公开(公告)号：US12209294B2

公开(公告)日：2025-01-28

申请号：US17288712

申请日：2019-10-25

Applicant: POSCO

Inventor： Jae-Yong Chae

IPC: C21D9/50 ,  B23K9/23 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

Abstract: The present invention relates to a steel material used as materials for building structures, ship structures, offshore structures, or the like and, more specifically, to a steel material having low yield ratio and excellent weld heat affected zone toughness and a manufacturing method therefor.

公开(公告)号：US20250019789A1

公开(公告)日：2025-01-16

申请号：US18713458

申请日：2022-11-30

Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

Inventor： Denis SORNIN

IPC: C21D9/50 ,  B23K9/025 ,  C21D6/00 ,  C21D9/46

Abstract: A method for manufacturing a double-layer heat-exchange wall including first and second metal layers includes the following successive steps: (i) providing a first metal sheet forming the first layer, a second metal sheet forming the second layer, and a leaf of iron Fe0 having a thickness of between 10 μm and 100 μm; (ii) assembling the first and second metal sheets and the leaf of iron Fe0, the leaf interposed between the first and second metal sheets; (iii) mechanical pressing of the assembly at a minimum pressure of 1 MPa; (iv) peripheral welding of the pressed assembly; and (v) heat treatment of the welded assembly, the heat treatment being implemented by hot isostatic pressing conducted at a temperature of between 800° C. and 1200° C., at a pressure of between 108 Pa and 2.108 Pa, for a period of between 1 hour and 3 hours.

公开(公告)号：US12172487B2

公开(公告)日：2024-12-24

申请号：US17254394

申请日：2019-04-24

Applicant: JFE Steel Corporation

Inventor： Masatoshi Aratani ,  Ryoji Matsui ,  Tomonori Kondo ,  Shinsaku Kokubo

IPC: C21D6/00 ,  B21C37/08 ,  B21D7/025 ,  B23K11/08 ,  B60G21/055 ,  C21D8/10 ,  C21D9/08 ,  C21D9/50 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/26 ,  C22C38/42 ,  C22C38/50 ,  C22C38/54

Abstract: An electric resistance welded steel pipe for manufacturing a hollow stabilizer has a Lankford value in a pipe longitudinal direction of from 0.7 to less than 1.0. The electric resistance welded steel pipe is subjected to cold bending and then to a heat treatment including quenching and tempering to manufacture a stabilizer. The cold bending is cold rotary draw bending. When bent with a bend radius of from 1.0 times to 3.0 times an outer diameter of the pipe before cold bending, a flattening ratio is from 0% to 10%, a thickness reduction rate on a bending outside and a thickness increase rate on a bending inside are from 0% to 10%, and additionally, a circumferential length change of a bending center portion is from 0% to 10%. A Vickers hardness of the stabilizer after the heat treatment is adjusted to from 400 HV to less than 580 HV.

公开(公告)号：US12104220B2

公开(公告)日：2024-10-01

申请号：US18120222

申请日：2023-03-10

Applicant: ASIATECH CO., LTD.

Inventor： Young Jin Lee

IPC: C21D9/50 ,  B60B17/00 ,  C21D6/00 ,  C22C38/02 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

CPC classification number: C21D9/50 ,  B60B17/0006 ,  C21D6/004 ,  C21D6/005 ,  C22C38/02 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

Abstract: The present disclosure relates to a welding base metal for recycling a railway wheel and a method for recycling a railway wheel using the same, which can overlay-weld a railway wheel with a welding base metal suitable for overlay-welding a railway wheel through a heat treatment, form a surface hardened layer, and strengthen the metal structure of the railway wheel, in order to recycle the railway wheel.
The welding base metal for recycling a railway wheel may be used as a surface hardened layer of a railway wheel because the welding base metal has high hardness while exhibiting a similar property to the railway wheel. Furthermore, the welding base metal can change the metal structure of the recycled railway wheel, and thus delay the initial wear time of the recycled railway wheel. The method for recycling a railway wheel may overlay-weld the damaged railway wheel to its original size, form a surface hardened layer, and change the metal structure of the railway wheel by changing the composition of the welding base metal and performing the pre-heat treatment and the post heat treatment, thereby minimizing the occurrence of damage to the recycled railway wheel.

