less, Mn: 0.70% or more and 1.90% or less, Al: 0.01% or more and 0.10% or less, Nb: 0.001% or more and 0.070% or less, V: 0.001% or more and 0.065% or less, Ti: 0.001% or more and 0.033% or less, Ca: 0.0001% or more and 0.0035% or less, in which the condition that Pcm is 0.20 or less is satisfied.

Abstract translation: 高强度电阻焊钢管的屈服强度为450MPa以上，并且在中间温度范围内长期地具有优异的耐软化性，以及钢管的制造方法。 钢管具有以质量％计含有C：0.026％以上且0.084％以下，Si：0.10％以上且0.30％以下，Mn：0.70％以上至1.90％以下的化学成分，Al ：0.01％以上且0.10％以下，Nb：0.001％以上且0.070％以下，V：0.001％以上且0.065％以下，Ti：0.001％以上且0.033％以下，Ca：0.0001 ％以上且0.0035％以下，满足Pcm为0.20以下的条件。

公开(公告)号：US09873164B2

公开(公告)日：2018-01-23

申请号：US14430771

申请日：2013-09-20

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke Toyoda ,  Sota Goto ,  Takatoshi Okabe ,  Atsushi Yonemoto

IPC: B32B5/00 ,  B23K11/00 ,  C21D9/08 ,  C21D9/50 ,  C22C38/00 ,  C22C38/04 ,  B23K11/087 ,  B23K13/02 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  B23K35/30 ,  B21B23/00 ,  B21C37/08 ,  C21D1/60 ,  C21D1/613 ,  C21D6/00 ,  C22C38/20 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  F16L9/02 ,  B23K101/06 ,  B23K103/04

CPC classification number: B23K11/0006 ,  B21B23/00 ,  B21C37/08 ,  B23K11/0873 ,  B23K13/025 ,  B23K35/3053 ,  B23K35/3073 ,  B23K2101/06 ,  B23K2103/04 ,  C21D1/60 ,  C21D1/613 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/08 ,  C21D9/50 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/20 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  F16L9/02 ,  Y10T428/12

Abstract: Electric resistance welded steel pipes or steel tubes with a tensile property TS of not less than 434 MPa which have electric resistance welded parts exhibiting both excellent HIC resistance and excellent low-temperature toughness, and methods for manufacturing such steel pipes or steel tubes.