Austenitic stainless steel material

An austenitic and stainless steel technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., to achieve high tensile strength and excellent resistance to hydrogen embrittlement

Active Publication Date: 2022-01-11
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a high-pressure hydrogen environment, hydrogen-induced embrittlement (hydrogen embrittlement) may occur even in stainless steel

Method used

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  • Austenitic stainless steel material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0178] The effect of the austenitic stainless steel material of this embodiment is demonstrated more concretely through an Example. The conditions in the following examples are examples of conditions employed to confirm the feasibility and effects of the austenitic stainless steel material of the present embodiment. Therefore, the austenitic stainless steel material of this embodiment is not limited to this one conditional example.

[0179] 180 kg of austenitic stainless steel having the chemical composition shown in Table 1 was vacuum melted to produce an ingot.

[0180] [Table 1]

[0181] Table 1

[0182]

[0183] The ingot was subjected to hot forging and hot rolling to manufacture a steel plate (intermediate steel material) having a width of 200 mm×a thickness of 20 mm. In any of the test numbers (see Table 2), the heating temperature T0 (°C) during hot forging and the holding time t0 (minutes) at the heating temperature T0 (°C) are as shown in Table 2. The reductio...

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Abstract

Provided is an austenitic stainless steel material having excellent hydrogen embrittlement resistance and high strength. This austenitic stainless steel material has a chemical composition in terms of mass% of no more than 0.100% C, no more than 1.00% Si, no more than 5.00% Mn, 15.00-22.00% Cr, 10.00-21.00% Ni, 1.20-4.50% Mo, no more than 0.050% P, no more than 0.050% S, no more than 0.100% Al, no more than 0.100% N, and 0-0.70% Cu, the remainder comprising Fe and impurities, the austenitic grain size number based on ASTM E112 of the austenitic stainless steel material is 5.0 to less than 8.0, the dislocation cell structure ratio in a cross section perpendicular to the longitudinal direction of the austenitic stainless steel material is 50% to less than 80%, and the number density of deposits having a major axis of 1.0 um or greater is 5.0 / 0.2 mm2 or less.

Description

technical field [0001] The present disclosure relates to austenitic stainless steels. Background technique [0002] In recent years, the development of fuel cell vehicles that use hydrogen as fuel and the practical research of hydrogen refueling stations that supply hydrogen to fuel cell vehicles have been progressing. Stainless steel is one of the candidate materials for these uses. However, in a high-pressure hydrogen environment, hydrogen-induced embrittlement (hydrogen embrittlement) may occur even in stainless steel. SUS316L is allowed to be used as a stainless steel material with excellent hydrogen embrittlement resistance in the standards for compressed hydrogen containers for automobiles stipulated in the Japanese High Pressure Gas Safety Act. [0003] However, considering the weight reduction of fuel cell vehicles, the compactness of hydrogen refueling stations, and the need for high-pressure operations at hydrogen refueling stations, it is expected that stainless...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/58C22C38/04C22C38/44C22C38/06C22C38/42C21D8/02C21D8/06
CPCC22C38/02C22C38/58C22C38/04C22C38/44C22C38/06C22C38/001C22C38/42C21D8/0205C21D8/065C21D2211/001C21D8/0226C21D8/0236C21D8/0263C21D6/004C21D6/005C21D9/46C21D2211/004C21D1/18C21D8/0221C21D8/105C22C38/60C21D6/008C22C38/002
Inventor 山村实早保中村润
Owner NIPPON STEEL CORP
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