Double-layer tundish covering agent

Abstract

The invention relates to a double-layer middle coating agent which belongs to the field of metallurgy. The invention solves the technical problem of providing a double-layer middle coating agent capable of preventing crusting on a slag surface. The double-layer middle coating agent comprises an upper layer of slag materials and a lower layer of slag materials; wherein, the components of the lower layer of slag materials thereof comprise 40 to 60 weight portions of CaO, 20 to 40 weight portions of Al2O3, as well as 5 to 7 weight portions of CaF2; moreover, the weight ratio between CaO and Al2O3 is 1 to 3. The double-layer middle coating agent not only can prevent crusting on the slag surface, but also has stronger capacity for absorbing impurities and excellent heat preservation function; moreover, the double-layer middle coating agent can reduce the secondary pollution to molten steel and has broad application prospect.

Description

technical field [0001] The invention relates to a double-layer tundish covering agent and belongs to the field of metallurgy. Background technique [0002] With the maturity of the three-in-one smelting process of primary smelting, refining and continuous casting in the modern iron and steel industry, the brand-new concept of tundish metallurgy has been widely recognized by people. As one of the important components of this technology, the tundish covering agent is mainly used to cover the surface of the molten steel in the tundish during the continuous casting process. Its basic requirements are: no adverse reaction with molten steel, avoiding contamination of molten steel; Middle bag lining. Its main functions are: heat preservation of molten steel to avoid excessive temperature drop of molten steel in the tundish during pouring and cold steel on the surface of molten steel; formation of liquid slag layer covering the surface of molten steel to isolate air and prevent sec...

AI Technical Summary

Problems solved by technology

This double-layer alkaline tundish covering agent has a good thermal insulation effect and can avoid carburization of molten steel, but due to the SiO in the lower layer of slag 2 The content is too high, there is SiO in use 2 Contamination of molten steel. At the same time, the tundish covering agent with high MgO content is easy to crust on the slag surface during continuous pouring in multiple furnaces, which has a negative impact on the performance of the covering agent.

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