一种细化高速工具钢碳化物尺寸的电渣重熔渣系及工艺

CN122147074BActive Publication Date: 2026-07-17INNER MONGOLIA UNIV OF SCI & TECH +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INNER MONGOLIA UNIV OF SCI & TECH
Filing Date
2026-05-09
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In the existing electroslag remelting process, rare earth and magnesium elements are severely burned off under high-temperature oxidizing atmosphere, resulting in large carbide size in high-speed tool steel, which affects mechanical properties and service life.

Method used

By optimizing the slag composition, controlling the content of RE2O3 and MgO, and adding rare earth magnesium to treat the electrode, a rare earth enrichment layer is formed to inhibit the oxidation and burn-off of rare earth and magnesium. In addition, with appropriate CaF2, Al2O3 and SiO2 content, the carbide size is refined.

Benefits of technology

It significantly improves the yield of rare earth elements and magnesium, inhibits the growth of carbides in high-speed steel, and enhances hardness, toughness, and wear resistance, thus meeting the high-quality requirements of high-speed steel.

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Abstract

本发明提供一种细化高速工具钢碳化物尺寸的电渣重熔渣系及工艺，所述电渣重熔的自耗电极制备时经稀土镁处理，按质量百分比计，所述渣系包括如下组分，CaF2：40%～50%；CaO：10%～15%；Al2O3：10%～15%；MgO：8%～12%；RE2O3：15%～20%；SiO2：0.5%～1.0%；余量为不可避免杂质，杂质含量不大于1%。本发明通过控制渣系中RE2O3和MgO含量，优化CaF2、Al2O3和SiO2等关键组元含量，有效抑制电渣重熔过程中稀土和镁的烧损，利用稀土和镁抑制高速钢凝固过程一次碳化物和热处理过程二次碳化物的长大，从而细化高速钢钢锭和钢材的碳化物尺寸，显著提升高速钢的硬度、韧性和耐磨性。
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