A heating-type casting slag for continuous casting of rectangular billets

Abstract

The invention provides a heating start powder for continuous casting of a rectangular billet and belongs to the technical field of steel-making auxiliary materials. According to the technical scheme, the heating start powder for continuous casting of the rectangular billet is made of wollastonite which is smaller than or equal to 45mum in grain diameter, coke which is smaller than or equal to 50mum in grain diameter, sodium carbonate, lithium carbonate, aluminum powder which is smaller than or equal to 75mum in grain diameter and expanded graphite which is smaller than or equal to 300mum in grain diameter. By means of the heating start powder for continuous casting of the rectangular billet, fast slag forming can be achieved, good thermal insulation property and high heating rate are achieved, defects such as concaving and scarring of head slabs can be effectively prevented, cold steel can be prevented from being formed on a liquid steel surface of a crystallizer, stable, continuous and good lubrication effects can be provided for start of continuous casting of the rectangular billet, and the qualified rate of casting blanks is effectively increased.

Description

technical field

[0001] The invention belongs to the technical field of steelmaking auxiliary materials, and in particular relates to a heating type casting slag for continuous casting of rectangular billets. Background technique

[0002] At present, although China's steel production and consumption have maintained a growth trend, the growth rate has slowed down, and the steel production capacity is severely oversupplied; the price of raw materials and fuels is running at a high level, coupled with the impact of the global economic situation, the benefits of the steel industry have been greatly reduced. Various steel mills have responded to the sluggish market situation by saving energy and reducing consumption and improving product quality.

[0003] When continuous casting of rectangular billets, especially large cross-section rectangular billets, the casting speed is kept at a low casting speed for a long period of time. The first billet was cut off and returned to the fur...