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A method for washing converter steel using low al alumina ball slag

A technology of alumina balls and alumina, applied in the field of slag washing using low Al alumina balls in converter tapping, can solve the problems of corrosion of refractory materials, poor slag washing conditions, high cost, etc., achieve low melting point, large amount of slag, and improve Effect of slag condition

Active Publication Date: 2017-12-15
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for washing converter steel using low-Al alumina ball slag, which solves the problems of poor washing conditions, high cost, and corrosion of refractory materials in the original slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] xxxQ00162 heat, aluminum-free steel type A ship plate steel, the process route adopted is: converter smelting - slag washing - ladle furnace refining - slab continuous casting.

[0024] Converter smelting: Converter end point carbon content [C] = 0.125%, end point sulfur content [S] = 0.0137%, end point temperature T = 1655°C; tapping adopts weak deoxidation and slag blocking operations.

[0025] Slag washing: when the tapping amount reaches 30% of the total amount, add lime 5.06kg / t steel and low Al alumina ball 1.5kg / t steel.

[0026] Refining in ladle furnace: blowing argon on the ladle at the refining station for 3 minutes, and the flow rate of argon gas is 800NL / min. The temperature is measured at 1567°C, and it enters the heating position for treatment, using the 9 / 1 gear to melt the slag for 1 minute. Turn to 3 / 4 gear and heat up for 15 minutes. During the process, 214kg of lime and 25kg of fluorite were added.

[0027] In terms of overall effect, the cost is ...

Embodiment 2

[0029] xxxN00107 heat, aluminum-containing plain carbon steel B-S, the process route adopted is: converter smelting - slag washing - ladle furnace refining - slab continuous casting.

[0030] Converter smelting: Converter end point carbon content [C] = 0.112wt%, end point sulfur content [S] = 0.0225%, end point temperature T = 1652°C; tapping adopts weak deoxidation and slag blocking operations.

[0031] Slag washing: when the amount of steel tapping reaches one-third of the total, add lime 4.82kg / t steel and low Al alumina ball 2.00kg / t steel.

[0032] Refining in ladle furnace: blowing argon on the ladle at the refining station for 3 minutes, and the flow rate of argon gas is 800NL / min. Measure the temperature at 1558°C, use the 9 / 1 gear to melt the slag for 1 minute, turn to the 6 / 1 gear to melt the slag for 2 minutes, and then turn to the 3 / 4 gear (voltage value 169v) to raise the temperature for 10 minutes. Add lime 5.56kg / t steel, aluminum particles 45kg / t steel, alumin...

Embodiment 3

[0035] xxx Q00112 heat, aluminum-containing low-sulfur steel S355G8+M, the process route adopted is: converter smelting - slag washing - ladle furnace refining - RH vacuum refining - slab continuous casting.

[0036] Converter smelting: Converter end point carbon content [C] = 0.039%, end point sulfur content [S] = 0.0226%, end point temperature T = 1667°C; tapping adopts strong deoxidation and slag blocking operations.

[0037] Slag washing: when the tapping amount reaches one-third of the total amount, add lime 4.12kg / t steel and low Al alumina ball 2.00kg / t steel. Aluminum and iron 4.70kg / t steel.

[0038] Refining in ladle furnace: blowing argon on the ladle at the refining station for 3 minutes, and the flow rate of argon gas is 800NL / min. The temperature was measured at 1555°C. Adjust slag remover and aluminum pellets. Fluorite 0.60-1.00kg / t steel. Enter the heating position treatment, use 9 / 1 gear for 2 minutes, turn to 6 / 1 gear for 2 minutes (voltage value 146v), t...

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Abstract

The invention discloses a method for washing converter steel tapping with low-Al alumina ball slag, which belongs to the technical field of converter steel tapping slag washing technology. During the tapping process, the ladle bottom blowing argon system is opened, and the argon flow rate is controlled at 300-1200NL / min; when the tapping amount reaches 25%-35% of the total amount, white ash and low Al alumina balls are added; refining to At the station, according to the composition requirements of different steel types, the temperature of the molten steel at the station, and the conditions of the slag, the slag and deoxidizer are adjusted, and then the temperature is raised and the subsequent molten steel treatment is carried out. The advantage is that by using the slag washing form of lime and low Al alumina balls, it can meet the requirements of lowering the melting point of slag at the refining station, improving the fluidity of slag, increasing the speed of slagging, shortening the time of slagging, improving the adsorption capacity of slag inclusions and reducing the comprehensive Slagging cost.

Description

technical field [0001] The invention belongs to the technical field of converter tapping slag washing technology, and in particular relates to a method for washing converter tapping with low Al alumina ball slag. Especially for lowering the melting point of converter slag washing system, improving the conditions of slag at the refining station, shortening the time of refining slag, improving the adsorption capacity of inclusions, and reducing the overall cost, it has a great improvement effect. Background technique [0002] As the steel market continues to weaken, reducing production costs and improving product quality has become the top priority for major steel companies. As an out-of-furnace treatment method, slag washing has the characteristics of low cost and fast slag formation. It is a simple and effective means to quickly obtain ladle refining slag, and can effectively remove inclusions and purify molten steel. The basic process method is to add slag washing material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/10C21C5/28
Inventor 王国连蒋海涛郑展祥秦登平史志强刘金刚李战军初仁生王星王志刚杨荣光王宏宇
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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