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Method of rapid cooling to control magnetic properties of twin-roll strip continuous casting low-silicon non-oriented silicon steel

A twin-roll thin strip continuous casting, oriented silicon steel technology, applied in the field of metallurgy

Active Publication Date: 2016-08-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the study found that in the thin strip continuous casting process of medium and low silicon steel, the "δ→γ→α" phase transformation occurs during the cooling process of the cast strip after solidification

Method used

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  • Method of rapid cooling to control magnetic properties of twin-roll strip continuous casting low-silicon non-oriented silicon steel
  • Method of rapid cooling to control magnetic properties of twin-roll strip continuous casting low-silicon non-oriented silicon steel
  • Method of rapid cooling to control magnetic properties of twin-roll strip continuous casting low-silicon non-oriented silicon steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The chemical composition of low-silicon non-oriented silicon steel is: C: 0.0032%, Si: 1.41%, Mn: 0.35%, Al: 0.21%, O: 0.0043%, S: 0.005%, N: 0.0045%, The rest is Fe and uncontrollable impurities; the non-oriented silicon steel is smelted into molten steel, and the pouring temperature of the molten steel is 1560-1563°C. Composed of steel rollers and side sealing plates, the molten steel solidifies and forms rapidly after contacting the crystallized roller surface of the steel rollers to obtain a cast strip with a thickness of 2.5±0.2mm;

[0026] (2) After the casting strip enters the cooling section, spray water to cool the casting strip, control the starting cooling temperature at 1240-1250°C, the final cooling temperature at 900-910°C, and the cooling rate at 50-60°C / s, and then at 500-510°C ℃ to coil the cast strip; to obtain a cast strip with a coarse and uniform structure;

[0027] Depend on figure 2 (a) and image 3 (a) It can be seen that the grain size r...

Embodiment 2

[0034] (1) Low-silicon non-oriented silicon steel according to the mass percentage of chemical composition: C: 0.0034%, Si: 0.80%, Mn: 0.22%, Al: 0.40%, O: 0.0043%, S: 0.005%, N: 0.0045%, the rest It is Fe and uncontrollable impurities; the non-oriented silicon steel is smelted into molten steel, and the pouring temperature of the molten steel is 1578-1582°C. Composed of steel roll and side sealing plate, molten steel solidifies and forms rapidly after contacting the crystallized roll surface of the steel roll, and obtains a cast strip with a thickness of 2.5±0.3mm;

[0035] (2) After the casting strip enters the cooling section, spray water to cool the casting strip, control the starting cooling temperature at 1200-1205°C, the final cooling temperature at 915-920°C, and the cooling rate at 70-100°C / s, and then at 600-605°C ℃ simulated coiling;

[0036] Statistics of grain structure and orientation distribution are shown in Table 2:

[0037] Statistics of cast strip structur...

Embodiment 3

[0042] (1) Low-silicon non-oriented silicon steel according to the mass percentage of chemical composition: C: 0.0028%, Si: 0.42%, Mn: 0.39%, Al: 0.34%, O: 0.0043%, S: 0.005%, N: 0.0045%, the rest It is Fe and uncontrollable impurities; the non-oriented silicon steel is smelted into molten steel, and the pouring temperature is controlled to be about 1600°C. The molten steel is poured into the molten pool of the twin-roll thin strip continuous casting machine through the tundish, and the molten pool is formed by the rotating steel roll. Composed of side sealing plates, the molten steel solidifies and forms rapidly after contacting the crystalline roll surface of the steel roll, and a cast strip with a thickness of 2.5±0.3mm is obtained;

[0043] (2) After the casting strip enters the cooling section, spray water to cool the casting strip, control the starting cooling temperature at 1200-1205°C, the final cooling temperature at 940-945°C, and the water cooling rate at about 80-10...

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Abstract

The invention belongs to the technical field of metallurgy, and provides a method for controlling the magnetic performance of double-roll thin-strip continuous cast low-silicon non-oriented silicon steel through rapid cooling for solving the problem of influence on the quality of silicon steel due to'theta-gamma-alpha' phase change occurring in a cooling process after the condensation of a cast strip during a thin-strip casting process for medium-silicon and low-silicon steel. The method comprises the following steps of: pouring molten low-silicon non-oriented silicon steel in rotary steel rolls, and rapidly condensing and forming to obtain a cast strip with a thickness of 2.5+ / -0.3 mm; conveying the cast strip in a cooling section and carrying out water-spray cooling, and then coiling; and carrying out acid pickling on the coiled cast strip and then carrying out cold rolling to obtain strip steel with a thickness of 0.5 mm, annealing the strip steel, and punching and then annealing to eliminate the residual stress. The method disclosed by the invention is simple in process control, capable of obtaining a thin strip blank with a proper grain size and a high favourable texture, and capable of obtaining non-oriented silicon steel with good magnetic performance for a high-efficiency motor through the subsequent cold rolling and heat treatment processes.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling the microstructure and magnetic properties of low-silicon non-oriented silicon steel by rapid cooling in the secondary cooling stage of twin-roll strip continuous casting. Background technique [0002] Non-oriented silicon steel is a Si-Fe alloy with very low carbon content. In the steel plate after deformation and annealing, its grains are distributed in random orientation. The product is usually a cold-rolled plate or strip with a nominal thickness of 0.5mm and 0.65mm, mainly used in the manufacture of motors and generators. The performance of silicon steel sheets is not only directly related to the loss of electric energy, but also determines the performance, volume, weight and cost of products such as motors and transformers. And improving the magnetic induction intensity is the goal that the non-oriented silicon steel manufacturing in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06B22D11/06C21D8/12
CPCY02P10/20
Inventor 许云波张元祥王洋卢翔方烽焦海涛曹光明李成刚刘振宇王国栋
Owner NORTHEASTERN UNIV LIAONING
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