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Method for reducing transverse cracks of corners on surface of plate blank

A technology of transverse cracks and corners is applied in the field of reducing transverse cracks at the corners of the slab surface, which can solve problems such as difficult to achieve, and achieve the effects of reducing transverse cracks, saving costs and having broad application prospects.

Pending Publication Date: 2021-09-21
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The production of slabs without defects is the expected goal of continuous casting steel plant production, but due to the constraints of production conditions and other factors, it is actually difficult to achieve

Method used

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  • Method for reducing transverse cracks of corners on surface of plate blank
  • Method for reducing transverse cracks of corners on surface of plate blank
  • Method for reducing transverse cracks of corners on surface of plate blank

Examples

Experimental program
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Effect test

example 1

[0031] The steel type is SS400B, sampling is carried out according to the technical method and high-temperature tensile test is carried out, and the results of area reduction are as follows figure 1 shown. Depend on figure 1 It can be seen that the reduction of area of ​​SS400B is relatively small (less than 60%) when the temperature is 825-900 °C, and the lowest reduction of area is 49.59% at 875 °C, so this temperature range is the third brittle temperature zone of the slab. During the production of this furnace, the billet section was 1250mm×230mm, which ensured a constant casting speed of 1.3m / min, a superheat of 27°C, normal crystallizer liquid level fluctuations, and a secondary cooling ratio of 0.68 / min, which met the requirements of the operating procedures. The chemical composition meets the standard requirements. Measure the temperature at the corner of the narrow face of the slab in the straightening section. The temperature at the center of the narrow face of t...

example 2

[0033] The steel type is L245M, and the sampling is carried out according to the technical method and the high temperature tensile test is carried out. The results of area reduction are as follows: figure 2 shown. Depend on figure 2 It can be seen that the reduction of area of ​​L245M is relatively small (less than 60%) when the temperature is 800-875 ° C, and the lowest reduction of area is 29.44 % at 850 ° C, so this temperature range is the third brittle temperature zone of the slab. During the production of this furnace, the billet section is 1650mm×230mm, which ensures a constant casting speed of 1m / min, a superheat of 29°C, normal crystallizer liquid level fluctuations, and a secondary cooling specific water volume of 0.66L / min, which meets the requirements of the operating procedures. The chemical composition meets the standard requirements. Measure the temperature at the corner of the narrow face of the slab in the straightening section. The temperature at the cent...

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Abstract

The invention discloses a method for reducing transverse cracks at corners on the surface of a plate blank. According to the method, high-temperature mechanical properties of a steel grade are analyzed by using a thermal simulation testing machine, a third brittleness temperature zone of the steel grade is accurately found, and the transverse cracks at the corners of a casting blank are reduced by controlling a continuous casting process, so that the cleaning amount of the corner cracks of the casting blank is reduced, the hot charging ratio of the casting blank is improved, the cost is saved, and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for reducing transverse cracks at corners on the surface of slabs. Background technique [0002] Defect-free slab production is the expected goal of continuous casting steel plant production, but limited by production conditions and other factors, it is actually difficult to achieve. Most of the surface defects of continuous casting slabs will remain on the rolled material, which will have a great impact on product quality; some of them will be rolled together with the increase of the rolling ratio during the rolling process. The surface defects of continuous casting slabs include transverse cracks, longitudinal cracks, star-shaped cracks, subcutaneous pinholes and other defects, and the transverse cracks at the corners of the slab surface are the most common defects of casting slabs. Therefore, by studying the surface corner transverse crack defects g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16G01N3/18
CPCB22D11/16G01N3/18G01N2203/0017G01N2203/0062G01N2203/0226
Inventor 韩春鹏张怀军李强段云波李彬钱静秋陈建新刁望才张胤
Owner BAOTOU IRON & STEEL GRP
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