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Control method for reducing liquid level fluctuation in hypo-peritectic steel production

A control method and subperitectic technology are applied in the control field of reducing liquid level fluctuations in the production of subperitectic steel, which can solve the problems of liquid level fluctuations and affect production, achieve the reduction of liquid level fluctuations, ensure stable production, Attenuate the effect of the peritectic reaction

Active Publication Date: 2021-11-23
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although liquid level fluctuations can be alleviated, liquid level fluctuations still occur, seriously affecting production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The present invention will be further described by taking the production of steel grades with a carbon content of 0.08% to 0.10% as an example.

[0039] A control method for reducing liquid level fluctuations in the production of subperitectic steel, specifically comprising:

[0040] 1. Refining heating time is 5 minutes.

[0041] 2. Add ferrosilicon 0.68kg / t and medium carbon ferromanganese 0.64kg / t.

[0042] 3. The carbon content is controlled at 0.083% at the end of refining.

[0043] 4. The superheat of molten steel is 30°C.

[0044] 5. Use mold flux with an alkalinity of 1.35.

[0045] 6. The flow rate of the water seam on the wide side of the crystallizer is 6m / s, and that on the narrow side is 7m / s.

[0046] 7. The roll gap of the casting machine before production is ±0.5mm, and the pass rate is 92%.

[0047] 8. The nozzle blockage rate is 1.87%.

[0048] 9. The specific water volume of the secondary cooling is 0.9kg / t.

Embodiment 2

[0050] The present invention will be further described by taking the production of steel grades with a carbon content of 0.12% to 0.14% as an example.

[0051] A control method for reducing liquid level fluctuations in the production of subperitectic steel, specifically comprising:

[0052] 1. Refining heating time is 6 minutes.

[0053] 2. Add ferrosilicon 0.56kg / t and medium carbon ferromanganese 0.51kg / t.

[0054] 3. The carbon content is controlled at 0.136% at the end of refining.

[0055] 4. The superheat of molten steel is 29°C.

[0056] 5. Use mold flux with an alkalinity of 1.35.

[0057] 6. The flow rate of the water seam on the wide side of the crystallizer is 6m / s, and that on the narrow side is 7m / s.

[0058] 7. The casting machine roll gap ±0.5mm pass rate is 94% before production.

[0059] 8. The nozzle blockage rate is 1.92%.

[0060] 9. The specific water volume of the secondary cooling is 0.9kg / t.

Embodiment 3

[0062] The present invention will be further described by taking the production of steel grades with a carbon content of 0.10% to 0.12% as an example.

[0063] A control method for reducing liquid level fluctuations in the production of subperitectic steel, specifically comprising:

[0064] 1. Refining heating time is 6 minutes.

[0065] 2. Add ferrosilicon 0.41kg / t and medium carbon ferromanganese 0.51kg / t.

[0066] 3. The carbon content is controlled at 0.118% at the end of refining.

[0067] 4. The superheat of molten steel is 32°C.

[0068] 5. Use mold flux with an alkalinity of 1.35.

[0069] 6. The flow rate of the water seam on the wide side of the crystallizer is 6m / s, and that on the narrow side is 7m / s.

[0070] 7. The roll gap of the casting machine before production is ±0.5mm, and the pass rate is 93%.

[0071] 8. The nozzle blockage rate is 1.85%.

[0072] 9. The specific water volume of the secondary cooling is 0.9kg / t.

[0073] The present invention aims ...

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Abstract

The invention relates to the technical field of hypo-peritectic steel production, in particular to a control method for reducing liquid level fluctuation in hypo-peritectic steel production. The method comprises the following steps of 1) weakening peritectic reaction by adopting the following measures: A, controlling the refining heating time to be less than or equal to 10 min; B, supplementing an alloy in a refining station, and controlling the alloy supplementing amount to be smaller than 1.5 kg / t; and C, controlling the carbon content when refining is finished; 2) aiming at uniform growth of a blank shell in a crystallizer, taking the following measures of A, increasing the superheat degree of molten steel and controlling to be 20 to 50 DEG C; B, enabling the alkalinity of casting powder to be not lower than 1.35; C, controlling the flow speed of a water seam of the crystallizer to be 6.0 m / s to 8.0 m / s; and D, enabling the pulling speed to be constant; and 3) aiming at the bulging of a casting blank in a secondary cooling section, taking the following measures of A, enabling a roll gap of a casting machine before production to be + / -0.5 mm, and controlling the qualification rate of the roll gap; B, enabling the water nozzle blocking rate to be not larger than 2 percent; and C, improving the strength of secondary cooling water, wherein the secondary cooling specific water flow is larger than or equal to 0.9 kg / t. According to the control method for reducing liquid level fluctuation in hypo-peritectic steel production provided by the invention, the hypo-peritectic steel production liquid level fluctuation is reduced by 70 percent or above, and stable and smooth production is guaranteed.

Description

technical field [0001] The invention relates to the technical field of hypoperitectic steel production, in particular to a control method for reducing liquid level fluctuations in the production of hypoperitectic steel. Background technique [0002] Hypoperitectic steel refers to ordinary carbon steel with a carbon content of 0.07% to 0.17%. Since it is in the peritectic region (L+δ—γ) during casting and solidification, it is prone to peritectic phase transformation and causes volume shrinkage. This uneven volume shrinkage results in uneven thickness of the slab shell, and the resulting bulge is continuously squeezed in the sector of the continuous casting machine, making the crystallizer liquid level fluctuations continue to increase, affecting the quality of the slab, and even breakouts in severe cases. [0003] At present, the main control method is to reduce the pulling speed and increase the thickness of the billet shell. Although liquid level fluctuations can be allev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/116B22D11/18B22D11/111B22D11/22
CPCB22D11/16B22D11/116B22D11/18B22D11/111B22D11/225Y02P10/20
Inventor 潘统领杜林高立超王一名宋玉李玉德
Owner ANGANG STEEL CO LTD
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