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Austenitic stainless steel having improved hydrogen embrittlement resistance, and high-pressure hydrogen gas container comprising same

An austenitic system and high-pressure hydrogen technology, which is applied in the direction of pressure vessels, outer walls of vessel structures, fluid treatment, etc., can solve the problems of corrosion resistance and mechanical performance degradation, achieve excellent resistance to hydrogen embrittlement, reduce manufacturing costs, reduce Effect of Ni content

Inactive Publication Date: 2019-08-30
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the excessive reduction of Ni, a large amount of Mn and Cu needs to be added, and there is a possibility that the corrosion resistance and mechanical properties will be lowered due to the generation of MnS

Method used

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  • Austenitic stainless steel having improved hydrogen embrittlement resistance, and high-pressure hydrogen gas container comprising same
  • Austenitic stainless steel having improved hydrogen embrittlement resistance, and high-pressure hydrogen gas container comprising same
  • Austenitic stainless steel having improved hydrogen embrittlement resistance, and high-pressure hydrogen gas container comprising same

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Experimental program
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Effect test

Embodiment 1

[0095] The SFE of embodiment 1 is 57.8mJ / m 2 , belongs to 40~70mJ / m 2 In the range of , so as to produce twins (Twin) in the strain, the SFE of comparative example 4 is 75.2mJ / m 2 , exceeding 40~70mJ / m 2 range, resulting in HDDW rather than twinning in strain.

[0096] From the results of Example 11, it can be seen that when Nb is added, crystal grains are refined, and the tensile strength shows a high value of 840 MPa or more.

[0097] From the results of Example 6, it can be seen that by adjusting the austenite stabilizing elements, the Ni of 27 or more required in the present invention can be obtained eq , so that a low strain-induced martensite fraction of less than 1% can be obtained even in a high-pressure hydrogen environment, and excellent hydrogen embrittlement resistance with an RRA of 0.8 or more can be obtained.

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Abstract

Disclosed are an austenitic stainless steel having improved hydrogen embrittlement resistance, and a high-pressure hydrogen gas container. The austenitic stainless steel according to one embodiment ofthe present invention comprises by wt%: 0.1% or less (excluding 0) of C; 1.0% or less (excluding 0) of Si; 2.0% to 7.0% of Mn; 15% to 25% of Cr; 7% to less than 10% of Ni; 0.4% or less (excluding 0)of N, and the balance of Fe and other inevitable impurities, wherein the stacking fault energy (SFE) defined by the following formula (1) is 40-70 mJ / m2.

Description

technical field [0001] The present invention relates to an austenitic stainless steel and a container for high-pressure hydrogen containing the same, and more specifically, to an austenitic stainless steel with improved resistance to hydrogen embrittlement and a container for high-pressure hydrogen containing the same. Background technique [0002] As the development and spread of fuel cell vehicles using hydrogen as fuel expands, the development of containers and components for storing hydrogen is required. A hydrogen storage container is also required for a fuel cell vehicle or a hydrogen charging station that handles the fuel of a fuel cell vehicle, and the hydrogen storage container is composed of various parts such as a storage tank, valves, and piping. In order to store high-pressure hydrogen gas for fuel cells and various uses, high mechanical strength, resistance to hydrogen embrittlement, corrosion resistance, etc. are required. [0003] At present, the material co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/00C22C38/44
CPCC22C38/001C22C38/02C22C38/44C22C38/48C22C38/58Y02E60/32C21D2211/001F17C1/14F17C2203/0604F17C2203/0619F17C2203/0643F17C2221/012F17C2223/036F17C2260/011F17C2270/0184
Inventor 金光珉金成俊金志洙
Owner POHANG IRON & STEEL CO LTD
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