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Ultra-low-carbon steel slag modifier and addition method thereof

A technology of ultra-low carbon steel and modifier, applied in the manufacture of converters, etc., can solve the problems of inability to remove FeO, increase of slag, temperature loss, etc., to reduce secondary oxidation and pollution, reduce oxidation, and reduce turbulence The effect of flow

Inactive Publication Date: 2011-06-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is a problem: the added lime only dilutes the steel slag, although it reduces the concentration of FeO, it cannot remove the FeO in molten steel; if you want to reduce FeO more, you need to add more lime, which will increase the amount of slag. and cause temperature loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] With a 60t converter, the amount of slag on the top of the molten steel tank is about 3t.

[0016] Steel slag modifier preparation:

[0017] First, prepare passivated aluminum powder with Al≥96%, containing Al 2 o 3 ≥ 40% bauxite and active lime containing CaO ≥ 91% dry powder;

[0018] Then, according to the percentage by weight: 11% of passivated aluminum powder, 39% of bauxite, and 50% of active lime, the dry powders of the three raw materials are evenly mixed to prepare the steel slag modifier of the present invention.

[0019] Steel slag modifier added:

[0020] After the RH treatment of the molten steel is completed, the steel slag modifier prepared above is added to the molten steel according to the ratio of the amount of slag at the top of the molten steel tank / modifier=4, that is, 750kg of the steel slag modifier is added to the molten steel;

[0021] After the steel slag modifier is added, press 10Nm to the molten steel in the molten steel tank 3 The amou...

Embodiment 2

[0024] With a 60t converter, the amount of slag on the top of the molten steel tank is about 3t.

[0025] Steel slag modifier preparation:

[0026] First, prepare passivated aluminum powder with Al≥96%, containing Al 2 o 3 ≥ 40% bauxite and active lime containing CaO ≥ 91% dry powder;

[0027] Then, according to the percentage by weight: 15% of passivated aluminum powder, 40% of bauxite, and 45% of active lime, the dry powders of the three raw materials are evenly mixed to prepare the steel slag modifier of the present invention.

[0028] Modifier added:

[0029] After RH finishes treating molten steel, add 1000kg of the steel slag modifier prepared above into molten steel;

[0030] After the steel slag modifier is added, press 15Nm to the molten steel in the molten steel tank 3 The amount of argon gas per hour was used for weak argon stirring for 8 min.

[0031] All the rest are carried out according to the conventional process.

Embodiment 3

[0033] With a 60t converter, the amount of slag on the top of the molten steel tank is about 3t.

[0034] Steel slag modifier preparation:

[0035] First, prepare passivated aluminum powder with Al≥96%, containing Al 2 o 3 ≥ 40% bauxite and active lime containing CaO ≥ 91% dry powder;

[0036] Then, according to the percentage by weight: 17% of passivated aluminum powder, 38% of bauxite, and 45% of active lime, the dry powders of the three raw materials are evenly mixed to prepare the steel slag modifier of the present invention. Steel slag modifier added:

[0037] After RH finishes processing the molten steel, add 1500kg of the steel slag modifier prepared above into the molten steel;

[0038] After the steel slag modifier is added, press 20Nm to the molten steel in the molten steel tank 3 The amount of argon gas per hour was stirred for 10 min under weak argon gas.

[0039] All the rest are carried out according to the conventional process.

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PUM

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Abstract

The invention relates to an ultra-low-carbon steel slag modifier and an addition method thereof. The ultra-low-carbon steel slag modifier is formed by carrying out dry mixing on passivated aluminum powder, alumina and active lime. The ultra-low-carbon steel slag modifier comprises the following chemical components in percentage by weight: 10-20% of Al, 15-25% of Al2O3, 40-50% of CaO, at most 8% of SiO2, at most 1% of C, at most 0.05% of S and at most 0.05% of P. After an RH (Ruhrstahl Heraeus, vacuum circulation degassing) furnace finishes treating molten steel, the steel slag modifier is added to 2-4 times of the amount of slag on the ladle top, and the molten steel is stirred in weak argon for 5-10 minutes. The invention can obviously lower the degree of turbulence in the pouring process of IF (interstitial-free) steel, degrade the oxidizability of the IF steel slag, reduce the reoxidation generated in the pouring process of the molten steel, avoid nozzle clogging, enhance the pourability of the molten steel, and ensure the quality of the molten steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, in particular to a steel slag modifier for smelting IF steel (ultra-low carbon steel) and a method for adding the same. Background technique [0002] When steelmaking plants using converters produce interstitial-free steel (i.e. IF steel or ultra-low carbon steel), oxygen blowing is required for decarburization, and the molten steel cannot be deoxidized again, so the converter must produce boiling steel. Since the molten steel cannot be deoxidized, the oxidizing property of the steel slag is very strong, even after the RH (vacuum circulation degassing furnace) treatment, the strong oxidizing property of the steel slag cannot be changed. In the later stage of molten steel pouring, due to the effect of eddy current, strong oxidizing steel slag will be involved in the tundish, causing secondary pollution to molten steel. Moreover, the generated inclusions will also aggravate the blockage of the...

Claims

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Application Information

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IPC IPC(8): C21C5/36
Inventor 毛志勇魏元王鹏郭猛吴世龙孙艳霞孟宪娟
Owner ANGANG STEEL CO LTD
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