公开(公告)号：EP4239097A1

公开(公告)日：2023-09-06

申请号：EP21906123.1

申请日：2021-10-13

申请人： JFE Steel Corporation

发明人： WATANABE, Kazufumi ,  TAKADA, Atsushi ,  ANDO, Akiyoshi ,  OKABE, Takatoshi ,  UEDA, Keiji

IPC分类号： C22C38/00 ,  B23K35/30 ,  B23K35/362 ,  B23K35/368

摘要： A submerged arc welding wire is provided that can favorably weld a high-Mn content steel material for cryogenic environment use and can reduce the occurrence of hot crack during welding, namely, has excellent hot crack resistance.
The submerged arc welding wire 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：EP4353404A1

公开(公告)日：2024-04-17

申请号：EP22861054.9

申请日：2022-07-28

申请人： JFE Steel Corporation

发明人： ANDO, Akiyoshi ,  TAKADA, Atsushi ,  WATANABE, Kazufumi ,  OKABE, Takatoshi

IPC分类号： B23K35/30 ,  B23K35/362

CPC分类号： B23K35/30 ,  C22C38/00 ,  C22C38/58 ,  B23K35/362

摘要： An object is to provide a submerged arc welding wire that generates less fumes at the time of welding and can form a weld metal with high strength and excellent cryogenic toughness to find suitable use as a welding material for high-Mn content steel materials for use in cryogenic environments.
A metal-cored wire for submerged arc welding contains specific components.

公开(公告)号：EP4257281A1

公开(公告)日：2023-10-11

申请号：EP22763153.8

申请日：2022-02-28

申请人： JFE Steel Corporation

发明人： WATANABE, Kazufumi ,  TAKADA, Atsushi ,  ANDO, Akiyoshi ,  OKABE, Takatoshi ,  UEDA, Keiji

IPC分类号： B23K35/30 ,  B23K9/167 ,  C21D8/06 ,  C22C38/00 ,  C22C38/38 ,  C22C38/58

摘要： A TIG welded joint in a high-Mn content steel material is provided that can be formed with reduced occurrence of hot cracking during the welding process and has high strength and excellent cryogenic impact toughness.
In the TIG welded joint, the high-Mn content steel material has a chemical composition including, by mass%, C: 0.10 to 0.80%, Si: 0.05 to 1.00%, Mn: 18.0 to 30.0%, P: 0.030% or less, S: 0.0070% or less, Al: 0.010 to 0.070%, Cr: 2.5 to 7.0%, N: 0.0050 to 0.0500%, and O: 0.0050% or less, the balance being Fe and incidental impurities, and a weld metal has a chemical composition including C: 0.10 to 0.80%, Si: 0.05 to 1.00%, Mn: 15.0 to 30.0%, P: 0.030% or less, S: 0.030% or less, Al: 0.100% or less, Cr: 6.0 to 14.0%, and N: 0.100% or less, the balance being Fe and incidental impurities.

公开(公告)号：EP4253588A1

公开(公告)日：2023-10-04

申请号：EP22763152.0

申请日：2022-02-28

申请人： JFE Steel Corporation

发明人： WATANABE, Kazufumi ,  TAKADA, Atsushi ,  ANDO, Akiyoshi ,  OKABE, Takatoshi ,  UEDA, Keiji

IPC分类号： C22C38/00 ,  C22C38/38 ,  B23K35/30 ,  B23K9/18

摘要： A submerged arc welded joint in a high-Mn content steel material is provided that can be formed with reduced occurrence of hot cracking during the welding process and has high strength and excellent cryogenic impact toughness.
In the welded joint, the high-Mn content steel material has a chemical composition including, by mass%, C: 0.10 to 0.80%, Si: 0.05 to 1.00%, Mn: 18.0 to 30.0%, P: 0.030% or less, S: 0.0070% or less, Al: 0.010 to 0.070%, Cr: 2.5 to 7.0%, N: 0.0050 to 0.0500%, and 0: 0.0050% or less, the balance being Fe and incidental impurities; and a weld metal has a chemical composition including C: 0.10 to 0.80%, Si: 0.05 to 1.00%, Mn: 15.0 to 30.0%, P: 0.030% or less, S: 0.030% or less, Al: 0.100% or less, Cr: 6.0 to 14.0%, and N: 0.100% or less, the balance being Fe and incidental impurities.

公开(公告)号：EP4365326A1

公开(公告)日：2024-05-08

申请号：EP22864514.9

申请日：2022-08-29

申请人： JFE Steel Corporation

发明人： ANDO, Akiyoshi ,  TAKADA, Atsushi ,  WATANABE, Kazufumi ,  OKABE, Takatoshi ,  UEDA, Keiji ,  SUZUKI, Masamichi ,  HAN, Peng

IPC分类号： C22C38/00 ,  C22C38/58 ,  B23K35/30 ,  B23K35/362 ,  B23K35/368 ,  B23K9/18

CPC分类号： B23K9/18 ,  B23K35/30 ,  B23K35/362 ,  B23K35/368 ,  C22C38/00 ,  C22C38/58

摘要： Provided is a submerged arc welding method that produces little fume, has good weldability, and is suitable for welding high-Mn-containing steel materials to be used in cryogenic environments. The method includes welding with a combination of a wire having a predetermined chemical composition and flux having a basicity [BL] of 1.5 to 2.4, while adjusting a welding heat input according to a groove cross-sectional area. In this way, a weld metal with high strength and excellent cryogenic impact toughness where the 0.2 % proof stress at room temperature is 400 MPa or more and an absorbed energy (vE-196) in the Charpy impact test is 28 J or more can be easily manufactured.