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Device for reducing cast slab corner cracks through flame heating and crack reduction method

A technology of flame heating and casting slabs, which is applied in the field of continuous casting, and can solve problems such as reducing the degree of corner cracking of slabs and increasing the temperature of local slabs

Inactive Publication Date: 2017-03-08
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But so far, there is no method to reduce the degree of corner cracking of the slab by increasing the temperature of the slab locally so that the corner of the slab avoids the third brittle zone

Method used

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  • Device for reducing cast slab corner cracks through flame heating and crack reduction method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] For the ss400 slab, after continuous casting starts, measure the corner temperature of the slab when the casting speed is stable, and set the initial heating power of the flame heater 2 to 50kW according to the measured corner temperature of the slab;

[0023] Turn on the flame heater to heat the corner of the slab; during the heating process, adjust the power of the flame heater according to the temperature measurement result of the corner of the slab by the temperature measuring device. If the corner temperature of the slab is lower than 850°C, increase the flame heating power. If the corner temperature is higher than 890°C, reduce the flame heating power.

[0024] Close the gas supply device and flame heater after continuous casting.

Embodiment 2

[0026] For Q235B slab, after continuous casting starts, measure the corner temperature of the slab when the casting speed is stable, and set the initial heating power of the flame heater 2 to 80kW according to the measured corner temperature of the slab;

[0027] Turn on the flame heater to heat the corner of the slab; during the heating process, adjust the power of the flame heater according to the temperature measurement result of the corner of the slab by the temperature measuring device. If the corner temperature of the slab is lower than 900°C, increase the flame heating power. If the corner temperature is higher than 930°C, reduce the flame heating power.

[0028] Close the gas supply device and flame heater after continuous casting.

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Abstract

The invention discloses a device for reducing cast slab corner cracks through flame heating and a crack reduction method. The device comprises a flame heater, a gas supply device and a temperature measuring device. The flame heater is composed of 4 to 8 flamethrowers. The flamethrowers are arranged on the corners of a cast slab. Each flamethrower can be individually adjusted and controlled. The gas supply device is connected with the flame heater for providing heating fuel for the flame heater. The temperature measuring device is arranged behind the flame heater, namely the slab drawing direction of the cast slab.

Description

technical field [0001] The invention belongs to the field of continuous casting, and relates to quality control of slabs and continuous casting technology, in particular to a device and method for reducing corner cracks of slabs by flame heating. Background technique [0002] The corner crack of continuous casting slab is one of the most important factors affecting the quality of continuous casting slab. In the continuous casting process, molten steel has to go through a series of processes such as phase transformation and crystallization. When the value of is greater than the maximum stress that the billet shell surface can bear, cracks will start to appear on the billet surface. In addition, the presence of inclusions and second-phase particles will cause stress concentration on the slab, causing further extension of surface cracks. The existence of corner cracks greatly reduces the yield of cast slabs, seriously affecting the normal production and economic benefits of s...

Claims

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Application Information

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IPC IPC(8): B22D11/126B22D11/16
Inventor 郭庆涛廖相巍贾吉祥朱晓雷黄玉平唐雪峰邹焕张宇
Owner ANGANG STEEL CO LTD
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