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Methods for deoxidation and nitrogen control in converter tapping for semi-steel making

A steelmaking converter and pre-deoxidation technology, applied in the field of semi-steel steelmaking, can solve the problems of large consumption of deoxidized alloys and nitrogen increase

Active Publication Date: 2017-03-29
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

[0006] The invention provides a method for deoxidation and nitrogen control in semi-steel-making converter tapping, which can solve the problems of high deoxidation alloy consumption caused by high oxygen activity in molten steel during semi-steel smelting and serious nitrogen increase in the tapping process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A converter with a nominal capacity of 120t smelts Q235B steel. Before tapping the steel, the sub-lance was used to sample the molten steel in the converter and determine the oxygen. The oxygen activity in the molten steel at the end point was measured to be 525ppm, and the nitrogen content in the molten steel was 18ppm. After 1 / 3 of the steel is tapped, anthracite is directly used for pre-deoxidation. The amount of anthracite added is 0.2kg per ton of steel. The line is 5m per ton of steel, and the bottom blowing argon intensity is controlled to be 0.001m3 / (min·t steel) when feeding the line. After the end of the line feeding, the oxygen activity of the molten steel is measured to be 10ppm, and the nitrogen content is 21ppm. The amount of deoxidized alloy in the tapping process is greatly reduced. , Nitrogen increase is only 3ppm.

Embodiment 2

[0034] A converter with a nominal capacity of 120t smelts DTLA steel. Before tapping the steel, the sub-lance was used to sample the molten steel in the converter and determine the oxygen. The oxygen activity in the molten steel at the end point was measured to be 860ppm, and the nitrogen content in the molten steel was 21ppm. When 1 / 4-1 / 3 of the steel is tapped, anthracite is used for pre-deoxidation. The amount of anthracite added is 0.2kg per ton of steel. After 1 / 3 of the steel is tapped, ferrosilicon is used for deoxidation. The amount of ferrosilicon added is 2kg per ton of steel. Finally, fix the oxygen at the argon blowing station behind the furnace so that the oxygen activity of molten steel is 100ppm. After the oxygen is fixed, feed the aluminum wire 4m per ton of steel. After the line was finished, the oxygen activity of molten steel was measured to be 8ppm, and the nitrogen content was 25ppm. The amount of deoxidized alloy in the tapping process was greatly reduced...

Embodiment 3

[0036] A converter with a nominal capacity of 120t smelts Q235B steel. Before tapping the steel, the sub-lance was used to sample the molten steel in the converter and determine the oxygen. The measured oxygen activity in the molten steel at the end point was 618ppm, and the nitrogen content in the molten steel was 17ppm. After 1 / 3 of the steel is tapped, anthracite is directly used for pre-deoxidation. The amount of anthracite added is 0.5kg per ton of steel. The line is 5m per ton of steel, and the bottom blowing argon intensity is controlled to be 0.0015m3 / (min·t steel) when feeding the line. After the end of the line feeding, the oxygen activity of the molten steel is 18ppm, and the nitrogen content is 21ppm. The amount of deoxidized alloy in the tapping process is greatly reduced. , Nitrogen increase is only 4ppm.

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a method for conducting deoxidization and nitrogen control on output steel of a semisteel steelmaking converter. The method includes the steps that when the oxygen activity of molten steel at the end point is larger than or equal to 800 ppm and steel is output by one fourth to one third, carburant is adopted for preliminary deoxidization; after steel is output by one third, silicon iron is adopted for deoxidization; after steel is completely output, an aluminum wire is adopted for thorough deoxidization on a blowing-argon-behind-converter platform; when the oxygen activity of molten steel at the end point is larger than or equal to 500 ppm and smaller than 800 ppm and after steel is output by one third, carburant is adopted for preliminary deoxidization; it is ensured that the oxygen activity of molten steel is larger than 500 ppm after steel is output, and the aluminum wire is adopted for thorough deoxidization on the blowing-argon-behind-converter platform after steel is completely output. By means of the process, the deoxidizing material consumption can be effectively lowered, production cost is reduced, and resources are saved; meanwhile, the nitrogen increase volume in the steel output process can be reduced, the nitrogen increase can be stably controlled within 5 ppm, and steel performance is ensured.

Description

technical field [0001] The invention belongs to the technical field of semi-steelmaking steelmaking, and in particular relates to a low-cost deoxidation and nitrogen control method for tapping a converter for semi-steelmaking steelmaking. Background technique [0002] my country is a big country of vanadium-titanium magnetite, which has rich resources of vanadium-titanium magnetite. Domestic iron and steel enterprises such as Panzhihua Iron and Steel, Chenggang, Kunming Iron and Steel, and Weiyang Iron and Steel all use vanadium-titanium magnetite for smelting. Converter steelmaking is the main The raw material is semi-steel after vanadium extraction by special converter. The carbon mass percentage in semi-steel obtained after vanadium-containing molten iron is desulfurized and vanadium is 3.4% to 4.0%. Therefore, the heat source of the semi-steel smelting converter is seriously insufficient, which makes the carbon content of the molten steel at the end of the converter low, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28
Inventor 陈均曾建华梁新腾李盛杨森祥张彦恒黄德胜陈路
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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