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Method for controlling precipitates and impurities in twin-roll thin-strip casting process of non-oriented silicon steel

A technology of twin-roll strip continuous casting and oriented silicon steel, which is applied in the field of metallurgy to achieve the effects of increasing control means, eliminating annealing and recrystallization grain growth and simplifying the production process

Active Publication Date: 2014-12-24
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that there is no suitable control method for precipitates and inclusions in the process of producing non-oriented silicon steel by twin-roll thin strip continuous casting, and to propose a process for producing non-oriented silicon steel by twin-roll thin strip continuous casting. Precipitates and inclusions control methods

Method used

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  • Method for controlling precipitates and impurities in twin-roll thin-strip casting process of non-oriented silicon steel
  • Method for controlling precipitates and impurities in twin-roll thin-strip casting process of non-oriented silicon steel
  • Method for controlling precipitates and impurities in twin-roll thin-strip casting process of non-oriented silicon steel

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Effect test

Embodiment 1

[0032] The chemical composition of experimental steel A is shown in Table 1. The molten steel was poured at a temperature of 1620°C, and poured from a tundish preheated to 1200°C into the molten pool composed of rotating steel rolls and side sealing plates of a twin-roll thin strip continuous casting machine. The speed is 50m / min, the strip temperature is 1422±2°C, and the thickness of the cast strip is 2.2-2.5mm; the cast strip enters the secondary cooling section, passes through the slow cooling chamber with a temperature of 800-850°C, and cools slowly for 15 seconds, the end temperature of the slow cooling section 1310~1320°C; after the high-temperature slow cooling, the cast strip immediately enters the third cooling section for rapid cooling, the cooling rate is 70°C / s, and the final cooling temperature is 800°C; the rapidly cooled cast strip is air-cooled to 400°C for coiling.

[0033] For the principle of casting and rolling process, see figure 1 , figure 2 The equili...

Embodiment 2

[0037] The chemical composition of experimental steel B is shown in Table 2. The molten steel was poured at a temperature of 1580°C, and poured from a tundish preheated to 1200°C into the molten pool composed of rotating steel rolls and side sealing plates of a twin-roll thin strip continuous casting machine. The speed is 60m / min, the strip temperature is 1380°C, and the thickness of the cast strip is 2.2-2.6mm; the cast strip enters the secondary cooling section and passes through the slow cooling chamber with a temperature of 850-900°C. After slow cooling for 10s, the end temperature of the slow cooling section is 1270- 1290°C; after the high-temperature slow cooling, the cast strip enters the third cooling section for rapid cooling, the cooling rate is 60°C / s, and the final cooling temperature is 780°C; the rapidly cooled cast strip is air-cooled to 500°C for coiling.

[0038] cast strip structure such as Figure 7As shown, AlN in the cast strip is precipitated alone, reach...

Embodiment 3

[0042] The chemical composition of experimental steel C is shown in Table 3. The pouring temperature is about 1540°C, and the tundish preheated to 1200°C is poured into the molten pool composed of rotating steel rolls and side sealing plates of the twin-roll thin strip continuous casting machine. The speed is 70m / min, the strip temperature is 1385°C, and the thickness of the cast strip is 2.0-2.4mm; the cast strip enters the secondary cooling section, passes through the slow cooling chamber with a temperature of 850-900°C, and after slow cooling for 12s, the end temperature of the slow cooling section is 1270~ 1280°C; after the high-temperature slow cooling, the cast strip enters the third cooling section for rapid cooling, the cooling rate is 50°C / s, and the final cooling temperature is 750°C; the rapidly cooled cast strip is air-cooled to 600°C for coiling.

[0043] cast strip structure such as Figure 9 As shown, AlN in the cast strip is precipitated alone, reaching the lev...

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Abstract

The invention belongs to the technical field of metallurgy, aims at the problem of not having a proper method for controlling precipitates and impurities in the process of producing non-oriented silicon steel in a twin-roll thin-strip casting manner, and provides a method for controlling the precipitates and impurities in the twin-roll strip casting process of non-oriented silicon steel. The method comprises the following steps of solidifying and forming molten non-oriented silicon steel by a twin-roll thin-strip casting machine so as to obtain cast strips with a thickness of 2.0-2.6 mm; taking the cast strips out of rolls, feeding the cast strips in a secondary cooling zone after casting, and slowly cooling the cast strips in a slow cooling chamber; feeding the cast strips into a tertiary cooling zone for fast cooling; cooling and coiling the cast strips which are subjected to the fast cooling by the tertiary cooling zone, and then obtaining non-oriented silicon steel cast strips. By utilization of the method, AlN precipitates in the cast strips reach a level of 0.5-2.0 microns, and the precipitation of MnS is obviously inhibited, so that the influence of the AlN and MnS precipitates on recrystallized grain growth and magnetic domain-wall movement is essentially eliminated, and a basis is laid for developing high-quality non-oriented silicon steel.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for controlling precipitates and inclusions in the process of twin-roll strip continuous casting of non-oriented silicon steel. Background technique [0002] Non-oriented silicon steel, also known as non-oriented electrical steel, is a very important soft magnetic material as the iron core material of the motor. It is required to achieve the magnetic performance indicators of low iron loss and high magnetic induction. Among them, the size, fraction and distribution state of precipitates and inclusions are an important factor affecting the magnetic properties of materials. These precipitates and inclusions mainly include AlN and MnS, and the influence on the magnetic properties is mainly to inhibit the growth of recrystallized grains during the final annealing process, making the grains smaller than the optimal critical size and increasing the iron loss; on the other han...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/22
Inventor 许云波张元祥王洋方烽卢翔焦海涛曹光明李成刚刘振宇王国栋
Owner NORTHEASTERN UNIV
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