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Control method for total aluminum content of high-titanium steel

A control method and technology of aluminum content, applied in the direction of manufacturing converters, etc., can solve the problems of nozzle nodules, affecting the quality of molten steel and the number of continuous pouring tanks, and high total aluminum content, so as to alleviate molten steel flocculation and reduce B-type inclusions , The effect of improving the purity of molten steel

Inactive Publication Date: 2017-01-11
ANGANG STEEL CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it is easy to cause nodulation at the nozzle during the molten steel pouring process, which affects the quality of molten steel and the number of continuous pouring tanks
In order to increase the yield of titanium, the titanium is adjusted in the refining and reducing atmosphere, resulting in high total aluminum content in molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The steel grade is AERS-G, containing 0.25% titanium.

[0016] 1. Large tank rinsing tank: high-titanium steel uses a special large tank, and the large tank is produced 3 times with aluminum-free steel turnover before it goes online to ensure the cleanliness of the large tank.

[0017] 2. One-time titanium adjustment for converter tapping: the carbon content of the tapping is controlled at 0.05%, special ferrosilicon and ferromanganese are added for deoxidation in the tapping process, high-titanium ferro-titanium is used for titanium adjustment, and the tapping amount reaches 1 / 3 of the ladle capacity Start to add high-titanium ferro-titanium, the amount of high-titanium ferro-titanium added = ferro-titanium amount 600kg × ferro-titanium content 70% × 0.8 ≥ upper limit of steel composition (0.30%); converter tapping temperature is 1670 ° C, during tapping process The argon gas is controlled at 250NL / min, and 1.5kg / t of lime is added after tapping.

[0018] 3. Molten st...

Embodiment 2

[0021] The steel grade is AS-2, containing 0.15% titanium.

[0022] 1. Large tank rinsing tank: high titanium steel uses a special large tank, and the large tank is produced 4 times with aluminum-free steel turnover before it goes online to ensure the cleanliness of the large tank.

[0023] 2. One-time titanium adjustment for converter tapping: the carbon content of the tapping is controlled at 0.065%, special ferrosilicon and ferromanganese are added for deoxidation in the tapping process, high-titanium ferro-titanium is used for titanium adjustment, and the tapping amount reaches 1 / 3 of the ladle capacity Start to add high-titanium ferro-titanium, the amount of high-titanium ferro-titanium added = ferro-titanium content 400kg × ferro-titanium content 70% × 0.8 ≥ the upper limit of steel composition (0.20%); The argon gas is controlled at 270NL / min, and 1.5kg / t of lime is added after tapping.

[0024] 3. Molten steel slag removal: After tapping, enter the molten steel slag r...

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Abstract

The invention provides a control method for the total aluminum content of high-titanium steel. The control method for the total aluminum content of the high-titanium steel comprises the steps that a big tank special for the high-titanium steel is transferred twice or over through aluminum-free steel before being placed on a line; the content of tapping carbon of a converter is larger than 0.04%, the temperature is 1660-1690 DEG C, special silicon iron and ferromanganese are added firstly in the steel tapping process for deoxidization, high-titanium ferrotitanium is used for titanium modification, the high-titanium ferrotitanium starts to be added when the steel tapping amount reaches one third of the volume of a steel ladle, argon is controlled to 200-300 NL / min, and 1-2 kg of lime is added per ton after steel tapping is completed; slagging-off is conducted in a molten steel slagging-off station after steel tapping, the thickness of a slag surface is smaller than or equal to 10 mm after slagging-off, and 2-4 kg of lime is added per ton for covering the tank after slagging-off is completed; and refining argon is controlled to 200-300 NL / min, and the titanium content is adjusted to be half or over of the content of all elements of the steel in the middle stage. By the adoption of the control method for the total aluminum content of the high-titanium steel, the total aluminum content of the high-titanium steel can be stably controlled to be lower than 0.005%, the content of class-B inclusions in the steel is decreased, flocculating flow of the molten steel is relieved, and the purity of the molten steel is improved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a method for controlling the total aluminum content of high-carbon steel. Background technique [0002] At present, in the production of high-titanium steel with a titanium content of 0.15-0.25%, low-titanium ferro-titanium, high-titanium ferro-titanium and titanium wire are generally used for titanium adjustment. Due to the high residual aluminum content in titanium-containing alloys, it is more difficult to smelt some high-titanium steels that require lower total aluminum content. At the same time, it is easy to cause nodulation at the nozzle during the molten steel pouring process, which affects the quality of molten steel and the number of continuous pouring tanks. In order to increase the yield of titanium, the titanium is adjusted in the refining and reducing atmosphere, resulting in high total aluminum content in molten steel. Contents of the ...

Claims

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Application Information

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IPC IPC(8): C21C5/30
Inventor 罗建华姜振生宁东常宏伟孙振宇郑毅马升
Owner ANGANG STEEL CO LTD
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