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Control method of precipitates and inclusions in twin-roll strip continuous casting of non-oriented silicon steel

A twin-roll thin-strip continuous casting and oriented silicon steel technology is applied in the field of metallurgy to simplify the production process, increase control means, and realize the effect of type

Active Publication Date: 2016-10-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Control method of precipitates and inclusions in twin-roll strip continuous casting of non-oriented silicon steel
  • Control method of precipitates and inclusions in twin-roll strip continuous casting of non-oriented silicon steel
  • Control method of precipitates and inclusions in twin-roll strip continuous casting 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 field of metallurgical technology. Aiming at the problem that there is no suitable control method for precipitates and inclusions in the process of producing non-oriented silicon steel by twin-roller thin strip continuous casting, a twin-roller thin strip continuous casting process of non-oriented silicon steel is proposed. Methods for controlling precipitates and inclusions. The method is to solidify and shape the non-oriented silicon steel molten steel through a double-roller thin strip continuous casting machine, with a cast strip thickness of 2.0 to 2.6mm; after the cast strip comes out of the roll and enters the post-casting secondary cooling section, it is slowly cooled through the slow cooling chamber; Entering the third cooling section, it is quickly cooled immediately; the cast strip that has been quickly cooled in the third cooling section is cooled and then coiled to obtain a non-oriented silicon steel cast strip. Through this method, the AlN precipitates in the cast strip can reach the level of 0.5-2.0 μm, while the MnS precipitation is significantly suppressed, basically eliminating the influence of both on the growth of recrystallized grains and the movement of magnetic domain walls, laying the foundation for the development of high-quality stainless steel. Grain-oriented silicon steel lays the foundation.

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 Patents(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 LIAONING
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