Austenitic stainless steel and manufacturing method therefor, and device for hydrogen including austenitic stainless steel

Austenitic stainless steel with controlled composition and manufacturing processes addresses strength and hydrogen embrittlement challenges, enhancing resistance and reducing costs for high-pressure hydrogen applications.

WO2026135123A1PCT designated stage Publication Date: 2026-06-25POHANG IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
POHANG IRON & STEEL CO LTD
Filing Date
2025-12-16
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing materials for high-pressure hydrogen environments face challenges in balancing strength, hydrogen embrittlement resistance, and cost, with methods like cold working and precipitation strengthening leading to increased costs and susceptibility to hydrogen embrittlement.

Method used

An austenitic stainless steel with controlled composition and compositional relationships, including specific elements and precipitate stability, to enhance strength and hydrogen embrittlement resistance, achieved through precise manufacturing processes.

Benefits of technology

The solution provides an austenitic stainless steel with improved hydrogen embrittlement resistance and strength, suitable for high-pressure hydrogen environments, maintaining mechanical integrity and reducing material costs.

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Abstract

An austenitic stainless steel according to the present invention comprises, by wt%, 0.10% or less (excluding 0) of C, 1.5% or less (excluding 0) of Si, 8-15% of Mn, 17.0-23.0% of Cr, 2.00-8.00% of Ni, 0.10-1.00% of Nb+V, 0.15-0.40% of N, and the remainder of Fe and inevitable impurities, wherein the value of formula (1) is 1.52 to 2.70, the relative notch tensile strength (RNTS) under hydrogen environment is 0.92 or more, and the room temperature tensile strength is 750 MPa or more. Formula (1): ([Nb]+[V]+[C]+[N]) / ([C]+[N]), where [Nb], [V], [C], and [N] represent wt% of each element.
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