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Austenite steel welded joint

A technology for welded joints and austenitic steel, which is applied to welding media, welding equipment, welding equipment, etc., can solve the problems of increased manufacturing costs, achieve improved stability, high strength and hydrogen embrittlement resistance, excellent durability Effect of hydrogen embrittlement properties

Active Publication Date: 2014-03-19
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, when considered as an actual large-scale structure, the implementation of such a long-term post-welding heat treatment may become a large limitation and lead to an extremely high increase in manufacturing costs.

Method used

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  • Austenite steel welded joint
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  • Austenite steel welded joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0091] The materials with symbols A to C with the chemical composition shown in Table 1 were melted and cast in the laboratory to obtain steel ingots, and the steel ingots were hot forged, hot rolled, heat treated and machined to produce plates with a thickness of 3 mm, a width of 50 mm, and a length of 100 mm. The steel plate is used as the base metal for welding.

[0092] Materials with symbols V to Z having the chemical composition shown in Table 2 were melted and cast in a laboratory to obtain steel ingots, and welding wires (welding materials) with an outer diameter of 1.2 mm were produced from the steel ingots by hot forging, hot rolling and machining.

[0093] In the longitudinal direction of the above-mentioned steel plate for welding base material, implement figure 1 After the groove processing shown, the base metal, welding material and welding conditions are combined as shown in Table 3, and the butt welding is performed by the gas tungsten arc welding method. Wel...

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Abstract

This austenite steel weld joint is welded by a gas tungsten arc welding method using an austenite steel base material that has a specific chemical composition and using an austenite steel welding material that has a specific chemical composition. The chemical composition of the welding metal contains C <= 0.1%, Si <= 0.8%, Mn: 1.5-5.5%, Ni: 8-15%, Cr: 18-24%, Al<0.05%, and N: 0.15-0.35% and, as necessary, contains one or more of V <= 0.5%, Nb <= 0.5%, and Mo <= 4.5%, with the remainder being formed from Fe and impurities. The impurities are O <= 0.02%, P <= 0.05%, and S <= 0.03%, the chemical composition satisfies [413-462(C + N)-9.2Si-8.1Mn-13.7Cr-9.5Ni-18.5Mo=-70], and an austenite steel weld joint in which the amount of ferrite in the welding metal is 20% or less by area ratio is provided with both high strength and excellent resistance to hydrogen embrittlement, which are characteristics required for high-pressure hydrogen gas pipes, even when post weld heat treatment is not carried out.

Description

technical field [0001] The present invention relates to austenitic steel welded joints. Specifically, it relates to a welded joint having not only high strength required for high-pressure gas piping, but also high strength and excellent hydrogen embrittlement resistance characteristics required for high-pressure hydrogen piping. Background technique [0002] In recent years, the practical research of transportation equipment using hydrogen, natural gas, etc. as energy has been actively progressing. For this practical application, it is necessary to prepare a service environment where these gases can be stored and transported at high pressure, and at the same time, the development and application research of high-strength materials with a tensile strength exceeding 800 MPa used here are progressing. [0003] Based on this background, as materials to be used, for example, Patent Documents 1 to 3 propose that the solubility of N can be improved by increasing Mn, and that the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K9/167B23K9/23C22C38/58
CPCB23K2201/04C22C38/58B23K2201/10C22C38/001C22C38/002C22C38/02C22C38/46B23K35/308C22C38/48C22C38/44B23K35/3053C22C38/06B23K9/167C21D9/50B23K2201/06B23K35/3086Y10T428/12965Y10T428/12972Y10T428/12979B23K2101/04B23K2101/06B23K2101/10C22C38/04C22C38/18C22C38/40
Inventor 平田弘征大村朋彦富尾悠索中村润
Owner NIPPON STEEL CORP
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