Grain-oriented electrical steel sheet and manufacturing method thereof

A technology for oriented electrical steel sheets and manufacturing methods, which is applied in the direction of manufacturing tools, metal material coating processes, furnaces, etc., and can solve problems such as reduced yield, magnetic deviation between outer and inner coils, and difficult processes

Active Publication Date: 2021-04-02
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the current final high-temperature annealing process performs batch annealing in the coil state, so the following difficulties in the process occur
First, the temperature deviation between the outer coiled part and the inner coiled part of the coil due to the heat treatment in the coil state occurs, and the same heat treatment method cannot be applied to each part, resulting in magnetic deviation between the outer coiled part and the inner coiled part
Second, after decarburization annealing, MgO is coated on the surface, and in the process of forming the basecoat (Basecoating) in high temperature annealing, various surface defects occur, so the actual yield will be reduced
Third, the decarburized sheet that has been decarburized and annealed is rolled into a coil form, and then subjected to flattening annealing for insulation coating after high-temperature annealing. Therefore, the production process is divided into three steps, resulting in a decrease in yield.

Method used

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  • Grain-oriented electrical steel sheet and manufacturing method thereof
  • Grain-oriented electrical steel sheet and manufacturing method thereof
  • Grain-oriented electrical steel sheet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

manufacture example

[0089] Production example: Manufacture of grain-oriented electrical steel sheet substrate

[0090] A steel slab containing 3.23% Si by weight, 0.25% C by weight, and Fe and other unavoidable impurities in the remaining % is heated at a temperature of 1250° C., hot-rolled with a thickness of 1.6 mm, and then annealed at a temperature of 870 ℃ and a dew point temperature of 60 ℃ for 120 seconds, and then annealing and cooling the hot-rolled sheet at an annealing temperature of 1100 ℃ for 200 seconds in an atmosphere of hydrogen and nitrogen mixed gas with a dew point temperature of 0 ℃ or less. , carry out pickling and conduct a cold rolling at a reduction rate of 60%.

[0091] After the cold-rolled plate is annealed again at an annealing temperature of 870°C and a dew point temperature of 60°C for 60 seconds, it is then annealed at an annealing temperature of 1100°C for 50 seconds in an atmosphere of hydrogen, hydrogen, and nitrogen with a dew point temperature below 0°C. Seco...

Embodiment 1

[0107] The grain-oriented electrical steel sheet substrate produced in the production example was pickled using a 25% by weight aqueous HCl solution at 80°C. After that, Al is formed on the entire surface of the steel sheet with a thickness of 3 μm 2 o 3 film.

[0108] Table 3 shows changes in thickness and magnetic properties of the original steel sheets according to pickling time. In addition, the amount of oxygen in the oxygen-deficient layer at a depth of 3 μm from the surface was measured and shown in Table 3. In addition, the iron loss magnetic flux density was measured by a single sheet measurement method, and the iron loss (W 17 / 50 ) and the magnetic flux density induced under a magnetic field of 1000A / m (B 10 ). The results thereof are shown in Table 3 below.

[0109] 【table 3】

[0110]

[0111] As shown in Table 3, the magnetic properties of Invention Material 1 to Invention Material 7 subjected to the pickling step were superior to those of Comparative Mat...

Embodiment 2

[0113] The grain-oriented electrical steel sheet substrate produced in the production example was pickled using a 25% by weight aqueous HCl solution at 80°C. Thereafter, ceramic powder was supplied to a heat source for plasmaization with argon (Ar) gas at an output of 200 kW, thereby forming a ceramic coating layer. At this time, a pattern was formed with a coating width (w) of 30 mm and a coating interval (d) of 20 mm. The types of ceramics and the thickness of the ceramic coating were changed according to Table 4 below, and the corresponding changes in magnetic properties are shown in Table 4.

[0114] 【Table 4】

[0115]

[0116] As shown in Table 2, the improvement in magnetic properties can be more achieved by properly forming the ceramic coating.

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Abstract

According to one embodiment of the present invention, a method for manufacturing a grain-oriented electrical steel sheet comprises the steps of: providing a slab including, by wt%, 1.0-4.0% of Si, 0.1%-0.4% of C, and the balance of Fe and other inevitably mixed in impurities; reheating the slab; hot-rolling the slab so as to manufacture a hot rolled steel sheet; hot band-annealing the hot rolled steel sheet; primarily cold-rolling the hot band-annealed hot rolled steel sheet; decarbonization-annealing the primarily cold-rolled steel pipe; secondarily cold-rolling the steel sheet having been completely decarbonization-annealed; finally annealing the steel sheet having been completely secondarily cold-rolled; pickling the steel sheet having been completely finally annealed; and forming a ceramic coating layer on the steel sheet having been completely pickled.

Description

technical field [0001] The present invention relates to oriented electrical steel sheet and its manufacturing method. Background technique [0002] The grain-oriented electrical steel sheet is a soft magnetic material formed of crystal grains of {110}<001>, also called Goss (Goss) orientation, and has excellent magnetic properties in the rolling direction. [0003] Such a grain-oriented electrical steel sheet is manufactured by heating a billet, rolling it to a final thickness by hot rolling, hot-rolled sheet annealing, and cold rolling, and then performing high-temperature annealing for primary recrystallization annealing and formation of secondary recrystallization. [0004] At this time, it is known that the slower the rate of temperature rise during high-temperature annealing, the higher the degree of aggregation of the secondary recrystallized Goss orientation and the better the magnetic properties. Generally, the temperature rise rate in high temperature anneali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C22C38/02C21D9/46C23G1/08C23C4/134
CPCC21D8/12C21D9/46C22C38/02C23G1/08C23C4/134C21D8/1222C21D8/1233C21D8/1244C21D8/1261C21D8/1266C21D8/1272C23C4/11
Inventor 高炫昔权玟锡徐进旭
Owner 浦项股份有限公司
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