具有良好冲击韧性的马氏体不锈钢及其制造方法

By adding rare earth elements Y and Ti to martensitic stainless steel, optimizing the smelting and rolling process, refining the grains and uniformly distributing TiC and M23C6, and combining this with high-temperature tempering treatment, the problem of insufficient impact toughness in martensitic stainless steel was solved, achieving a balance between high strength and high toughness.

CN117867383BActive Publication Date: 2026-07-17ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANGANG STEEL CO LTD
Filing Date
2023-12-25
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The existing martensitic stainless steels have insufficient impact toughness, especially the medium and high carbon varieties, which limits their application in fields that bear large impact loads. Existing technologies have increased the cost of alloys by adding precious metal elements Ni and Mo, but the effect is not significant.

Method used

By adding rare earth elements Y and Ti, combined with rolling process design and the composite effect of Y-Ti-C elements, the grains are refined, the formation of alloy carbides M23C6 is reduced, the smelting and continuous casting process is optimized to reduce inclusions and element segregation, and high-temperature tempering treatment is used to obtain tempered sorbite structure, thereby improving the impact toughness of the steel.

Benefits of technology

It significantly improves the impact toughness of martensitic stainless steel, achieving an impact energy of 215J at room temperature and 116J at 0℃, while maintaining high strength and uniform hardness to meet the application requirements of large impact loads.

✦ Generated by Eureka AI based on patent content.

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Abstract

本发明提出一种具有良好冲击韧性的马氏体不锈钢，钢的化学成分按重量百分比计，包含：0.30～0.45％的C；0.2～0.5％的Si；0.5～1.0％的Mn；≤0.030％的P；≤0.005％的S；9.5～11.5％的Cr；0.10～0.20％的Y；0.12％～0.30％的Ti；(Y+Ti) / C：0.75～1.2，余量为Fe和不可避免的杂质。钢板的生产方法包括冶炼、连铸、加热、轧制、热处理。本发明通过添加稀土元素Y、Ti结合轧制工艺设计以及Y‑Ti‑C元素的复合作用，细化晶粒，减少合金碳化物M23C6生成，促进TiC、M23C6在基体中的均匀分布，通过冶炼连铸工艺优化，减少钢中夹杂物，降低元素偏析水平，提高冲击韧性。钢板的屈服强度Rp0.2≥986MPa，抗拉强度Rm≥1232MPa，延伸率A≥18.2％，室温冲击功AKV≥215J，0℃冲击功AKV≥116J，硬度均匀性≤3HRC。
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Citation Information

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