High-strength porous high-nitrogen nickel-free austenitic stainless steel and method for manufacturing the same

By combining powder metallurgy with high-temperature reduction sintering and nitriding quenching, high-strength porous high-nitrogen nickel-free austenitic stainless steel was prepared, solving the problems of high production cost and insufficient performance in the existing technology, and realizing low-cost, high-efficiency production and high-performance material preparation.

CN117363949BActive Publication Date: 2026-06-26SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Filing Date
2023-09-21
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies make it difficult to produce high-strength, porous, high-nitrogen, nickel-free austenitic stainless steel with controllable porosity, pore size, and shape at low cost on a large scale, and its mechanical properties and corrosion resistance are insufficient.

Method used

Porous high-nitrogen nickel-free austenitic stainless steel is prepared by powder metallurgy through high-temperature reduction sintering and gas-solid nitriding, combined with binders and pore-forming agents. The process includes steps such as powder mixing, cold pressing, degreasing and pre-firing, hydrogen reduction sintering, and nitriding and quenching.

Benefits of technology

This technology enables low-cost, large-scale production of high-strength, porous, high-nitrogen, nickel-free austenitic stainless steel with controllable porosity and pore size. It improves the mechanical properties and corrosion resistance of the material, reduces production costs and time, and uses clean energy to reduce environmental emissions.

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Abstract

The application discloses a kind of high-strength porous high-nitrogen nickel-free austenitic stainless steel and preparation method thereof;The present application adds binder to water, adds nickel-free stainless steel powder after heating and stirs uniformly, dries, grinds, sieves;The pore-forming agent is ground, sieved, then mixed with the sieved nickel-free stainless steel powder uniformly, cold-pressed into green body;Green body is pre-sintered in inert atmosphere, then reduced sintering in hydrogen atmosphere, finally nitrogen infiltration sintering in nitrogen atmosphere, water quenching, to obtain high-strength porous high-nitrogen nickel-free austenitic stainless steel;The temperature of the reduced sintering is 1200-1300 degrees Celsius.The present application is prepared by high-temperature reduction sintering+gas-solid nitrogen infiltration quenching to obtain high-strength porous high-nitrogen nickel-free austenitic stainless steel with excellent mechanical properties (high strength) and excellent corrosion resistance.
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