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Casting method capable of reducing longitudinal cracks in surfaces of wide and thick plate continuous casting billets

A technology for wide and thick plates and continuous casting billets is applied in the field of casting to reduce longitudinal cracks on the surface of continuous casting billets of wide and thick plates, so as to optimize the production process, solve the longitudinal cracks in the casting, and reduce the superheat of the casting.

Active Publication Date: 2020-01-03
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Adjust and optimize the key process and equipment parameters of the wide and thick slab continuous casting machine, control from the crack source, reduce the probability of longitudinal cracks during the solidification of molten steel, and effectively solve the problem of longitudinal cracks in the continuous casting of wide and thick slabs

Method used

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  • Casting method capable of reducing longitudinal cracks in surfaces of wide and thick plate continuous casting billets
  • Casting method capable of reducing longitudinal cracks in surfaces of wide and thick plate continuous casting billets

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Embodiment 1

[0027] A pouring method for reducing longitudinal cracks on the surface of thick slab continuous casting slabs, the pouring method is:

[0028] 1. Before starting pouring, determine the temperature of the steel in the refining process according to the condition of the ladle and the temperature drop in the process, so as to ensure that the superheat of the tundish at the beginning of pouring is not too high, specifically 10-20°C.

[0029] 2. Confirm that the "big arm high position light" and "roaster high position light" on the operation box of the tundish car are on; loosen the stopper locking device;

[0030] 3. Immediately after pressing the "Pouring Position" button of the operation box, the tundish will automatically rise to the highest position, and the tundish car will run to the "Pouring Position"; during the walking process of the tundish car, remove the submerged nozzle insulation felt and check the side hole of the nozzle and inner cavity;

[0031] 4. Close the pres...

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Abstract

The invention provides a casting method capable of reducing longitudinal cracks in the surfaces of wide and thick plate continuous casting billets. System research and control are carried out on multiple aspects that the superheat degree of molten steel is controlled before casting of a continuous casting machine, novel casting slag special for wide and thick plates is researched and developed, acasting pulling rate curve of the continuous casting machine is developed, a submersed nozzle low-position casting manner of the continuous casting machine is researched and developed in a self-service manner, and the emergence time is reasonably and accurately controlled, stress concentration is reduced, the protecting slag film grain homogenization is improved, billet shells in a crystallizer have enough setting time, the quality of the wide and thick plate continuous casting machine cast casting billets is improved, and the percent of pass of the casting billets under the non-steady condition of the longitudinal cracks of the casting billets is reduced.

Description

technical field [0001] The invention relates to a pouring method for reducing longitudinal cracks on the surface of continuous casting slabs of wide and thick plates, and belongs to the technical field of continuous casting in metallurgical production. Background technique [0002] The longitudinal cracks on the surface of the slab are generated in the mold, and the molten steel flows into the mold through the submerged nozzle to form the primary slab shell. Due to the uneven distribution of heat flow, the growth thickness of the slab shell is uneven, and stress is generated at the weaker part of the slab shell near the center of the slab. Concentrate to form the source of cracks. As the slab enters the secondary cooling chamber and is cooled and subjected to the static pressure of molten steel, the cracks further expand along the direction of the pulling speed and form longitudinal cracks. To put it simply, longitudinal cracks generally form a rudiment inside the crystalliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18B22D11/111
CPCB22D11/111B22D11/18
Inventor 张丽郭伟达王忠刚赵立峰卢波高志滨陈永生张海波公斌
Owner SHANDONG IRON & STEEL CO LTD
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