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Production method of clean steel

A production method and technology for cleaning steel, applied in the direction of manufacturing converters, etc., can solve problems such as difficulty in reduction, and achieve the effects of low production cost, simple operation, and speeding up the process of localization

Active Publication Date: 2019-11-08
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

[0008] The technical problem to be solved by the present invention is: the sum of S, P, H, N and O content in steel existing in the production of ultra-low carbon clean steel is relatively high, especially the content of S and O in pre-deoxidized steel is difficult to reduce For the problem of extremely low value, the present invention does not need to build additional equipment, and can be completed in existing equipment after changing the process flow (P+S+O+N+H)≤50×10 -6 of clean steel production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1 produces clean steel with the inventive method

[0070] The specific operation process is as follows:

[0071] (1) Vanadium extraction converter: add 15kg / t 钢 Vanadium extraction and dephosphorization are carried out with activated lime; the oxygen lance position is controlled by 2.1 for 3 minutes in the early stage of blowing, and the oxygen lance position is 1.7m 5 minutes before the end of blowing;

[0072] (2) Desulfurization station: add passivated lime 8kg / t 钢 , passivated magnesium 0.5kg / t 钢 , The rate of calcium spraying is 40kg / min, the rate of spraying magnesium is 12kg / min, and the sulfur content in steel is reduced from 0.075% to 0.0028%.

[0073] (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, an...

Embodiment 2

[0082] Embodiment 2 produces clean steel with the inventive method

[0083] The specific operation process is as follows:

[0084] (1) Vanadium extraction converter: add 25kg / t 钢 Vanadium extraction and dephosphorization are carried out with activated lime; the position of the oxygen lance is controlled at 2.0m for 5 minutes in the early stage of blowing, and the position of the oxygen lance is 1.8m for 3 minutes before the end of blowing;

[0085] (2) Desulfurization station: add passivated lime 3kg / t 钢 , passivated magnesium 2.0kg / t 钢 , spray calcium at a rate of 35kg / min, and spray magnesium at a rate of 12kg / min, which can reduce the sulfur content in steel from 0.068% to about 0.0025%.

[0086] (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 ...

Embodiment 3

[0095] Embodiment 3 produces clean steel with the inventive method

[0096] (1) Vanadium extraction converter: add 19kg / t 钢 Vanadium extraction and dephosphorization are carried out with active lime; the oxygen lance position is controlled at 2.0m in the first 4 minutes of blowing, and the oxygen lance position is 1.9m 4 minutes before the end of blowing;

[0097] (2) Desulfurization station: add passivated lime 6kg / t 钢 , passivated magnesium 0.8.0kg / t 钢 , spray calcium at a rate of 42kg / min, and spray magnesium at a rate of 10kg / min, which can reduce the sulfur content in steel from 0.069% to about 0.0022%.

[0098] (3) Steelmaking converter: add active lime 13kg / t 钢 , high magnesium lime 20kg / t 钢 , slagging agent 12kg / t 钢 Carry out converter slagging and dephosphorization, add 0.6kg / t slagging agent according to the final slag status 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 ...

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Abstract

The invention belongs to the field of steel smelting, and specifically relates to a production method for clean steel. The invention provides a production method for clean steel, with regard to the problems of high content sum of S, P, H, N and O in steel, and low cleanliness, existing in the present ultra-low carbon clean steel production. The production method comprises the following steps: dephosphorization in a vanadium extraction converter, desulfuration, dephosphorization and decarburization in a steel-making converter, deep dephosphorization in an LF refining furnace, dephosphorizationand slagging-off in a desulfuration station, refining in the LF furnace, refining in an RH furnace, and the like, and the dephosphorization effect is improved and the desulfuration rate is increased in a manner of stepwise dephosphorization. The production method disclosed by the invention is capable of controlling the contents of P, S, O and the like in molten steel to be kept at extremely low levels, and finally the clean steel with the content sum (P+S+O+N+H) of not greater than 50*10<-6>. The production method disclosed by the invention is simple to operate, without the need of additionalequipment building, and low in production cost.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a production method of clean steel. Background technique [0002] Clean steel refers to the steel grade with low content of five major impurity elements S, P, H, N and O in steel, and strict control of non-metallic inclusions (mainly oxides and sulfides) in steel. When the purity of the material reaches a certain level, some mutations will occur in its properties, such as ultra-pure iron (w Fe >99.995%) is equivalent to the corrosion resistance of gold or platinum; in 18Cr2NiMo stainless steel, when w(P) is reduced from 0.026% to 0.002%, its nitric acid corrosion resistance is increased by more than 100 times. The low cleanliness of molten steel leads to a large gap and instability in product performance compared with similar foreign products, which is a prominent common problem faced by my country's iron and steel enterprises, which seriously restricts the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/06C21C7/064C21C7/068C21C7/10
CPCC21C5/28C21C7/06C21C7/064C21C7/068C21C7/10
Inventor 曾建华张敏龚洪军张彦恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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