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Method for reducing longitudinal cracks in surface of large-section continuously cast billet

A continuous casting billet and longitudinal crack technology, applied in the field of metallurgy, can solve the problems of increased production cost, large metal burnout, prone to surface longitudinal cracks, etc., and achieves the effect of reducing the static pressure of molten steel, uniform thickness and reducing scratches

Inactive Publication Date: 2019-05-24
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As a special steel enterprise, Wuyang Iron and Steel Co., Ltd. produces peritectic steel, high-strength steel, and chrome-molybdenum steel continuous casting slabs, which are particularly prone to surface longitudinal cracks. The depth of longitudinal cracks can reach 20mm, the length can reach more than 2000mm, and the width can reach 5mm. , the metal burns a lot during cleaning, and sometimes it is necessary to refill the production, which increases the production cost

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  • Method for reducing longitudinal cracks in surface of large-section continuously cast billet
  • Method for reducing longitudinal cracks in surface of large-section continuously cast billet
  • Method for reducing longitudinal cracks in surface of large-section continuously cast billet

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Embodiment 1

[0028] Steel type in this embodiment: WDB620D, billet specification: 200mm (thickness) * 1800mm (width), the method for reducing longitudinal cracks on the surface of large-section continuous casting slabs includes the following steps:

[0029] (1) Before casting the billet, turn on all the cooling water and strengthen the inspection of the nozzle leakage phenomenon. It is found that the water at the narrow edge of the inner and outer arcs of the 0# section is normal, and the water flow of the nozzles at the 1-5-S1 and 2-5-N1 positions is inclined. 4 -1-N1, 6-7-S1, 9-3-S1 position nozzles have small water volume, 7-1-N1, 13-1-S1 position nozzles have no water, and the replacement nozzles should be handled by professionals; arc alignment between sectors The accuracy error is controlled at 5-7mm, which meets the requirements; the cooling water is fully turned on, and the slag with a thickness of ≥15mm is removed online;

[0030] (2) The mold taper value is set to: 6mm, the cryst...

Embodiment 2

[0035] Steel type in this embodiment: S45C, billet specification: 300mm (thickness) * 2400mm (width), the method for reducing the longitudinal cracks on the surface of large-section continuous casting slabs includes the following steps:

[0036] (1) Before casting the billet, turn on all the cooling water and strengthen the inspection of the nozzle leakage phenomenon. It is found that the water at the narrow edge of the inner and outer arcs of the 0# section is normal, and the water flow of the nozzles at the positions 2-3-S1 and 5-7-N1 is inclined. 5 -1-S1, 6-8-S1, 9-4-S1 nozzles have a small amount of water, and the nozzles should be replaced by professionals; the arc alignment accuracy error between the sectors is controlled at 8-9mm, which meets the requirements; fully open the cooling water, On-line removal of slag skin with thickness ≥ 15mm was found, and slag skin was found in the 3# segment, and it was cleaned manually into the casting machine;

[0037] (2) The mold ta...

Embodiment 3

[0042] Steel type in this embodiment: SA387Gr12Cl2, billet specification: 330mm (thickness)*1800mm (width), the method for reducing the longitudinal cracks on the surface of large-section continuous casting slabs includes the following steps:

[0043](1) Before casting the billet, turn on all the cooling water and strengthen the inspection of the nozzle leakage phenomenon. It is found that the water at the narrow edge of the inner and outer arcs of the 0# section is normal, and the water flow of the nozzles at the positions 3-4-S1 and 6-7-N1 is inclined. 5 -3-S1, 10-8-S1, 11-4-S1 nozzles have a small water volume, and the replacement nozzles should be handled by professionals; the arc alignment accuracy error between the segments is controlled at 3-5mm, which meets the requirements; fully open the cooling water, On-line removal of slag with thickness ≥15mm;

[0044] (2) The taper value of the crystallizer is set to 13.5, the crystallizer amplitude is 2.5mm; the water temperatu...

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Abstract

The invention discloses a method for reducing longitudinal cracks in the surface of a large-section continuously cast billet. The method specifically comprises the steps: the section taper of 200 mm,300 mm and 330 mm is increased; the vibration amplitude of a crystallizer is increased; the drawing speed of the billet is reasonably controlled; and the atomization effect of a nozzle is improved. The section taper of 200 mm, 300 mm and 330 mm is increased, the contact degree between a billet shell and the crystallizer is increased, and tearing stress of the billet shell attached to the wall of the crystallizer is lowered; slag crusts with the slag crust thickness being larger than or equal to 15 mm are cleared, and scratching of the slag crusts to the billet shell of the billet is reduced; the vibration amplitude of the crystallizer is increased, and heat resistance is reduced; the drawing speed of the billet is reasonably controlled, and thus the thickness of the primary billet shell iseven; the atomization effect of a nozzle is improved, and thus cooling in the cast billet drawing process is even; a convex-bottom-type immersion water gap is used, and growth of the billet shell isfacilitated; and a steel plate with the qualified longitudinal cracks is obtained.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for reducing longitudinal cracks on the surface of large-section continuous casting slabs. Background technique [0002] Today's world economy is in a downturn, the steel industry has overcapacity, production costs remain high, the overall profit of the steel industry is not high, and the steel industry is in a state of meager profit or loss. Especially for medium and heavy plate enterprises, as more and more iron and steel enterprises pour into the competition in the medium and heavy plate market, Wugang is facing severe challenges. [0003] As a special steel enterprise, Wuyang Iron and Steel Co., Ltd. produces peritectic steel, high-strength steel, and chrome-molybdenum steel continuous casting slabs, which are particularly prone to surface longitudinal cracks. The depth of longitudinal cracks can reach 20mm, the length can reach more than 2000mm, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16
Inventor 李杰龙杰王青刘丹付冬阳付振坡袁平赵晓辉王全胜彭世宝赵向政刘德胜
Owner WUYANG IRON & STEEL
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