Calcium deoxidizer able to optimize molten steel viscosity and preparation method thereof

Abstract

The invention discloses a calcium deoxidizer able to optimize molten steel viscosity. The calcium deoxidizer is characterized by being prepared from the following raw materials by weight part: 34-37 of calcium silicide, 13-18 of silicon carbide, 5-7 of barium carbonate, 42-50 of 5% acetic acid, 3.5-5 of pregelatinized starch, 2-3 of montmorillonite, and 1.5-2 of lignin. The process involved in the invention is scientific and reasonable, the calcium deoxidizer is made into porous particles, is easy to form negative pressure, and can fully react with oxygen in molten steel. By adding montmorillonite, the calcium deoxidizer has good dispersibility, improves the viscosity of molten steel, thereby improving molten steel fluidity, effectively removing inclusions in steel, enhancing molten steel purity, and preventing tundish nozzle clogging. The steel made by the calcium deoxidizer provided by the invention has mechanical properties like yield strength and tensile strength increased by certain extent, the calcium deoxidizer is feasible in production, and can achieve good economic benefits.

Description

technical field [0001] The invention relates to the technical field of deoxidizers for steelmaking, in particular to a calcium-based deoxidizer for optimizing the viscosity of molten steel and a preparation method thereof. Background technique [0002] With the development of science and technology, there is more and more demand for steel in industry and daily life, and the quality requirements for steel are also getting higher and higher. The quality of steel is developing in the direction of purification and ultra-purification, requiring secondary elements The control of the content is becoming more and more strict, which will inevitably put forward higher requirements on the quality of raw materials such as deoxidizers for iron and steel. [0003] In the use of molten steel final deoxidizer, it has experienced the processes of silicon aluminum iron, silicon aluminum barium and silicon aluminum barium calcium. Usually silicon aluminum barium is used as the final deoxidize...

AI Technical Summary

Problems solved by technology

This deoxidation and alloying method is affected by the end point C of molten steel, the tapping temperature and the amount of slag, resulting in large fluctuations in the composition of Mn in the steel and unstable recovery rates of alloying elements.

And when the amount of deoxidizer added is too large, the acid-soluble aluminum in molten steel exceeds a certain level, which will lead to the formation of solid Al 2 o 3 Clustered inclusions, the viscosity of molten steel increases, the inclusions increase and are not easy to float up and get rid of, eventually leading to nodules at the tundish nozzle

[0004] The deoxidizing agent in the prior art has deoxidizing effects that need to be improved, the viscosity of molten steel is too high, and the increase of inclusions is difficult to float up and get rid of, resulting in nodules at the water-filled mouth, etc.