Ultra-pure smelting method for high-performance Cr-Ni-W shaft steel and high-performance Cr-Ni-W shaft steel

Through the dual smelting process of vacuum induction melting and vacuum consumable remelting, the problems of insufficient purity and inclusion levels of Cr-Ni-W series high-strength steels were solved, and the preparation of high-performance Cr-Ni-W series high-strength steels was achieved to meet the material requirements of high-end marine equipment.

CN120666238APending Publication Date: 2025-09-19宝武特种冶金有限公司
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Patent Information

Application Number
CN202410313276.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-03-19
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

The existing Cr-Ni-W series high-strength steel smelting process is difficult to achieve ultra-high purity and ultra-low inclusion levels, and cannot meet the requirements of high-end marine equipment for high-performance materials.

Method used

The dual smelting process of vacuum induction melting and vacuum consumable remelting is adopted, combined with high-purity raw materials, strict charging sequence and vacuum degree control. The current and voltage control in the vacuum consumable remelting stage is used to ensure the uniformity of alloy composition and structure, and further remove gas and inclusions.

Benefits of technology

The tensile strength, yield strength, elongation and V-notch impact energy of the Cr-Ni-W series high-strength steel have been significantly improved, and the overall performance of the material has been enhanced to meet the high performance requirements of high-end marine equipment.

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Abstract

The invention belongs to the field of ultra-pure smelting processes of high-performance Cr-Ni-W series high-strength steel, and particularly relates to an ultra-pure smelting method of high-performance Cr-Ni-W shaft steel and the high-performance Cr-Ni-W shaft steel. According to the method, vacuum induction melting is adopted, furnace charge is heated and melted in a magnetic induction mode, the whole melting process is completed in vacuum, and no slag participates in the metallurgy process. The smelting mode has a good effect of removing gas and non-ferrous metal impurities, and alloy elements are basically not burnt. In the vacuum consumable remelting process, inclusion particles float to the surface of a molten pool and are gradually adsorbed by the wall of a crucible under the action of an electric arc, so that the inclusion content in the alloy can be further reduced, and the purity of a cast ingot is improved; and meanwhile, reasonable cooperation of current and voltage, melting speed and cooling is adopted in the melting process, and the component and structure uniformity of Cr-Ni-W series high-strength steel finished product cast ingots is guaranteed.
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