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Production method of ultra-low sulfur ultra-low phosphorus ultra-low carbon steel

A technology of ultra-low carbon steel and production method, applied in the direction of manufacturing converters, etc., can solve the problem of difficult desulfurization, and achieve the effects of low production cost, suitable for popularization and use, and high dephosphorization rate

Active Publication Date: 2019-05-10
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

[0007] The technical problem to be solved by the present invention is: currently, the deep desulfurization of pre-deoxidized steel and steel is difficult, and it is impossible to realize the stable production of ultra-low sulfur and ultra-low phosphorus ultra-low carbon steel at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Embodiment 1 adopts the inventive method to produce ultra-low sulfur, ultra-low phosphorus, ultra-low carbon steel

[0071] The specific operation steps are as follows:

[0072] (1) Vanadium extraction converter: add 23kg / t 钢 The activated lime is used for vanadium extraction and dephosphorization; the position of the oxygen lance is controlled at 2.2m in the first 5 minutes of blowing, and the position of the oxygen lance is 1.9m 3 minutes before the end of blowing.

[0073] (2) Desulfurization station: add passivated lime 4kg / 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 0.080% to about 0.003%.

[0074] (3) Steel-making converter: scrap steel 50kg / t can be added into the converter 钢 . Add active lime 22kg / t 钢 , high magnesium lime 12kg / t 钢 , slagging agent 13kg / t 钢 Carry out converter slagging dephosphorization. Add high magnesium lime or...

Embodiment 2

[0084] Embodiment 2 adopts the inventive method to produce ultra-low sulfur, ultra-low phosphorus, ultra-low carbon steel

[0085] The specific operation steps are as follows:

[0086] (1) Vanadium extraction converter: add 17kg / t 钢 The activated lime is used for vanadium extraction and dephosphorization; the position of the oxygen lance is controlled at 2.0m in the first 3 minutes of blowing, and the position of the oxygen lance is 1.7m 5 minutes before the end of blowing.

[0087] (2) Desulfurization station: add passivated lime 8kg / t 钢 , passivated magnesium 0.8kg / t 钢 , the rate of calcium spraying is 44kg / min, and the rate of spraying magnesium is 9kg / min, which can reduce the sulfur content in steel from 0.082% to about 0.0028%.

[0088] (3) Steel-making converter: scrap steel 50kg / t can be added into the converter 钢 . Add active lime 22kg / t 钢 , high magnesium lime 12kg / t 钢 , slagging agent 13kg / t 钢 Carry out converter slagging dephosphorization. Add high magnesi...

Embodiment 3

[0098] Embodiment 3 adopts the inventive method to produce ultra-low sulfur, ultra-low phosphorus, ultra-low carbon steel

[0099] The specific operation steps are as follows:

[0100] (1) Vanadium extraction converter: add 20kg / 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 3 minutes before the end of blowing;

[0101] (2) Desulfurization station: add passivated lime 6kg / t 钢 , passivated magnesium 1.7kg / t 钢 , spray calcium at a rate of 46kg / min, and spray magnesium at a rate of 10kg / min, which can reduce the sulfur content in steel from 0.078% to about 0.0026%.

[0102] (3) Steel-making converter: scrap steel 50kg / t can be added into the converter 钢 . Add active lime 18kg / t 钢 , high magnesium lime 15kg / t 钢 , slagging agent 14kg / t 钢 Carry out converter slagging dephosphorization. Add high magnesium lime or dolomit...

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PUM

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Abstract

The invention belongs to the field of steel smelting, and particularly relates to a production method of ultralow sulphur and ultralow phosphorus ultralow-carbon steel in order to solve the problems that the deep desulfuration difficulty of pre-deoxidation molten steel at present is high, and stable production of ultralow-carbon steel being ultralow in sulphur and ultralow in phosphorus simultaneously cannot be realized. The production method comprises the steps that dephosphorization in a vanadium extraction rotary furnace, desulfuration, dephosphorization and decarbonization in a steel-making converter, deep dephosphorization in a LF refining furnace, dephosphorization and slag removal in a desulfuration station, and refining in a RH furnace are carried out. Through a substep dephosphorization mode, the dephosphorization effect and the desulphurization rate are improved and raised, and steel slag rephosphoration and resulfurization are prevented effectively. The ultralow sulphur andultralow phosphorus ultralow-carbon steel with [P] being less than or equal to 0.002%, [S] being less than or equal to 0.003% and [C] being less than or equal to 0.003% can be prepared, the productionmethod is simple, no additional equipment is established, and the production method is low in production cost and is suitable for 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 ultra-low-sulfur, ultra-low-phosphorus, and ultra-low-carbon steel. Background technique [0002] Ultra-low carbon steel refers to steel with [C]≤0.005%, and its products are widely used in automobile manufacturing, can manufacturing and other industries. In order to obtain good deep drawing performance, high-quality ultra-low carbon steel has extremely high requirements on the control of C, S, N and other elements in the steel, and the production is very difficult. For example, high-quality automotive panel steel has high requirements on the cleanliness of molten steel. At present, only a few companies in China have basically a certain production capacity, and the country mainly relies on imports. Therefore, in order to speed up the localization process of high-end varieties of steel, we must break through the traditional thinking mode i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C7/068C21C7/10C21C5/30
CPCC21C5/30C21C7/0645C21C7/068C21C7/10
Inventor 张敏曾建华龚洪军张彦恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP