High-cobalt stainless powder metallurgy high-speed steel and preparation method and application thereof

By developing a method for preparing high-cobalt stainless powder metallurgy high-speed steel, the problem of balancing hardness, wear resistance, and corrosion resistance in existing materials has been solved. This method achieves the required corrosion resistance and strength for high-performance cutting tools, making it suitable for high-end cutting tool applications such as military daggers and dental drills.

CN121006494APending Publication Date: 2025-11-25CHANGSHA SHARPEN ADVANCED MATERIALS CO LTD
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Patent Information

Application Number
CN202511190643.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-25
Publication Date
2025-11-25

AI Technical Summary

Technical Problem

Existing stainless steel and high-speed steel materials are difficult to balance between hardness, wear resistance and corrosion resistance. In particular, when used in high humidity environments, problems such as passivation film failure, blade cracking and surface pitting occur. Moreover, high-end imported powder metallurgy high-speed steel materials have complex compositions and high costs, making it difficult to replace them with domestically on a large scale.

Method used

High-cobalt stainless powder metallurgy high-speed steel is adopted. Based on Fe-Cr-C, a high content of Co element is added, combined with B and La elements, and segmented solid solution heat treatment is carried out to optimize the material microstructure, improve the solid solubility of Cr and corrosion resistance, and promote sintering densification and grain refinement through LaB6 powder.

Benefits of technology

It achieves high hardness (HRC 67~69), excellent corrosion resistance (salt spray corrosion resistance life of more than 290 hours) and good wear resistance, making it suitable for high-end cutting tools in highly corrosive environments, reducing manufacturing costs and improving the controllability and adaptability of materials.

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Abstract

The invention discloses high-cobalt stainless powder metallurgy high-speed steel and a preparation method and application thereof.The high-cobalt stainless powder metallurgy high-speed steel comprises, by mass, 15%-25% of Cr, 1.4%-1.6% of C, 5%-10% of Co, 0.05%-0.10% of B, 0.1%-0.3% of La and the balance Fe and inevitable impurities, the B and the La are preferably added in the form of lanthanum hexaboride (LaB), and the high-cobalt stainless powder metallurgy high-speed steel is prepared through ball milling, cold pressing, vacuum sintering and multi-section heat treatment processes. The alloy has the advantages of compact structure, fine carbide, pure grain boundary, high hardness of HRC 67-69, salt mist corrosion resistance of more than or equal to 290 hours and excellent wear resistance, and is suitable for manufacturing high-end cutting tools in complex corrosive environments, such as military daggers, dental drill bits, medical cutting instruments, stirring and crushing knives and the like.
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