Arc welded joint
The arc-welded joint with high Mn content and controlled impurity levels addresses the toughness and cost issues of existing materials, providing high strength and cryogenic toughness for liquid hydrogen and helium storage tanks.
WO2026155167A1PCT designated stage Publication Date: 2026-07-23JFE STEEL CORP
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Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- JFE STEEL CORP
- Filing Date
- 2026-01-14
- Publication Date
- 2026-07-23
AI Technical Summary
Technical Problem
Existing welded structures for liquid hydrogen and liquid helium storage tanks lack sufficient toughness at extremely low temperatures, and existing materials are costly, with high Ni content leading to high alloy costs.
Method used
An arc-welded joint using steel plates with a high Mn content and controlled impurity levels, combined with specific weld metal compositions, to achieve excellent cryogenic toughness and weldability while reducing material costs.
Benefits of technology
The arc-welded joint exhibits high strength, excellent cryogenic toughness, and improved weldability, suitable for storage tanks of liquid hydrogen and liquid helium, enhancing safety and lifespan without increasing material costs.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure JP2026000917_23072026_PF_FP_ABST
Abstract
The purpose of the present invention is to provide an arc welded joint. The present invention provides an arc welded joint in which steel sheets are joined to each other via a weld metal, wherein: the steel sheets have a steel sheet composition containing 0.10-0.70% of C, 1.00% or less of Si, 20.0-40.0% of Mn, 0.030% or less of P, 0.0070% or less of S, 0.010-5.000% of Al, 0.500-7.000% of Cr, 0.005-0.050% of N, 0.0050% or less of O, 0.005% or less of Ti, 0.005% or less of Nb, with the balance being made up of Fe and inevitable impurities, and a microstructure having austenite as a matrix phase; and the weld metal has a weld metal composition containing 0.05-1.00% of C, 0.05-1.00% of Si, 25.0-40.0% of Mn, 0.100% or less of P, 0.100% or less of S, 0.005-5.000% of Al, 0.400-10.000% of Cr, 0.400% or less of N, 0.1500% or less of O, with the balance being made up of Fe and inevitable impurities, and a microstructure having austenite as a matrix phase.
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