公开(公告)号：US12036600B2

公开(公告)日：2024-07-16

申请号：US17298131

申请日：2019-11-25

Applicant: POSCO ,  AUSTEM CO., LTD.

Inventor： Hong-Woo Lee ,  Dong-Yoon Seok ,  Myong-Ho Shin ,  Nam-Sik Sa

IPC: B21D5/10 ,  B21C37/08 ,  B21D22/02 ,  B21D53/88 ,  B23K31/02 ,  C21D9/08 ,  C21D9/50 ,  B21C37/16 ,  B23K37/00

CPC classification number: B21D5/10 ,  B21C37/0803 ,  B21D22/02 ,  B21D53/88 ,  B23K31/027 ,  C21D9/085 ,  C21D9/50 ,  B21C37/16 ,  B23K37/003

Abstract: The present invention provides a method for manufacturing a torsion beam, the method comprising: a planarization step, in which a protruding portion of an upper mold presses the opposite end portions in the width direction of the blank to be plastically deformed to be flat while the opposite end portions in the width direction of the blank are supported by a side cam to face each other; a welding and bonding step for bonding the planarized opposite end portions in the width direction of the blank via welding; and a quenching step for heating the welded and bonded blank within a range of 900 to 970° C. for a retaining time within a range of 1 to 20 minutes and for cooling down the blank in a treatment liquid including at least one of water and oil in a range of 20 to 90° C.

公开(公告)号：US11866801B2

公开(公告)日：2024-01-09

申请号：US17477073

申请日：2021-09-16

Applicant: PanGang Group Panzhihua Iron & Steel Research Institute Co., Ltd.

Inventor： Xin Lu ,  Dadong Li ,  Wei Bai ,  Feixiang Xu

IPC: C21D9/50 ,  C21D8/00 ,  C21D9/04

CPC classification number: C21D9/505 ,  C21D8/005 ,  C21D9/04 ,  C21D2211/003 ,  C21D2211/009

Abstract: The present disclosure relates to the technical field of rails welding, and particularly to a method for optimizing microstructure of a rail welded joint, the method comprises the following steps: step 1): subjecting a rail web area of a to-be-cooled welded joint which is obtained by flash butt welding to an accelerated cooling by means of an accelerated cooling device and by using compressed air as a cooling medium, measuring and monitoring temperature of a central position of the rail web of the welded joint while cooling; step 2): stopping the accelerated cooling when the temperature of the central position of the rail web drops to a preset temperature, then placing the welded joint in air and naturally cooling to room temperature, wherein the rail is a pearlite rail having a carbon content of 0.6-0.9 wt %.

公开(公告)号：US20230399051A1

公开(公告)日：2023-12-14

申请号：US18450472

申请日：2023-08-16

Applicant: ArcelorMittal

Inventor： Cristian ALVAREZ ,  Thierry LIZON ,  Maria POIRIER

IPC: B62D21/15 ,  B23K26/60 ,  B21D22/02 ,  B23K26/00 ,  B23K26/24 ,  B23K33/00 ,  B23K35/24 ,  B23K35/38 ,  B62D27/02 ,  C21D6/00 ,  C21D9/50 ,  C22C19/05 ,  C22C30/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

CPC classification number: B62D21/15 ,  B23K26/60 ,  B21D22/022 ,  B23K26/0006 ,  B23K26/24 ,  B23K33/00 ,  B23K35/24 ,  B23K35/383 ,  B62D27/02 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D9/505 ,  C22C19/057 ,  C22C30/02 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  B23K2101/185

Abstract: A method for producing a welded blank (1) includes providing two precoated sheets (2), butt welding the precoated sheets (2) using a filler wire. The precoating (5) entirely covers at least one face (4) of each sheet (2) at the time of butt welding. The filler wire (20) has a carbon content between 0.01 wt. % and 0.45 wt. %. The composition of the filler wire (20) and the proportion of filler wire (20) added to the weld pool is chosen such that the weld joint (22) has (a) a quenching factor FTWJ: FTWJ−0.9FTBM≥0, where FTBM is a quenching factor of the least hardenable substrate (3), and FTWJ and FTBM are determined: FT=128+1553×C+55×Mn+267×Si+49×Ni+5×Cr−79×Al−2×Ni2−1532×C2−5×Mn2−127×Si2−40×C×Ni−4×Ni×Mn, and (b) a carbon content CWJ 5000, where FA=10291+4384.1×Mo+3676.9Si−522.64×Al−2221.2×Cr−118.11×Ni−1565.1×C−246.67×Mn.

