一种高强塑性高低温韧性马氏体不锈钢及其制造方法

By adding Te to martensitic stainless steel and combining it with specific rolling and heat treatment processes, the problems of insufficient strength, plasticity and low-temperature toughness were solved, achieving excellent performance in both high strength and low-temperature environments.

CN117867386BActive 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

Existing technologies have failed to effectively address the issue of matching strength, plasticity, and low-temperature toughness in martensitic stainless steel, particularly its insufficient toughness under high-strength and low-temperature conditions.

Method used

By adding the quasi-metallic element Te, the spheroidization rate of non-metallic inclusions is improved. Combined with the design of rolling and heat treatment processes, the austenite grains are refined, the formation of large-angle grain boundaries and ordered superstructures are promoted, and the low-temperature toughness of steel is improved.

Benefits of technology

A martensitic stainless steel with high strength, plasticity and high and low temperature toughness was achieved, with yield strength Rp0.2≥760MPa, tensile strength Rm≥1140MPa, yield ratio≤0.70, elongation A≥24.6%, reduction of area Z≥71%, and impact energy Akv≥95J at -60℃.

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Abstract

本发明公开了一种高强塑性高低温韧性马氏体不锈钢及其制造方法，钢的化学成分包含：0.06％～0.15％的C；≤0.5％的Si；1.85％～2.30％的Mn；≤0.025％的P；≤0.005％的S；10.0％～12.5％的Cr；0.01％～0.03％的Te。生产工艺包括：冶炼、连铸、加热、轧制、热处理。本发明通过添加准金属元素Te，提高非金属夹杂球化率至≥96％，改善钢的强塑性，同时，结合轧制与热处理工艺设计，一方面细化原始奥氏体晶粒度≥10级，促进具有阻止裂纹扩展作用的大角度晶界形成，另一方面促进Te在晶界偏聚，诱导大角度晶界重构，形成长程有序超结构，提高大角度晶界低温稳定性，从而提高钢的低温韧性。
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