A Converter Production Process of Extremely Low Mn Steel

A production process and an extremely low technology, which are applied in the field of converter production technology of extremely low Mn steel, can solve problems such as the inability to meet the production requirements of extremely low Mn steel, and achieve the effects of improving the smelting rate, avoiding cost waste and reducing production costs.

Active Publication Date: 2021-06-22
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Very low Mn steel (Mn≤0.025%) is usually used as battery anode material for new energy vehicles. At present, when the converter produces low Mn steel, the Mn removal rate in the converter blowing process is 60-65%, and the converter smelting controls the Mn content. At 0.035-0.10%, the average Mn content is 0.055%, while the proportion of Mn content ≤ 0.025% is only 0.26%, which cannot meet the production requirements of extremely low Mn steel

Method used

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  • A Converter Production Process of Extremely Low Mn Steel

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] A converter production process for extremely low Mn steel, comprising the steps of:

[0045] Using molten iron and scrap steel as raw materials, carry out converter blowing, tap steel, and obtain extremely low Mn steel molten steel;

[0046] Controlling the raw material, wherein, controlling the temperature and chemical composition of the molten iron, controlling the scrap ratio and chemical composition of the scrap;

[0047] In the converter blowing process, the converter steelmaking and double slag operations are adopted with top-bottom combined blowing; the top-bottom combined blowing includes top-blown oxygen and bottom-blown inert gas, and the oxygen supply intensity of the top-blown oxygen is 700Nm 3 / min, in the bottom blowing inert gas, the gas supply intensity is 500Nm 3 / min;

[0048] At the end of the converter blowing, control the end temperature and the oxygen content of molten steel;

[0049] In the tapping, the amount of slag lowered during tapping is ...

Embodiment 2

[0059] A converter production process for extremely low Mn steel, comprising the steps of:

[0060]Using molten iron and scrap steel as raw materials, carry out converter blowing, tap steel, and obtain extremely low Mn steel molten steel;

[0061] Controlling the raw material, wherein, controlling the temperature and chemical composition of the molten iron, controlling the scrap ratio and chemical composition of the scrap;

[0062] In the converter blowing process, the converter steelmaking and double slag operations are adopted with top-bottom combined blowing; the top-bottom combined blowing includes top-blown oxygen and bottom-blown inert gas, and the oxygen supply intensity of the top-blown oxygen is 700Nm 3 / min, in the bottom blowing inert gas, the gas supply intensity is 400Nm 3 / min;

[0063] At the end of the converter blowing, control the end temperature and the oxygen content of molten steel;

[0064] In the tapping, the amount of slag removed from the tapping is...

Embodiment 3

[0074] A converter production process for extremely low Mn steel, comprising the steps of:

[0075] Using molten iron and scrap steel as raw materials, carry out converter blowing, tap steel, and obtain extremely low Mn steel molten steel;

[0076] Controlling the raw material, wherein, controlling the temperature and chemical composition of the molten iron, controlling the scrap ratio and chemical composition of the scrap;

[0077] In the converter blowing process, the converter steelmaking and double slag operations are adopted with top-bottom combined blowing; the top-bottom combined blowing includes top-blown oxygen and bottom-blown inert gas, and the oxygen supply intensity of the top-blown oxygen is 700Nm 3 / min, in the bottom blowing inert gas, the gas supply intensity is 600Nm 3 / min;

[0078] At the end of the converter blowing, control the end temperature and the oxygen content of molten steel;

[0079] In the tapping, the amount of slag removed from the tapping i...

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Abstract

The invention provides a converter production process for ultra-low Mn steel, comprising the following steps: using molten iron and steel scrap as raw materials, performing converter blowing, tapping, and obtaining molten steel for ultra-low Mn steel; controlling the raw materials, wherein, controlling the The temperature and chemical composition of molten iron are used to control the scrap steel ratio and chemical composition of the scrap steel; during the converter blowing process, the converter steelmaking and double slag operation are adopted with top-bottom combined blowing; the top-bottom combined blowing includes top-blown oxygen and bottom-blown Blow inert gas, in the top blowing oxygen, the position of the oxygen lance is 1.6-2.4m, and the oxygen supply intensity is 700Nm 3 / min, in the bottom blowing inert gas, the gas supply intensity is 400‑600Nm 3 / min; at the end of the converter blowing, control the end temperature and oxygen content of molten steel; in the tapping, control the amount of slag ≤ 1.5 tons, and add a modifier to modify the top slag.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, in particular to a converter production process for ultra-low Mn steel. Background technique [0002] Very low Mn steel (Mn≤0.025%) is usually used as battery anode material for new energy vehicles. At present, when the converter produces low Mn steel, the Mn removal rate in the converter blowing process is 60-65%, and the converter smelting controls the Mn content. At 0.035-0.10%, the average Mn content is 0.055%, while the proportion of Mn content ≤ 0.025% is only 0.26%, which cannot meet the production requirements of extremely low Mn steel. Contents of the invention [0003] In view of the above problems, the present invention is proposed to provide a converter production process for ultra-low Mn steel that overcomes the above problems or at least partially solves the above problems. [0004] The embodiment of the present invention provides a converter production process for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C5/36
CPCC21C5/35C21C5/36Y02P10/20
Inventor 郝丽霞赵艳宇孙永林李志军朱克然朱殷翔裴兴伟付亮
Owner BEIJING SHOUGANG CO LTD
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