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Method for improving castability of ultra-low carbon steel produced by billet continuous casting machine

A technology for continuous casting of ultra-low carbon steel and billet, applied in the field of smelting, can solve the problems of increased metal and gas loss, waste of cost, unsuitable billet, etc., and achieve the effect of reducing production cost

Inactive Publication Date: 2020-06-19
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcoming is that this steel type can be refined without deep deoxidation. If refining slagging and calcium treatment are used, it will waste costs. Deep deoxidation before carbonization and forced decarburization by blowing oxygen in RH will have adverse effects on cost and inclusions in steel
[0012] In the prior art, there is still a measure of directly decarburizing in RH without LF furnace treatment. The disadvantage is that this method is not suitable for billets, and the slabs still need to be cut into billets in the end. Increased metal and gas losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for improving the castability of ultra-low carbon steel produced by a billet continuous caster, and the steps are as follows:

[0037] 1) Conduct converter smelting: control the tapping temperature to 1702℃, and the carbon in the tapping molten steel is 0.056wt%;

[0038] 2) Refining in LF furnace: Electrode heating is used to bring the molten steel temperature to 1643°C; 2kg / ton steel is added with refining agent 2min before stopping heating; the oxygen content is 763ppm at the end; Al deoxidation is no longer required;

[0039] 3) Decarburization treatment in the RH furnace: the whole process does not blow oxygen to heat up; after deep decarburization, Al is used for final deoxidation, and the oxygen is measured when 1.1Kg / ton steel is added to the aluminum pellet and circulated for 5 minutes. The final deoxidation value is 16ppm , After breaking the vacuum for pouring; because the oxygen content is within the limited range, there is no need to add aluminum;

[0040]...

Embodiment 2

[0044] A method for improving the castability of ultra-low carbon steel produced by a billet continuous caster, and the steps are as follows:

[0045] 1) Conduct converter smelting: control the tapping temperature at 1693℃, and the carbon in the tapping molten steel is 0.064wt%;

[0046] 2) Refining in LF furnace: Electrode heating is used to bring the molten steel temperature to 1640°C; 2kg / ton of steel is added to the refining agent 2min before the heating is stopped; the oxygen content is 715.7ppm at the end; Al deoxidation is no longer required;

[0047] 3) Decarburization treatment in the RH furnace: the whole process does not blow oxygen to heat up; after deep decarburization, Al is used for final deoxidation, and the oxygen is measured when the aluminum shot is added to 1.13Kg / ton steel and circulated for 5 minutes. The deoxidation value is 9.5ppm , Due to the low oxygen content, increase the cycle time by 5 minutes, and then meet the requirements, then break the vacuum for po...

Embodiment 3

[0052] A method for improving the castability of ultra-low carbon steel produced by a billet continuous caster, and the steps are as follows:

[0053] 1) Conduct converter smelting: control the tapping temperature to 1687℃, and the carbon in the tapping molten steel is 0.044wt%;

[0054] 2) Refining in LF furnace: Electrode heating is used to bring the molten steel temperature to 1645°C; 2kg / ton steel is added with refining agent 2min before the heating is stopped; since the oxygen content is 866ppm at the end, the oxygen content is 704ppm after deoxidation by adding aluminum pellets ;

[0055] 3) Decarburization treatment in the RH furnace: the whole process does not blow oxygen to heat up; after deep decarburization, Al is used for final deoxidation, and the oxygen is measured when 1.05Kg / ton steel is added to the aluminum pellet and circulated for 5 minutes. The deoxidation value is 18.4ppm , After breaking the vacuum for pouring, since the oxygen content is within the limited ra...

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PUM

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Abstract

The invention discloses a method for improving castability of ultra-low carbon steel produced by a billet continuous casting machine. The method comprises the following steps of converter smelting; lFfurnace refining; decarburization treatment in an RH furnace; continuous casting; and subsequent rolling. According to the method, calcium treatment is not needed, the tapping temperature is increased to be not lower than 1670 DEG C, an LF furnace is adopted, the oxygen content at the end of refining is controlled, oxygen blowing heating is not needed in RH furnace decarburization treatment, andthe oxygen content in molten steel is tested after decarburization is finished, in this way, the number of pouring furnaces is increased to be not lower than 5, aluminum consumption is reduced to 1-2kg / ton steel from the original 2-4 kg / ton steel, and accordingly the production cost can be reduced by not less than 5%.

Description

Technical field [0001] The invention relates to a smelting method, which is exactly a method for producing ultra-low carbon steel castability, and is particularly suitable for the smelting method of ultra-low carbon steel with a carbon content of less than 100 ppm and a slab size of less than 200 mm. Background technique [0002] At present, the ultra-low carbon steel produced by the billet continuous caster mainly includes two types of steel types: cable steel and industrial pure iron, of which cable steel wire rod is a new steel type developed in recent years. Copper-clad steel wire made of cable steel wire rod is used to replace pure copper copper wire. Ultra-low carbon cable steel belongs to soft copper-clad steel wire. High-end varieties have the following requirements for the main elements in steel: [0003] elementC Si MnPS Alt content ≤0.01≤0.02≤0.1≤0.020≤0.005≤0.015 [0004] The process route is: hot metal pretreatment-converter-LF furnace-RH-continuous casting, of wh...

Claims

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Application Information

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IPC IPC(8): B22D11/116B22D11/113B22D11/111C21C7/076C21C7/06C21C7/10
CPCB22D11/111B22D11/113B22D11/116C21C7/06C21C7/076C21C7/10Y02P10/20
Inventor 廖扬标潘艳华赵中福冯文圣刘东清吴义强陈光友段光豪
Owner 武汉钢铁有限公司
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