Crystallizer casting powder for continuous casting of high-carbon abrasion-resisting steel

Abstract

The invention relates to crystallizer casting powder for continuous casting of high-carbon abrasion-resisting steel. The crystallizer casting powder comprises, by weight percent, 7.5%-33.5% of CaO2, 27%-34% of SiO2, 2%-7% of Al2O3+MgO, smaller than 5% of Fe2O3, 2%-8% of F, 4.5%-10.5% of R2O, 3.5%-9.5% of C, 0.8%-1.3% of CaO/SiO2, and the balance impurities. Except C, calculating and burdening are conducted according to the above components, then the components are evenly mixed, pelletizing is conducted, and the components are fed into an electric furnace to be evenly melted; and after cooling crushing, the components are screened, a corresponding carbon framework material is added, then ball milling and slurrying are conducted, and finally, finished casting powder is obtained through atomizing, granulating and drying. The alkalinity of the casting powder is low and ranges from 0.8 to 1.3, and the casting powder is stable in performance in the using process. In the continuous casting process of high-carbon abrasion-resisting steel, the casting powder can effectively control and balance heat transfer of a primary blank shell in a meniscus region to the crystallizer wall through a slag film, and the probability of recessing, longitudinal splitting and other surface defects of a cast blank can be effectively lowered; and meanwhile lubrication of a liquid slag film to the primary blank shell can be guaranteed, bonding and bonding bleed-out are avoided, stable and smooth continuous casting is facilitated, and the continuous casting efficiency is improved.

Description

technical field [0001] The invention relates to mold powder for continuous casting, in particular to a mold powder for continuous casting of high-carbon wear-resistant steel slabs, which is suitable for bonding steel types where the depressions produced by the reaction of high-carbon wear-resistant steel are prone to cracks during solidification The high-speed slab continuous casting production belongs to the technical field of continuous casting production. Background technique [0002] In the continuous casting production process of high-carbon wear-resistant steel slabs, the liquidus temperature of high-carbon wear-resistant steel is low, and the temperature difference between the two phases is large, so that the stable slab shell ratio formed by high-carbon wear-resistant steel during solidification is low. Carbon steel should be thinner; at the same time, the solidification structure and microsegregation will affect the high-temperature mechanical properties of the stee...

AI Technical Summary

Problems solved by technology

Therefore, there is a big difference between the physical and chemical properties of mold flux and traditional continuous casting mold flux