Converter steel-smelting technique

A converter steelmaking and new process technology, applied in the field of metallurgy, can solve problems such as unsatisfactory stirring effect and waste

Inactive Publication Date: 2008-04-30
孙中强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 en...

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0004] The present invention carries out experiment on 150 tons of steel ladles of B steel factory, and the production steel type is ST12 low carbon steel, and tapping temperature (in the ladle) 1665~1675 ℃, in molten steel (O) 600~700ppm, (S) 350~300ppm, Steel slag is used to mix out, and slag is removed after tapping, and 250-300kg of calcium metaaluminate and 200-220kg of lime are added to re-slag. After slagging, spray 150kg of aluminum powder for deoxidation and alloying, and finally spray 300kg of [Ca+12CaO·7Al 2 o 3 ], where Ca: 12CaO·7Al 2 o 3 =1:4, further deoxidation, desulfurization, slag washing. A total of 75 furnaces were counted, and the ladle sampling analysis averaged 〔O〕9.6ppm and 〔S〕165ppm. The results showed that the oxygen and sulfur contents in the steel were better than the traditional LF furnace refining process.

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/00C21C7/06
Inventor 孙中强
Owner 孙中强
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