Method for preparing high silicon steel cold-rolled strip steel based on thin-strip continuous casting

A technology of cold-rolled strip steel and high-silicon steel, which is applied in the field of preparation of cold-rolled strip steel based on thin-strip continuous casting high-silicon steel, can solve problems such as reduction of energy consumption, reduction of production costs, and complex rolling procedures, and achieve improvement Machinability, energy saving, effect of reducing order degree

Active Publication Date: 2017-09-15
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is based on thin strip continuous casting and adopts hot rolling and warm rolling. Although it can successfully prepare high-silicon steel finished plates, it

Method used

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  • Method for preparing high silicon steel cold-rolled strip steel based on thin-strip continuous casting

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Embodiment 1

[0031] In this embodiment, based on the preparation method of thin-strip continuous casting high-silicon steel cold-rolled strip, proceed as follows:

[0032] Smelt molten steel according to the set composition, its composition by weight percentage is: C 0.003%, Si 6.49%, Mn0.22%, Al 0.02%, S 0.025%, N 0.011%, Nb 0.03%, V 0.04%, O 0.0015% , and the rest is Fe.

[0033] Strip continuous casting process: Preheat the tundish at a temperature of 1200°C, then pour molten steel into the tundish, control the degree of superheat to 25°C, and flow the molten steel through the tundish into two counter-rotating crystallization rolls Solidify into thin strips, control the casting speed to 45m / min, and the thickness to 2.2mm;

[0034] After the cast strip is taken out of the roll, it is cooled to 550°C at a rate of 80°C / s under nitrogen atmosphere conditions for coiling to obtain a cast strip coil;

[0035] The cast strip coils are pickled to remove surface scale and coated with Al 2 o ...

Embodiment 2

[0040] In this embodiment, based on the preparation method of thin-strip continuous casting high-silicon steel cold-rolled strip, proceed as follows:

[0041] The molten steel is smelted according to the set composition, and its composition by weight percentage is: C 0.003%, Si 6.1%, Mn 0.30%, Al 0.018%, S 0.03%, N 0.020%, Nb 0.014%, V 0.04%, O 0.001%, The rest is Fe.

[0042] Strip continuous casting process: Preheat the tundish at a temperature of 1250°C, then pour molten steel into the tundish, control the degree of superheat to 50°C, and flow the molten steel through the tundish into two counter-rotating crystallization rolls Solidify into a thin strip, control the casting speed to 40m / min, and the thickness to 2.5mm;

[0043] After the cast strip is taken out of the roll, it is cooled to 600°C at a rate of 60°C / s under nitrogen atmosphere conditions for coiling to obtain a cast strip coil;

[0044] The cast strip coils are pickled to remove surface scale and coated with...

Embodiment 3

[0049] In this embodiment, based on the preparation method of thin-strip continuous casting high-silicon steel cold-rolled strip, proceed as follows:

[0050] The molten steel is smelted according to the set composition, and its composition by weight percentage is: C 0.002%, Si 6.7%, Mn 0.18%, Al 0.03%, S 0.022%, N 0.009%, Nb 0.02%, V 0.01%, O 0.001%, The rest is Fe.

[0051] Strip continuous casting process: Preheat the tundish at a temperature of 1230°C, then pour molten steel into the tundish, control the degree of superheat to 30°C, and flow the molten steel through the tundish into two counter-rotating crystallization rolls Solidify into a thin strip, control the casting speed to 50m / min, and the thickness to 3.0mm;

[0052] After the cast strip is taken out of the roll, it is cooled to 580°C at a rate of 90°C / s under nitrogen atmosphere conditions for coiling to obtain a cast strip coil;

[0053] The cast strip coils are pickled to remove surface scale and coated with ...

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Abstract

The invention belongs to the field of steel material preparation, and relates to a method for preparing high silicon steel cold-rolled strip steel based on thin-strip continuous casting. According to the method, molten steel is smelted according to set components, wherein the components comprise, by weight percentage, 0.002-0.005% of C, 4.0-7.0% of Si, 0.1-0.3% of Mn, 0.01-0.04% of Al, 0.02-0.03% of S, 0.008-0.020% of N, 0.02-0.05% of Nb, 0.01-0.04% of V, less than or equal to 0.002% of O, and the balance Fe and inevitable impurities; the Mn, the Al, the Nb, the V and other second phase forming elements are added into high silicon steel and are uniformly dispersed and separated out in the heat treatment process of a cast strip, and therefore normal growth of ferrite grains can be inhibited, occurrence of abnormal growth can be promoted, the texture of the cast strip can be optimized, and the machinability can be improved; and then low-temperature hot rolling is carried out on the cast strip, the degree of order of the high silicon steel can be further reduced, and the cold rolling process can be finally realized. The method for preparing the high silicon steel cold-rolled thin strip has the advantages of being short in process and high in efficiency, a final product is good in strip shape, and the method can be widely realized in the process and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of iron and steel material preparation, and relates to a method for preparing cold-rolled strip steel based on thin-strip continuous casting of high-silicon steel. Background technique [0002] The silicon content in ordinary silicon steel is generally controlled below 3.5% (mass ratio, the same below). Studies have shown that increasing the silicon content in silicon steel to 4.0-6.7% (called high silicon steel) will significantly increase the resistivity and magnetic permeability, reduce the coercive force, thereby reducing iron loss and optimizing the performance of silicon steel. Especially when the silicon content is 6.5%, silicon steel not only has low iron loss, but also has a magnetostriction coefficient close to 0, which is of great significance for saving energy consumption and reducing noise. But higher silicon content increases the yield strength and tensile strength of silicon steel, while reducing the e...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/12B22D11/06
CPCB22D11/0622C21D8/1211C21D8/1227C21D8/1233C21D8/1244C21D8/1283C22C38/001C22C38/004C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 卢翔方烽兰梦飞张元祥王洋曹光明李成刚袁国王国栋
Owner NORTHEASTERN UNIV
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