Mold powder for continuous casting of low nickel and high manganese stainless steel and preparation method thereof

Abstract

The invention discloses mold powder for continuous casting of low nickel and high manganese stainless steel and a preparation method thereof. The mold powder comprises the following chemical compositions in percentage by weight: 38.0 to 42.0 percent of CaO, 32.8 to 38.0 percent of SiO2, 3.6 to 5.0 percent of MnO, 2.0 to 4.0 percent of MgO, 3.0 to 4.0 percent of Al2O3, 10 to 14 percent of fluxing agent containing NaO, F and Li2O, and 1.5 to 2 percent of Fc, wherein the ratio of the Cao to the SiO2 is 1.0-1.28. The preparation method comprises that: various raw materials are mixed and pelletized; and the pellets are melted in a liner-free furnace with water-cooling wall, subjected to water quenching, drying and crushing, added with a carbon material, namely 1.5 to 2.0 percent of Fc, and then prepared into hollow spherical mold powder in a spray prilling tower. Compared with the prior art, the mold powder has the advantages of eliminating vertical cracks on the surface of a casting blank, preventing cinder inclusion on the surface of the casting blank, avoiding oscillation marks on the casting blank, reducing surface conditioning of the casting blank, and having the surface quality of a slab equal to 304 austenitic stainless steel.

Description

technical field [0001] The present invention relates to auxiliary materials for steelmaking. Especially for continuous casting mold flux for low-nickel and high-manganese stainless steel belonging to the austenitic stainless steel series. Background technique [0002] The existing mold fluxes for steelmaking and continuous casting usually contain CaO, SiO 2 、Al 2 Composed of mineral raw materials such as O3 oxides, fluxes containing elements such as Na and F are added to adjust the melting point and viscosity of the mold slag, and a certain amount of carbon material is added to control the melting speed of the mold slag on the molten steel surface of the mold. Mold slag forms slag layer, sintering layer and powder slag layer from bottom to top on the molten steel surface, which has the following functions: powder slag layer acts as heat preservation; molten slag layer can isolate air to avoid molten steel oxidation; molten slag absorbs and dissolves molten steel floating ...

AI Technical Summary

Problems solved by technology

Patent CN200410064582.6 After adopting high-basic mold flux, in order to make up for the insufficient lubrication function of the mold flux, the viscosity of the mold flux must be reduced, thereby increasing the unit consumption of the mold flux, which is unfavorable for reducing the vibration marks of the slab

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