Low-cost converter steelmaking deoxidization process

A converter steelmaking, low-cost technology, applied in the manufacture of converters, etc., can solve the problems of high cost per ton of steel, increased non-metallic inclusions, and difficulty in floating into slag, etc., to reduce the content of non-metallic inclusions, reduce oxide inclusions, Effect of reduction in deoxidation cost

Active Publication Date: 2016-06-22
RIZHAO BAOHUA NEW MATERIAL CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the deoxidation methods used in the domestic industrial steelmaking production process mainly include: aluminum deoxidation method, adding metal aluminum to the molten steel in the ladle when tapping the steel. This deoxidation method is relatively simple, but the deoxidation effect is unstable, and Al is easy to form 2 o 3 Such non-metallic inclusions, small particles of such inclusions are not easy to float up into slag, resulting in an increase of non-metallic inclusions in steel, and the price of aluminum exceeds 10,000 yuan/ton, and the cost of steel per ton is high; carbon deoxidation method is added to the ladle before tapping For carbon-containing materials, this deoxidation method is relatively simple, and the deoxidation effect is also unstable, which is prone to safety hazards caused by molten steel "turning over" and will increase the carbon content of molten steel; there are also methods such as silicon-calcium alloy deoxidation method, core wire deoxidation method, etc. , although

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  • Low-cost converter steelmaking deoxidization process

Examples

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Example Embodiment

[0023] Example 1

[0024] For killed steel (steel grade A36Cr) process steps:

[0025] (1) Open the ladle to the tapping position of the converter, open the bottom blowing system, and the bottom blowing flow rate is 300m 3 / h;

[0026] (2) Shaking furnace releases the steel and starts timing. After 20s tapping, 0.58kg / t of elemental carbon powder is added (0.58kg per ton of steel), and the elemental carbon powder is added within 40S after tapping. In order to better achieve carbon powder deoxidation, the bottom blowing flow rate is reduced to 200m after adding carbon 3 / h, at this time, carbon powder is deoxidized to produce CO gas to participate in the stirring of molten steel. In addition, in order to prevent premature addition of carbon powder causing molten steel to "turn over" and cause safety accidents, the general tapping time is about 7 minutes, so the appropriate time for adding elemental carbon powder is within the time range of 20-60S after tapping to ensure carbon The p...

Example Embodiment

[0031] Example 2

[0032] For killed steel (steel grade Q345B3) deoxidation process steps:

[0033] (1) Open the ladle to the tapping position of the converter, open the bottom blowing system, and the bottom blowing flow rate is 250m 3 / h;

[0034] (2) Start timing when the steel is put in the shaker, and 0.36kg / t of elemental carbon powder is added after 40s of tapping. After adding carbon, the bottom blowing flow rate is reduced to 150m 3 / h, the elemental carbon powder will be added within 60S after tapping;

[0035] (3) After the carbon powder is added at an interval of 25S, add 1.5kg / t of composite deoxidizer, and all composite deoxidizers are added within the time range of 80S~130S after tapping; the composition (mass fraction) of the composite deoxidizer is 47.5% silicon, 24.5% calcium, 28% barium.

[0036] In this embodiment, the elemental carbon powder is added at 60S after tapping, and all the composite deoxidizers are added at 130S.

Example Embodiment

[0037] Example 3

[0038] For killed steel (steel grade Q235B2) deoxidation process steps:

[0039] (1) Open the ladle to the tapping position of the converter, open the bottom blowing system, and the bottom blowing flow rate is 200m 3 / h;

[0040] (2) Start timing when the steel is put in the shaking furnace, and start adding 0.17kg / t of elemental carbon powder after tapping 58S. After adding carbon, the bottom blowing flow rate is reduced to 100m 3 / h, the elemental carbon powder will be added within 60S after tapping;

[0041] (3) After adding the carbon powder at an interval of 20S, add 1.8kg / t of composite deoxidizer, and add all composite deoxidizers within 130S~180S after tapping; the composition (mass fraction) of the composite deoxidizer is 44.4% silicon, 25.9% calcium, 27.7% barium and 2% aluminum.

[0042] In this embodiment, the elemental carbon powder is added in 60S after tapping, and all the composite deoxidizer is added in 180S.

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Abstract

The invention discloses a low-cost converter steelmaking deoxidization process. The process is characterized in that in the converter steel tapping process, carbon powder and a composite deoxidization agent are added for segmented deoxidization, the content of total oxygen in molten steel is reduced by controlling the deoxidization occasion and optimizing the steel tapping deoxidization operation process, the low-price carbon powder and the composite deoxidization agent are used for replacing a traditional aluminum and iron deoxidization agent, deoxidization cost can be greatly reduced, and meanwhile, non-metallic inclusion is reduced. By means of the deoxidization process, the ratio of inclusion, with the level smaller than or equal to 1.5, in steel is increased to 98.21%, the continuous casting fluctuation flow rate is reduced to 0.32%, the deoxidization cost of each ton of steel is reduced by 1.58 RMB yuan, and profit margin is increased for enterprises while steel quality is improved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking production, in particular to a low-cost converter steelmaking deoxidation process. Background technique [0002] Excessive oxygen is dissolved into the molten steel at the end of converter steelmaking, and the excess oxygen precipitates out when the molten steel solidifies to form oxide inclusions and bubbles, which directly affect the quality of cast slabs and steel products. Therefore, in the steelmaking process, it is necessary to reduce the oxygen content at the end of the converter, which is the source of inclusions in the steel. At present, the deoxidation methods used in the domestic industrial steelmaking production process mainly include: aluminum deoxidation method, adding metal aluminum to the molten steel in the ladle when tapping the steel. This deoxidation method is relatively simple, but the deoxidation effect is unstable, and Al is easy to form 2 o 3 Such non-metallic inclusi...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/064C21C5/28
CPCC21C5/28C21C7/0006C21C7/0025C21C7/06C21C7/064C21C7/0645
Inventor 蒲锐张云田孙作迎朱国军
Owner RIZHAO BAOHUA NEW MATERIAL CO LTD
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