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Smelting method for low-silicon ultralow-sulphur steel

A technology of ultra-low sulfur steel and smelting method, which is applied in the field of metallurgy, can solve problems such as easy silicon increase, and achieve the effect of reducing the amount of silicon increase

Active Publication Date: 2012-08-01
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for smelting low-silicon and ultra-low-sulfur steel, which solves the problem of easy silicon increase in the LF refining and desulfurization process in the prior art. Reasonable arrangement can shorten refining time and improve production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) After pretreatment of KR molten iron, the sulfur content is 0.002%, and the slag removal rate is >95%;

[0033] 2) The silicon content of molten iron after dephosphorization converter smelting is 0.003%;

[0034] 3) The sulfur content of molten steel at the end of decarburization converter smelting is 0.011%, and the basicity of slag is 4.6;

[0035] 4) When the tapping amount is 1 / 5, add 810Kg of small lime lime and 202Kg of fluorite;

[0036] 5) Add 1.2 tons of aluminum and iron when the tapping amount is 2 / 5;

[0037] 6) Sampling and analysis of sulfur content after tapping is 0.0096%, and acid-soluble aluminum content is 0.046%;

[0038] 7) LF refining has not carried out aluminum adjustment operation, the slag alkalinity of the incoming slag is 6.2, and the total iron content is 1.02%;

[0039] 8) Add 2000Kg of small lime, 500Kg of fluorite, 8.6 alkalinity of refining slag, and 0.3% total iron content in the LF refining process;

[0040] 9) After the LF refi...

Embodiment 2

[0042] 1) After KR molten iron pretreatment, the sulfur content is 0.001%, and the slag removal rate is >95%;

[0043] 2) The silicon content of molten iron after dephosphorization converter smelting is 0.002%;

[0044] 3) The sulfur content of molten steel at the end of decarburization converter smelting is 0.011%, and the basicity of slag is 4.4;

[0045] 4) Add 789Kg of small-grain lime and 205Kg of fluorite when the tapping amount is 1 / 5;

[0046] 5) Add 1.3 tons of aluminum and iron when the tapping amount is 2 / 5;

[0047] 6) Sampling and analysis of sulfur content after tapping is 0.0078%, and acid-soluble aluminum content is 0.048%;

[0048]7) LF refining has not carried out aluminum adjustment operation, the slag alkalinity of the incoming slag is 6.5, and the total iron content is 0.94%;

[0049] 8) Add 1500Kg of small lime, 250Kg of fluorite, 6.9 alkalinity of refining slag, and 0.2% total iron content in the LF refining process;

[0050] 9) After the LF refining...

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Abstract

A smelting method for a low-silicon ultralow-sulphur steel belongs to the metallurgy technical field. The smelting process for producing low-silicon ultralow-sulphur steel comprises: molten iron 'complete-three-removal' pretreatment, decarburization converter smelting, and LF refining process. In order to ensure that silicon increase in molten steel during deep desulphurization is prevented, the sulphur content in molten steel for refining pull-in is firstly decreased by KR molten iron desulphurization pretreatment, and the pressure for LF deep desulphurization is reduced; then the silicon content in molten iron in a decarburization converter is decreased by desilication pretreatment in a dephosphorization converter to ensure the alkalinity of the slag in the decarburization converter is more than 4.0. The advantages are that the problem of the easy increase of silicon during the LF refining desulphurization process in the prior art is solved; the refining time is shortened; and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for smelting low-silicon and ultra-low-sulfur steel. The smelting of low-silicon and ultra-low-sulfur steel is produced by adopting the "full three removal" pretreatment of molten iron-decarburization converter smelting-LF refining process craft. Background technique [0002] At present, in most steelmaking plants at home and abroad, desiliconization and dephosphorization of molten iron are carried out simultaneously with decarburization in conventional converters, which makes the silicon content of molten iron entering the converter higher, so the SiO in the slag 2 The content is also relatively high. In addition, because too much slag is easy to cause splashing or slag overflow, the amount of conventional converter slag should not be too large, so the binary alkalinity of slag is low, generally controlled at 3.0-4.0. And the SiO in refining slag 2 Most...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C7/06C21C7/068
Inventor 高圣勇赵运堂朱立新李越杨铁城李永林田志红王莉阳代军单庆林王朝斌周伟李向奎
Owner SHOUGANG CORPORATION
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