Title:
溶接継手及びその製造方法
Document Type and Number:
Japanese Patent JP7385831
Kind Code:
B2
Abstract:
To provide a high-Mn steel weld joint excellent in low-temperature toughness.SOLUTION: A weld joint is produced by welding connection of a couple of high-Mn steel materials including Mn of 15.0 mass% or more and Cr of 2.5 mass%. In a weld heat-affected zone of the weld joint, the average length of elliptically approximating long axis of carbide existing in the above zone is 0.50 μm or less, and an average aspect ratio thereof is 5.0 or less. The Cr crystallizing as the carbide is 800 mass ppm or less based on total mass of steel materials. The Cr depletion layer of a grain boundary is 800 mm or less in width, and the Cr depletion amount of the above layer is 1.5 mass% or less in a host phase Cr amount reference. The weld heat-affected zone having such a conformation is obtained by a welding operation in which a one-pass heat input amount is 3.0 kJ/mm or less in the case where the board thickness of a material to be welded is more than 10 mm, and is 2.0 kJ/mm or less in that thickness of 10 mm or less. The weld heat-affected zone having such conformation is excellent in low-temperature toughness.SELECTED DRAWING: None
Inventors:
Rinno Ishida
Jiro Nakamichi
Izumi Daichi
Keiji Ueda
Jiro Nakamichi
Izumi Daichi
Keiji Ueda
Application Number:
JP2020160722A
Publication Date:
November 24, 2023
Filing Date:
September 25, 2020
Export Citation:
Assignee:
JFE Steel Corporation
International Classes:
C22C38/00; B23K9/23; C22C38/38; C22C38/58
Domestic Patent References:
| JP2007126715A | ||||
| JP58096853A | ||||
| JP2017502842A | ||||
| JP2016507648A | ||||
| JP2014084493A | ||||
| JP2019183203A |
Foreign References:
| KR102086266B1 | ||||
| KR1020190077192A |
Attorney, Agent or Firm:
Kenichiro Ochiai