Austenitic material with high corrosion resistance and high strength and method for the production thereof

By reducing manganese and nickel and optimizing carbon-to-nitrogen ratios, the austenitic materials achieve high strength, toughness, and corrosion resistance, addressing the limitations of existing technologies through a simplified production process.

EP4764004A1Pending Publication Date: 2026-06-24VOESTALPINE BOEHLER EDELSTAHL GMBH & CO KG
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Patent Information

Application Number
EP2024221687
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2026-06-24

AI Technical Summary

Technical Problem

Existing austenitic materials face challenges in achieving high strength, toughness, and corrosion resistance while maintaining a low magnetic permeability, often requiring complex and costly processing steps due to high manganese and nickel contents, which can lead to precipitation and segregation issues.

Method used

Austenitic materials with reduced manganese and nickel contents, supplemented by increased chromium and nitrogen, along with precise carbon-to-nitrogen ratios, are produced through a simplified manufacturing process, ensuring a homogeneous, precipitation-free microstructure with high strength and corrosion resistance.

Benefits of technology

The solution results in materials with improved corrosion resistance, high strength, and toughness, maintaining a non-magnetic austenitic microstructure, suitable for applications in aggressive environments without the need for expensive remelting processes.

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Abstract

Austenitic material comprising or consisting of the following elements (all values ​​in wt.%): Elements Carbon (C) 0.05 - 0.30 Silicon (Si) < 0.50 Manganese (Mn) 8.50 - 13.00 Phosphorus (P) < 0.05 Sulfur (S) < 0.005 Chromium (Cr) 18.00 - 22.50 Molybdenum (Mo) 0.50 - 5.00 Nickel (Ni) 0.50 - 6.00 Vanadium (V) < 0.50 Tungsten (W) < 3.00 Copper (Cu) < 0.50 Cobalt (Co) < 0.50 Titanium (Ti) < 0.50 Aluminum (Al) < 0.50 Niobium (Nb) < 0.03 Boron (B) < 0.01 Nitrogen (N) 0.40 - 0.80 Balance Iron and unavoidable impurities, where: Formula A [wt%]: 0.55 ≤ (C + N) ≤ 0.95 Formula B [-]: 0.07 ≤ (C / N) ≤ 0.50 and where Formula A is given in wt% and Formula B is dimensionless.
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Citation Information

Patent Citations

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    AT412727B

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    CN104195446A

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  • A paramagnetic, corrosion resistant austenitic steel with high elasticity, strength and toughness and a process for its manufacture

    EP1069202A1