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Converter production technology for extremely-low-Mn steel

A production process and extremely low technology, applied in the field of converter production process of ultra-low Mn steel, can solve the problems such as the inability to meet the production requirements of ultra-low Mn steel, achieve the effects of improving refining rate, avoiding waste of cost, and reducing production cost

Active Publication Date: 2019-11-15
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

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  • Converter production technology for 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 technology for extremely-low-Mn steel. The converter production technology includes the following steps that molten iron and waste steel are adopted as raw materials, converter blowing is conducted, tapping is conducted, and extremely-low-Mn steel liquid is obtained; the raw materials are controlled, wherein the temperature and chemical components of the molten iron are controlled, and the waste steel ratio and chemical components of the waste steel are controlled; in the converter blowing process, top-bottom combined blowing converter steel makingand double-slag operation are adopted; top-bottom combined blowing includes top blowing of oxygen and bottom blowing of inertia gas, during top blowing of the oxygen, the lance position of an oxygenlance is 1.6 m-2.4 m, the oxygen supply strength is 700 N m<3> / min, and during bottom blowing of the inertia gas, the gas supply strength ranges from 400 N m<3> / min to 600 N m<3> / min; when a converterblowing end point is reached, the temperature of the end point and the oxygen content of the steel liquid are controlled; and during tapping, the tapping slag discharging amount is smaller than or equal to 1.5 tons, and a modification agent is added for conducting top slag modification.

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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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