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Method for reducing deoxidized aluminum-ferro consumption in steel tapping process of aluminum killed steel converter

A technology of tapping process and aluminum-killed steel, which is applied in the field of metallurgy, can solve the problems of high consumption of deoxidized alloy aluminum and iron, high production cost, and unavoidable slag, so as to save costs, reduce the amount of slag, and reduce consumption Effect

Inactive Publication Date: 2016-01-27
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Since the slag is unavoidable during the tapping process of the converter, when the oxygen activity of the molten steel at the end of the converter is constant, the more the amount of slag is dropped, the more the oxides in the slag will consume the more deoxidized alloy aluminum and iron, resulting in the deoxidized alloy during the tapping process. The consumption of aluminum and iron is higher, and the production cost is higher

Method used

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  • Method for reducing deoxidized aluminum-ferro consumption in steel tapping process of aluminum killed steel converter
  • Method for reducing deoxidized aluminum-ferro consumption in steel tapping process of aluminum killed steel converter
  • Method for reducing deoxidized aluminum-ferro consumption in steel tapping process of aluminum killed steel converter

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Embodiment 1

[0066] A 200t converter in a factory uses semi-steel for steelmaking. The carbon content of the semi-steel into the furnace is 3.5%, and the temperature is 1274°C. After adding iron, smelting begins. At this moment, the carbon content of the end-point molten steel is 0.05%, and the oxygen content is 560ppm. After adopting the method provided by the present invention, the average value of the slag volume in the converter is 1183.75kg / furnace, the slag volume per ton of steel is 4.93kg, and the slag thickness is 30.43mm; the tapping process Add aluminum and iron 119kg.

Embodiment 2

[0070] A 200t converter in a factory uses semi-steel for steelmaking. The carbon content of the semi-steel into the furnace is 3.7%, and the temperature is 1274°C. After adding iron, smelting begins. At this time, the carbon content of the end point molten steel is 0.055%, and the oxygen content is 500ppm. After adopting the method provided by the present invention, the average amount of slag dropped by the converter is 1195.75kg / furnace, the amount of slag dropped per ton of steel is 4.99kg, the slag thickness is 31.43mm, and 385kg of aluminum and iron are added in the tapping process.

Embodiment 3

[0074] A 200t converter in a factory uses semi-steel for steelmaking. The carbon content of the semi-steel into the furnace is 3.5%, and the temperature is 1294°C. After adding iron, smelting begins. At this time, the carbon content of the end point molten steel is 0.06%, and the oxygen content is 460ppm. After adopting the method provided by the present invention, the average amount of slag dropped by the converter is 1185.75kg / furnace, the amount of slag dropped per ton of steel is 4.95kg, the slag thickness is 30.53mm, and 149kg of aluminum and iron are added in the tapping process.

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Abstract

The invention discloses a method for reducing deoxidized aluminum-ferro consumption in the steel tapping process of an aluminum killed steel converter. By the adoption of the method, the slag amount can be reduced and accordingly aluminum-ferro consumption is reduced. The method includes the steps that A, a gate valve is arranged on a steel outlet of the converter; B, during smelting of the converter, the gate is controlled so that the steel outlet can be in an open state; C, when smelting of the converter is completed, the gate valve is controlled so that in the tilting process of the converter, the steel outlet can be in a closed state before molten steel in the converter immerses the steel outlet; D, when the converter tilts till the molten steel in the converter immerses the steel outlet, the gate valve is controlled to be opened, and the converter tilts till the steel outlet is vertically downwards; E, when an AMEPA system of the steel outlet detects slag, the gate valve is controlled to be closed; and F, the converter is controlled to tilt to a vertical position in the direction opposite to the tilting direction in the step C, and the gate valve is controlled to be opened. By means of the method, the slag amount can be reduced, aluminum-ferro consumption is reduced, and cost is reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a method for reducing the consumption of deoxidized aluminum and iron in the tapping process of an aluminum-killed steel converter. Background technique [0002] Known: Due to the characteristics of aluminum-killed steel itself, when smelting molten steel, not only need to use a large amount of aluminum-based deoxidizer to deoxidize the molten steel, but also require a certain amount of acid-soluble aluminum in the steel, because the price of aluminum-based deoxidizer is very high Once the control is not good, the consumption of aluminum-based deoxidizer will be too high and the smelting cost will increase significantly. At the same time, the Al2O3 inclusions produced by aluminum deoxidation will seriously pollute the molten steel. Even after LF treatment, it will still cause The increased content of inclusions in the steel will cause steel pouring accidents, which will seriously affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28
Inventor 陈路曾建华陈均梁新腾张彦恒黄德胜
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP