Converter steel-smelting technique

Abstract

The invention relates to a new technology for revolving furnace steel making. The technology comprises the smelting steps in a converter, and the invention is characterized in that steel and steel slag are discharged in a mixed way when the steel is discharged from the converter, liquid steel is discharged completely, the slag removal is performed after the liquid steel is poured into a steel ladle, harmful foreign impurities such as phosphorus and silicon can be effectively removed, the slag is rebuilt after the slag removal, and aluminum powder spraying is adopted to perform deoxygenation. The invention can simplify the original technological process, save the productive time, reduce the production energy consumption and the material consumption, and enhance the production efficiency of steel and iron smelting. The technology is in particular suitable for the smelting of low silicon and low phosphorus steel type.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a novel process of converter steelmaking. Background technique [0002] At present, in the production process of converter smelting, after the molten steel is smelted in the converter, the slag is blocked and the steel is tapped, the aluminum alloy deoxidizer is pre-added in the ladle for deoxidation, and the alloy is added for initial alloying. These alloys are mixed and stirred by utilizing the kinetic energy of molten steel tapping. The main disadvantage of this process is that slag entrainment is inevitable during the tapping process, and the slag contains a large amount of harmful impurities such as phosphorus and silicon, which brings endless troubles to subsequent refining. Although metallurgists have developed a large number of deoxidizers, because the density of various deoxidizers is smaller than that of molten steel, they will soon float to the surface of molten steel...

AI Technical Summary

Problems solved by technology

Due to the need for steel types, many iron and steel enterprises have to keep steel for operation in order to reduce slag, resulting in serious waste

However, using the kinetic energy of molten steel to stir the deoxidizer and alloy is only good in the early stage, but the stirring effect is not ideal in the later stage due to the rise of the liquid steel level.