Production method for extremely-low-phosphorous steel

A production method and technology for phosphorus steel, applied in the field of iron and steel smelting, can solve problems such as the inability to obtain extremely low phosphorus steel, and achieve the effects of reduced phosphorus content, simple operation and important economic benefits

Inactive Publication Date: 2018-01-09
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

This method can only obtain ultra-low phosphorus steel, but not ultra-low phosphorus steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1 adopts the method of the present invention to prepare very low phosphorus steel

[0062] Include the following steps:

[0063] (1) Vanadium extraction converter: add 15kg / t 钢 Vanadium extraction and dephosphorization are carried out with activated lime; the position of the oxygen lance is controlled at 2.2m for 3 minutes in the early stage of blowing, and the position of the oxygen lance is 1.9m for 5 minutes before the end of blowing;

[0064] (2) Desulfurization

[0065] Adopt conventional method to carry out desulfurization;

[0066] (3) Steelmaking converter: add active lime 15kg / t 钢 , high magnesium lime 16kg / t 钢 , slagging agent 12kg / t 钢 Carry out converter slagging dephosphorization, add 0.3kg / t slagging agent according to the final slag status of converter before tapping 钢 , Strong stirring for 1min to tap the steel, and the amount of slag in the converter to tap the steel is 20mm.

[0067] (4) LF refining: LF further dephosphorizes molten st...

Embodiment 2

[0071] Embodiment 2 adopts the method of the present invention to prepare very low phosphorus steel

[0072] Include the following steps:

[0073] (1) Vanadium extraction converter: add 25kg / t 钢 Vanadium extraction and dephosphorization are carried out with active lime; the oxygen lance position is controlled at 2.0m for 5 minutes in the early stage of blowing, and the oxygen lance position is 1.7m for 3 minutes before the end of blowing;

[0074] (2) Desulfurization

[0075] Adopt conventional method to carry out desulfurization;

[0076] (3) Steelmaking converter: add active lime 8kg / t 钢 , high magnesium lime 25kg / t 钢 , slagging agent 10kg / t 钢 Carry out converter slagging and dephosphorization, add slagging agent 1kg / t according to the final slag condition of converter before tapping 钢 , Strong stirring for 3 minutes to tap the steel, and the amount of slag in the converter to tap the steel is 35mm.

[0077] (4) LF refining: LF further dephosphorizes molten steel, and...

Embodiment 3

[0081] Embodiment 3 adopts the method of the present invention to prepare very low phosphorus steel

[0082] (1) Vanadium extraction converter: add 19kg / t 钢 Vanadium extraction and dephosphorization are carried out with activated lime; the oxygen lance position is controlled at 2.0m in the first 4 minutes of blowing, and the oxygen lance position is 1.8m 4 minutes before the end of blowing;

[0083] (2) Desulfurization station:

[0084] Desulfurization is carried out by adding passivated lime and passivated magnesium particles;

[0085] (3) Steelmaking converter: add active lime 16kg / t 钢 , high magnesium lime 20kg / t 钢 , slagging agent 12kg / t 钢 Carry out converter slagging and dephosphorization, add 0.7kg / t slagging agent before tapping 钢 , Strong stirring for 2 minutes to tap the steel, and the amount of slag in the converter to tap the steel is 15mm.

[0086] (4) LF refining: LF enters the station and adds 5kg / t 钢 active lime, 1.5kg / t 钢 bauxite, after heating for 10mi...

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Abstract

The invention belongs to the field of steel smelting and particularly relates to a production method for extremely-low-phosphorous steel. The production method for the extremely-low-phosphorous steelis used for solving the problem that when an existing method is used for producing low-phosphorous steel, it is difficult to reduce the phosphorous content to 0.002% or below, and consequently it is difficult to produce the extremely-low-phosphorous steel. The production method for the extremely-low-phosphorous steel comprises the steps of vanadium recovering converter dephosphorization, desulfuration, steelmaking converter dephosphorization and decarburization, LF finery deep dephosphorization, desulphurization station dephosphorization slagging off, LF refining and the like. By means of a step-by-step dephosphorization manner, the dephosphorization effect is improved, the dephosphorization rate is increased, the phosphorous content in molten steel can be reduced to 5*10<-6> or below. Compared with the low-phosphorous produced in the prior art, the phosphorous content in the low-phosphorous steel produced through the production method is reduced 10 times or above. The production method is simple, the equipment requirement is not high, and the production method is worthy of popularization and use.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a production method of extremely low phosphorus steel. Background technique [0002] At present, the cleanliness of molten steel is low, the content of phosphorus, sulfur and other elements in steel is high and it is difficult to control stably, resulting in a large gap and instability in product performance compared with similar foreign products. The process of localization of steel varieties. Phosphorus is a harmful element in most steel types. Steel types such as low-temperature steel, marine steel, hydrogen-induced cracking steel, and steel for some thick plates require both extremely low sulfur content and phosphorus content in steel. <0.01% or 0.005%. At present, when producing low-phosphorus steel, iron and steel enterprises in Japan, South Korea and other countries adopt converter pre-dephosphorization and realize large-scale industrial production; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/06C21C7/068C21C5/30
CPCY02P10/20
Inventor 张敏曾建华龚洪军张彦恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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