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A process method for controlling equiaxed grain rate in the center of oriented silicon steel slab

A technology of equiaxed crystal rate and oriented silicon steel, which is applied in the field of iron and steel metallurgy continuous casting process, can solve the problems of difficult equipment transformation, adverse effects on the development and production of oriented silicon steel, etc. Effect

Active Publication Date: 2021-03-16
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For continuous casting machines that do not have a reserved position for electromagnetic stirring devices, equipment modification is relatively difficult, so it is bound to have a negative impact on the development and production of grain-oriented silicon steel products

Method used

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  • A process method for controlling equiaxed grain rate in the center of oriented silicon steel slab
  • A process method for controlling equiaxed grain rate in the center of oriented silicon steel slab
  • A process method for controlling equiaxed grain rate in the center of oriented silicon steel slab

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Embodiment 1

[0029] The original design of the casting machine did not install an electromagnetic stirring device. When producing oriented silicon steel, measures such as low superheat control, increased secondary cooling strength, and light reduction mode optimization were adopted to increase the equiaxed grain rate of the slab and improve the central segregation of the slab. Table 1 is The control of the superheat of molten steel in the tundish, in which the average superheat of two furnaces is within 3°C.

[0030] Table 1 Superheat degree of molten steel clad in grain-oriented silicon steel

[0031]

[0032] The metallurgical length of the continuous casting machine is 36.9m, the casting speed is controlled at 0.9m / min, the secondary cooling adopts air mist cooling, and the specific water volume is set at 1.17L / Kg, while the specific water volume of ordinary low carbon steel is 1.05L / Kg.

[0033] Dynamic soft reduction is an important measure to improve the central segregation of the...

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Abstract

The invention discloses a method for controlling an oriented silicon steel casting blank equiaxial crystal ratio. On the premise that a fan-shaped section electromagnetic stirring manner is not adopted, through controlling a casting machine molten steel casting superheat degree, optimizing a continuous casting secondary cooling design and optimizing a casting blank dynamic soft reduction mode, theoriented silicon steel casting blank equiaxial crystal ratio can be improved to be more than 80 percent and can reach up to 100 percent at most.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgical continuous casting technology, in particular to a process method for controlling the central equiaxed crystal ratio of an oriented silicon steel billet. Background technique [0002] Since the silicon content of oriented silicon steel reaches 3.0% to 3.3%, well-developed columnar crystals are formed during the solidification process of molten steel, and the proportion of central equiaxed crystals is only 15% to 25%, which has adverse effects on product surface quality control and magnetic properties. Therefore, oriented silicon steel It is generally required that the equiaxed crystal ratio in the center of the slab should be above 50%. [0003] Electromagnetic stirring in the fan-shaped section is an effective method to increase the equiaxed crystal ratio in the center of the billet. It uses the stirring force generated by the electromagnetic stirring device installed in the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18B22D11/22B22D11/12
Inventor 杨峰罗海明张嘉华刘少峰陈胜魏晓东段云波卢晓禹
Owner BAOTOU IRON & STEEL GRP