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Method for manufacturing grain-oriented electrical steel sheet

A technology of oriented electrical steel sheets and manufacturing methods, which is applied in the direction of manufacturing tools, metal material coating processes, coatings, etc., can solve the problems of the difference in the formation of the base coating layer without glass, and can not be commercialized, so as to improve the iron loss Effect

Active Publication Date: 2018-08-31
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

[0010] In addition, according to the conventional method of minimizing the formation of an oxide layer by controlling the oxidizing ability to a low level and thereby maximally controlling the formation of the undercoat layer, when heat treatment is performed in a coil state during high-temperature annealing, according to the high-temperature annealing The position of the plate in the coil, the plate in different positions has different dew point and temperature behavior, at this time there are differences in the formation of the base coating layer and the resulting difference in the degree of glass-free, so that there are differences between the plates in different positions There is a problem of mass production due to deviation
[0011] Therefore, in order to produce low iron loss grain-oriented electrical steel sheets by the current glass-free method, productivity reduction in the decarburization process and high-temperature annealing is unavoidable, so the current situation is that although the glass-free process is technically very useful, it cannot be commercialized.

Method used

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  • Method for manufacturing grain-oriented electrical steel sheet
  • Method for manufacturing grain-oriented electrical steel sheet
  • Method for manufacturing grain-oriented electrical steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0151] Manufactured by weight % including 3.2% Si, 0.055% C, 0.12% Mn, 0.026% Al, 0.0042% N and 0.0045% S and added Sn, Sb and Billets of P. After the slab of the slab composition system 1 was hot-rolled to manufacture a 2.8 mm hot-rolled sheet, the hot-rolled sheet was annealed and pickled, and then cold-rolled to a final thickness of 0.23 mm.

[0152] 【Table 1】

[0153]

[0154] The cold-rolled steel plate is then subjected to recrystallization annealing once, and maintained at a soaking temperature of 875°C in an atmosphere of a mixed gas of 74% by volume of hydrogen, 25% by volume of nitrogen and 1% by volume of dry ammonia. Hold for 180 seconds to carry out decarburization and nitriding treatment. At this time, the temperatures of the heating zone, the first soaking zone, the second soaking zone and the third soaking zone are adjusted to 800 to 900°C. In addition, adjust the dew point of the heating zone to 48°C, adjust the dew point of the first soaking zone to 52°...

Embodiment 2 and comparative example 1 to 16

[0157] Replace the billet with the slab composition system organized in the following Table 2, and the dew points of the heating zone, the first soaking zone, the second soaking zone and the third soaking zone in the first annealing process are shown in Table 2 Adjusted as sorted in , and the annealing separator was adjusted as sorted in Table 2 below to manufacture a grain-oriented electrical steel sheet.

[0158] 【Table 2】

[0159]

[0160]

[0161] Figure 6 A photograph taken with a field emission transmission electron microscope (FE-EPMA) of the side surface of a cold-rolled sheet after performing one recrystallization annealing is shown. It was confirmed that the oxide layer was formed to a thickness of about 5 μm.

experiment example

[0163] The results are summarized in Table 3 below by measuring the roughness, gloss, iron loss and magnetic flux density of the grain-oriented electrical steel sheets produced in Examples 1, 2 and Comparative Examples 1 to 16. The glossiness was defined as the glossiness, and the amount of light reflected from the surface at a reflection angle of 60° was measured based on the specular glossiness of 1,000.

[0164] 【table 3】

[0165]

[0166]

[0167] As shown in Table 3, in the case of Example 1 and Example 2, the thickness of the oxide layer was formed thinner than that of the comparative example, and the removal of the forsterite layer during secondary recrystallization annealing was easy. Therefore, it is possible to obtain a metallic luster type grain-oriented electrical steel sheet which is easy to move magnetic domains. On the other hand, it was confirmed that the amount of oxygen in the oxide layer was similar to that of the comparative example and the decarburi...

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Abstract

A method for manufacturing a grain-oriented electrical steel sheet, according to one embodiment of the present invention, comprises the steps of: manufacturing a steel slab comprising at least one of2-7 wt% of Si, 0.03-0.10 wt% of Sn, and 0.01-0.05 wt% of Sb; manufacturing a hot-rolled sheet by hot-rolling the steel slab; manufacturing a cold-rolled sheet by cold-rolling the hot-rolled sheet; primarily recrystallizing and annealing the cold-rolled sheet; applying an annealing separator to the cold-rolled sheet primarily recrystallized and annealed, and drying the same; and secondarily recrystallizing and annealing the cold-rolled sheet on which the annealing separator has been applied. Primary recrystallizing and annealing are performed such that an oxidized layer, formed on the surface of the cold-rolled sheet, has a thickness of 0.5-2.5 [mu]m and an oxygen amount of 600 ppm or more after primary recrystallizing and annealing. In the secondary recrystallizing and annealing step, a forsterite (Mg2SiO4) coating film can be removed.

Description

technical field [0001] The invention relates to a method for manufacturing a grain-oriented electrical steel sheet. Background technique [0002] The grain-oriented electrical steel sheet refers to an electrical steel sheet that contains 3.1% of Si and has an aggregate structure in which the orientation of crystal grains is aligned along the 100}<001> direction, thereby having extremely excellent magnetic properties along the rolling direction. Grain-oriented electrical steel sheets are mainly used as iron core materials for transformers, motors, generators, and other electronic equipment, taking advantage of the extremely excellent magnetic properties along the rolling direction. [0003] Recently, with the commercialization of grain-oriented electrical steel sheets with high magnetic flux density, materials with low iron loss are required. As methods for reducing iron loss, the following four technical methods are known. i), a method for accurately orienting the or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/02C22C38/06C22C38/04C22C38/00C22C38/60
CPCC22C38/00C22C38/02C22C38/04C22C38/06C22C38/60C21D8/0205C21D8/0226C21D8/0236C21D8/0257C21D8/0263C21D8/0273C21D8/1255C21D8/1283C22C38/001C23C8/10C23C8/80C21D9/46C21D6/008C21D8/005C21D8/1272C22C38/002C22C38/008
Inventor 韩敏洙朱炯暾朴钟皓朴昶洙洪炳得
Owner 浦项股份有限公司
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