一种纳米复合析出强化奥氏体超硬钢材及其制备方法

By using specific components and heat treatment processes, the problems of insufficient hardness and wear resistance of austenitic stainless steel were solved, and high-strength, high-hardness nanocomposite precipitation-strengthened austenitic ultra-hard steel was prepared. This solved the problems of grain growth and iron oxide scale formation, and achieved high-performance steel.

CN121992313BActive Publication Date: 2026-07-17DONGGUAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGGUAN UNIV OF TECH
Filing Date
2026-02-05
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing austenitic stainless steels have poor hardness and wear resistance, and high-temperature treatment can easily lead to grain growth, iron oxide scale formation, and internal stress, affecting material properties.

Method used

By employing specific combinations of components (C, Mn, Ni, Cr, Mo, V, Cu, Si, Ti, N, Al, Ce) and precise heat treatment processes, including vacuum smelting, casting, electroslag remelting, forging, hot rolling, and aging treatment, grain size and precipitate distribution are controlled, and harmful phase formation is avoided through solid solution and aging strengthening.

Benefits of technology

High-strength, high-hardness nanocomposite precipitation-strengthened austenitic ultra-hard steel was prepared, with an HRC of 48.8, a tensile strength of 1375 MPa, and a grain size of 30-50 μm. This process avoided liquid phase precipitation and microcracks, resulting in high-performance steel.

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Abstract

本发明涉及奥氏体不锈钢技术领域，尤其是指一种纳米复合析出强化奥氏体超硬钢材及其制备方法，合金成分重量百分比为：C:0.75~0.9wt.%、Mn:5.5~8.5wt.%、Ni:6.0~10.0wt.%、Cr:10.0~13.0wt.%、Mo:1.0~2.5wt.%、V：2.0~2.5wt.%、Cu:2.0~4.0 wt.%、Si:0.2~1.0 wt.%、Ti：0.03~0.100wt.%、N:0.05~0.20wt.%、Al:0.2~0.8wt.%、Ce:0.01~0.015 wt.%、余量为Fe。本发明所得到的钢材的HRC最高可达48.8，抗拉强度可达1375MPa左右，在晶粒尺寸为30~50µm级别的奥氏体不锈钢，且钢材不存在大量液析的AlN、MnS、VC、Cr7C3，在晶界处无大量析出的Cr23C6，无微观、宏观裂纹出现，钢材由纯FCC奥氏体组成。
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