Mold flux for continuous casting of large-strand ultra-high carbon wear-resistant ball steel and preparation method therefor

By preparing a protective slag with a specific composition, the problem of weak inclusion absorption capacity of existing protective slags is solved, thereby improving the quality of cast billets and production efficiency. It is suitable for continuous casting production of large square billets of ultra-high carbon wear-resistant spherical steel.

WO2026138396A1PCT designated stage Publication Date: 2026-07-02CHANGSHU LONGTENG SPECIAL STEEL CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
CHANGSHU LONGTENG SPECIAL STEEL CO LTD
Filing Date
2025-12-02
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing protective slags have high melting points, high viscosity, and low basicity, resulting in a weak ability to absorb inclusions floating in molten steel. This leads to frequent surface cracks and steel leakage accidents on the billet, affecting billet quality and production efficiency.

Method used

Using a specific ratio of wollastonite powder, fused premelted material, lithium metaborate, borosilicate glass, sodium fluoride, barium fluoride, fluorite powder, electrode graphite, high-carbon earthy graphite, N660 carbon black, and dextrin as raw materials, a protective slag for continuous casting of large square billets of ultra-high carbon wear-resistant spherical steel is prepared through processes such as preparing a mixed slurry and spray granulation, while controlling its basicity, melting point, and viscosity.

Benefits of technology

It improves billet lubrication, enhances the ability to absorb inclusions floating in molten steel, reduces the incidence of surface cracks and steel leakage on billets, improves the surface and subsurface quality of billets, and enhances continuous casting production efficiency.

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Abstract

A mold flux for the continuous casting of large-strand ultra-high carbon wear-resistant ball steel and a preparation method therefor. ‌The mold flux is prepared from the following raw materials in parts by weight: 15-28 parts of wollastonite powder, 20-40 parts of an electrically fused pre-melted slag, 3-6 parts of lithium metaborate, 2-8 parts of borosilicate glass, 2-4 parts of sodium fluoride, 5-13 parts of sodium carbonate, 2-7 parts of barium fluoride, 7-11 parts of fluorite powder, 2-5 parts of electrode graphite, 2-5 parts of high-carbon amorphous graphite, 2-4 parts of N660 carbon black and 2-4 parts of dextrin. The mold flux has a relatively low viscosity, a relatively low melting point and a relatively high basicity, improves the lubrication effect on a casting blank, enhances the ability to absorb floating inclusions in the molten steel, reduces the incidence of cracks on the casting blank surface and the occurrence of breakouts, improves the surface and subsurface quality of the casting blank, and increases the production efficiency of continuous casting. The mold flux is particularly suitable for the continuous casting production of large-strand ultra-high carbon wear-resistant ball steel.
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