公开(公告)号：US11833777B2

公开(公告)日：2023-12-05

申请号：US17055041

申请日：2019-05-15

Applicant: BAOSHAN IRON & STEEL CO., LTD.

Inventor： Zhiyu Wang ,  Sihai Jiao ,  Shaoming Qiang ,  Huawei Zhang

IPC: B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C21D9/50 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/44

CPC classification number: B32B15/011 ,  C21D6/004 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C21D9/50 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/44 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/009

Abstract: Disclosed in the present invention is a high-strength double-sided stainless steel clad sheet, including a substrate layer, and stainless steel clad layers clad-rolled on double sides of the substrate layer. The substrate layer consists, in mass percent, the chemical elements: C: 0.03-0.12%, 0

公开(公告)号：US11821053B2

公开(公告)日：2023-11-21

申请号：US15738776

申请日：2016-06-30

Applicant: MAGNA INTERNATIONAL INC.

Inventor： John Richard Potocki ,  Steven Reece Falter

IPC: C21D9/50 ,  B23K26/00 ,  C21D1/34 ,  C22F1/04 ,  B23K9/167 ,  B23K9/173 ,  B23K31/02 ,  B23K101/00 ,  C21D1/09 ,  C21D1/26

CPC classification number: C21D9/50 ,  B23K9/167 ,  B23K9/173 ,  B23K26/00 ,  B23K31/02 ,  C21D1/34 ,  C22F1/04 ,  B23K2101/006 ,  C21D1/09 ,  C21D1/26

Abstract: A method for conditioning a welded vehicle body assembly is provided. The method includes welding the vehicle body member to at least one additional vehicle body member together to form the welded vehicle body assembly, the welded vehicle body assembly includes a weld area; and laser annealing a weld heat affected zone adjacent to the weld area to soften material in the weld heat affected zone.

公开(公告)号：US20230183831A1

公开(公告)日：2023-06-15

申请号：US17801019

申请日：2021-02-24

Applicant: Multimatic Inc.

Inventor： Mark Sullivan

IPC: C21D9/08 ,  B21K21/12 ,  B23K9/028 ,  B23K9/173 ,  B23K9/235 ,  B23K33/00 ,  C21D9/50 ,  C21D8/10 ,  C21D1/56 ,  C21D1/18

CPC classification number: C21D9/085 ,  B21K21/12 ,  B23K9/0282 ,  B23K9/173 ,  B23K9/235 ,  B23K33/008 ,  C21D9/505 ,  C21D8/105 ,  C21D1/56 ,  C21D1/18 ,  C21D2211/008

Abstract: A process for preparing a multi-thickness welded steel vehicle rail, the process comprises the steps of: (a) forming a first tube having a first outer diameter, an inner diameter and a first wall thickness; (b) forming a second tube having the first outer diameter, a second inner diameter and a second wall thickness different than the first wall thickness; (c) swaging a first end of the first tube to a second outer diameter less than the second inner diameter of the second tube; (d) inserting the swaged first end of the first tube into an end of the second tube to form a joint; (e) welding the first tube and the second tube together to form a weld at the joint to form a tube blank with a heat affected zone of lower metal strength in the area of the weld; (f) preheating the tube blank to create a common crystalline microstructure along a length of the tube blank; (g) introducing the tube blank into a blow molding tool having inner molding walls; (h) molding the tube blank at an elevated temperature by expanding the tube blank against the inner molding walls of the molding tool by injecting a pressurized medium into an interior cavity of the tube blank; and (i) quenching the tube blank by replacing the pressurized medium with a cooling medium through the molding tool and the tube blank to achieve a rapid cooling effect on the tube blank and to create a completed vehicle rail with essentially uniform material strength across the weld. A completed vehicle rail has an overlapped welded structure and uniform microcrystalline structure along the length of the rail.