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Continuous casting tundish nozzle replacement process

A continuous casting tundish and tundish technology, applied in manufacturing tools, casting equipment, metal processing equipment, etc., can solve problems such as the impact of operation time on slab quality

Pending Publication Date: 2021-07-09
CHONGQING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The replacement process of the tundish nozzle is related to the quality of the slab and the operation safety. During the replacement process of the existing nozzle, the quality of the slab is affected due to the long operation time of the replacement nozzle, improper temperature parameters, and pulling speed.

Method used

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  • Continuous casting tundish nozzle replacement process

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Effect test

Embodiment

[0034] Such as figure 1 As shown, this embodiment provides a continuous casting tundish nozzle replacement process. During the operation steps, it is necessary to wear labor protection articles and put down the protective mask to effectively prevent facial burns. The specific operation of the continuous casting tundish nozzle replacement process is as follows:

[0035] S1. Baking the new nozzle, 40min≤baking time≤240min.

[0036] S2. Confirm the heat number of the water port, and confirm the speed of the oil cylinder. Confirm the cylinder speed one batch of steel in advance to control the crystallizer liquid level fluctuation during the replacement process. The continuous casting machine in this embodiment is a slab continuous casting machine, and includes a continuous casting machine with a section of 230 mm and a continuous casting machine with a section of 300 mm. The speed of the oil cylinder of the continuous casting machine with a section of 230mm is controlled at 10....

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Abstract

The invention provides a continuous casting tundish nozzle replacement process. The process comprises the following steps that S1, a new nozzle is baked; S2, the number of furnaces for changing the nozzles is determined, the speed of an oil cylinder of a continuous casting machine is determined before one furnace of steel, the speed of the oil cylinder of the continuous casting machine with the section being 230mm is controlled to be 10.15-15.225m / min, and the speed of the oil cylinder of the continuous casting machine with the section being 300mm is controlled to be 12.25-18.375m / min; S3, the target temperature of molten steel in a tundish is increased by 5-10 DEG C; S4, the argon amount is reduced to 1 / 3 that of the normal process; S5, the pulling speed of the continuous casting machine is reduced; S6, a blind plate on the tundish is dismantled; S7, the new nozzle is clamped to a crystallizer cover plate from the baking position through a nozzle clamping device; S8, nozzle replacement is conducted; S9, the blind plate is reinstalled; and S10, the nozzle replacing speed increase is controlled to be 0.1m / min-0.15m / min, the speed is increased by 0.01m / min every 5s, and when the speed is increased to 70% of typical pulling speed, the pulling speed is stabilized for 1-2min, and then the speed is increased to the typical pulling speed again. According to the scheme, the nozzle replacement efficiency is effectively improved, safety accidents in the nozzle replacement process are reduced, and the slab production quality is guaranteed.

Description

technical field [0001] The invention belongs to the field of continuous casting, and in particular relates to a continuous casting tundish nozzle replacement process. Background technique [0002] The replacement of the continuous casting tundish nozzle is related to the continuous casting production and the improvement of operation efficiency, and there are certain safety risks. The replacement process of the tundish nozzle is related to the quality of the slab and the safety of the operation. During the replacement process of the existing nozzle, the quality of the slab is affected due to the long operation time of replacing the nozzle, improper temperature parameters, and casting speed. Contents of the invention [0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a continuous casting tundish nozzle replacement process to improve nozzle replacement efficiency and reduce the impact of nozzle replacement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/56
CPCB22D41/56
Inventor 曾令文刘渝邓吉祥
Owner CHONGQING IRON & STEEL CO LTD
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