Austenitic stainless steel and manufacturing method therefor

EP4431631A4Pending Publication Date: 2025-10-22POHANG IRON & STEEL CO LTD
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Patent Information

Application Number
EP2022907677
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2021-12-16
Filing Date
2022-10-25
Publication Date
2025-10-22

AI Technical Summary

Technical Problem

Austenitic stainless steels face limitations in yield strength and elongation due to high costs and low price-competitiveness, primarily due to the high content of alloying elements like nickel, which also affects corrosion resistance and formability.

Method used

The development of an austenitic stainless steel with a composition of 0.005 to 0.060% C, 0.1 to 1.5% Si, 5.0 to 10.0% Mn, 14.0 to 18.0% Cr, and 0.01 to 0.25% N, with a specific α and β value range, and an average grain size of 5.0 µm or less, achieved through hot rolling, cold rolling, and low-temperature annealing, minimizing nickel content and optimizing austenitic stability parameters.

Benefits of technology

This approach results in an austenitic stainless steel with high yield strength, elongation, and corrosion resistance, while maintaining price-competitiveness, suitable for structural applications like automobile and construction parts, with improved formability and reduced nickel usage.

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Abstract

The present disclosure relates to an austenitic stainless steel and a manufacturing method therefor, and specifically, to an austenitic stainless steel and a manufacturing method therefor, wherein the austenitic stainless steel can secure both excellent strength and ductility even after undergoing low-temperature annealing and have excellent competitiveness and corrosion resistance.
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Citation Information

Patent Citations

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    US20220403491A1

  • Low-cost austenitic stainless steel having high strength and high formability, and method for manufacturing same

    US20230142021A1

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    WO2021010599A2

  • Austenitic stainless steel having increased yield ratio and manufacturing method thereof

    WO2021085800A1

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    WO2021215630A1