Method for using double-layer continuous casting pouring box covering agent

Abstract

The invention relates to an application method of a double-layer continuous casting tundish covering agent, which belongs to the technical field of the continuous casting. The invention relates to a comprehensive using method of two covering agents when the low carbon and ultra-low carbon steel grades which have high requirements on the steel cleanliness are casted, bottom slag begins to be added after a large ladle is casted and is sufficiently added after the liquid lever of molten steel is positioned, and five minutes later, top slag is added at the temperature measuring and sampling location according to proportions; the percentages by weight between the bottom slag and the top slag are that: the top slag is 75-85 percent and the bottom slag is 15-25 percent. The invention has the advantages that the bottom slag keeps the characteristic that the high-basicity covering agent has strong absorbing and intermingling capability, at the same time, the second oxidation of the molten steel can be prevented and the carbolic content in the molten steel can be reduced; the top slag can cover the molten steel by taking a loose and porous shape, the incrusting phenomenon of the covering agent at the temperature measuring and sampling location can be improved obviously, the normal temperature measuring and sampling can be carried out and the invalidation loss caused by the incrusting of a temperature measuring head and a sampler can be reduced; the operation is simple, the covering agent of the common steel grades can be used as the bottom slag and the shell-broken operation is not carried out any more; the operational condition pollution caused by carbonizing rice huskes can be avoided.

Description

technical field [0001] The invention relates to the technical field of continuous casting, and in particular provides a method for applying a double-layer continuous casting tundish covering agent, which is a new technology for optimizing the performance of the continuous casting tundish covering agent. Background technique [0002] The tundish covering agent has metallurgical functions such as heat preservation, preventing secondary oxidation of molten steel, absorbing floating inclusions, and stabilizing the liquid level of molten steel. For low-carbon steel, ultra-low carbon steel and other steel grades that require high cleanliness of molten steel, in addition to emphasizing the function of absorbing inclusions, it is also required to prevent molten steel from increasing carbon. [0003] At present, many steel mills use high-alkalinity carbon-free covering agent to improve the ability of the covering agent to absorb inclusions and prevent carburization of molten steel [1...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for applying a double-layer continuous casting tundish covering agent, which solves the problems that the residue is not easily broken and removed, difficult to disassemble, the service life of the lining is reduced, and the molten slag in the tundish has poor ability to absorb inclusions, etc., and, Optimized the operating environment