Vanadium-niobium microalloyed steel for cutter head of shield tunneling machine and production method of vanadium-niobium microalloyed steel

Through the metallurgical process of steel for vanadium-niobium microalloyed shield machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine metallurgical process, optimize the alloy composition and heat treatment problems, and solve the problems of complex steel composition steel cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine cutting machine wearing resistance and impact resistance.

CN120290981APending Publication Date: 2025-07-11CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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Patent Information

Application Number
CN202510514791.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-23
Publication Date
2025-07-11

AI Technical Summary

Technical Problem

The steel components used in the cutting plates of the existing shield machine are complex and the heat treatment process is relatively complex, especially for tooling with larger sizes, and the existing materials are prone to cracking or plastic deformation under high impact.

Method used

The steel for the shield machine cutter plate with vanadium-niobium microalloy is adopted. Through electric furnace smelting, LF furnace smelting, VD furnace refining and electroslag remelting, combined with high temperature uniform diffusion and combined heat treatment, the alloy composition is optimized, and the trace elements niobium and vanadium are added to coordinate the refinement of the grains to form a martensite structure with high hardness, high strength and good impact toughness.

Benefits of technology

The obtained steel has good impact toughness of 20J to 25J at a high hardness of 55 to 59HRC, which significantly improves the wear resistance and impact resistance of the cutter plate, extends the service life, and reduces cracking or plastic deformation caused by impact.

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Abstract

The invention relates to vanadium-niobium microalloyed steel for a shield tunneling machine cutterhead and a production method of the vanadium-niobium microalloyed steel, and belongs to the technical field of alloy steel preparation. The steel comprises the following chemical components in percentage by weight: 0.44%-0.49% of C, 1.4%-1.6% of Mo, 1.0%-1.4% of Si, 4.8%-5.2% of Cr, 0.4%-0.6% of Mn, 1.40%-1.70% of V + Nb and the balance of Fe and inevitable impurities. The method comprises the following steps: a, electric furnace smelting; b, refining outside a furnace; c, carrying out electroslag remelting to obtain a steel ingot; d, the steel ingot is subjected to element high-temperature uniform diffusion treatment; and e, combined modulation heat treatment. By optimizing alloy components, microelements niobium and vanadium are introduced to synergistically refine grains, and the high toughness index is shown after heat treatment. The problems that existing steel for the shield tunneling machine cutterhead is different in component, the heat treatment technology is complex, salt bath quenching and partitioning technologies are needed, and the technology for large-size cutters is difficult are solved.
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