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Grain-oriented electrical steel sheet and manufacturing method thereof

A technology of grain-oriented electrical steel sheet and manufacturing method, applied in manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of coil annealing, coil temperature deviation, etc.

Active Publication Date: 2021-05-14
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

However, coil annealing is required due to high temperature heat treatment, and temperature deviation occurs on the coil when the temperature is raised
At this time, when the moisture contained in the annealing separator gradually becomes high temperature, it will have different effects on each position of the coil, so the surface oxide layer at each position will be affected differently, the formation of the base covering layer or the base covering The peeling of the layers is affected differently, so even if a good mirror-forming condition based on the additives in the annealing separator is found, it is difficult to make all positions on the coil under the same conditions, so there are difficulties in principle and structure. The problem of uniform mirror finishing of the entire coil

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

Embodiment 1

[0087] Steel slabs containing 3.2% by weight of Si, 0.052% of C, additionally added In as organized in Table 1 below, and the remainder including Fe and other unavoidable impurities were produced. The steel billet was hot-rolled to produce a 2.6 mm hot-rolled sheet, and then the hot-rolled sheet was annealed and pickled, and then cold-rolled to a final thickness of 0.3 mm.

[0088] After raising the temperature of the cold-rolled sheet, keep the temperature at 850°C for 120 seconds in a mixed gas atmosphere with a dew point temperature of 63 to 67°C formed by adding 50% by volume of hydrogen and 50% by volume of nitrogen at the same time, and implement decarburization and nitriding at the same time. Treated so that carbon becomes 30 ppm or less and nitrogen becomes 300 ppm.

[0089] On this steel sheet, MgO was coated as an annealing separator, and secondary recrystallization annealing was performed. MgO was applied in a slurry state mixed with water, and no other additives w...

Embodiment 2

[0095] A slab of grain-oriented electrical steel sheet was prepared, which contained 3.0% of Si, 0.051% of C, 0.09% of Mn, 0.029% of Al, 0.0040% of N and 0.005% of S in % by weight, as shown in Table 2. Indium (In) and Sb changed as described above, the remaining components including Fe and other impurities that are inevitably mixed. The slab was heated at 1150°C for 90 minutes, then hot-rolled, then rapidly cooled to 580°C, annealed at 580°C for 1 hour for furnace cooling, and hot-rolled to produce a 2.3mm-thick hot-rolled sheet.

[0096] After heating this hot-rolled sheet at a temperature of 1,050° C. or higher, it was kept at 910° C. for 80 seconds, rapidly cooled with boiling water, and then pickled. Next, cold rolling was performed to obtain a thickness of 0.30 mm. After raising the temperature of the cold-rolled sheet, keep the temperature at 850°C for 120 seconds in a mixed gas atmosphere with a dew point temperature of 63 to 67°C formed by adding 50% by volume of hyd...

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Abstract

The grain-oriented electrical steel sheet of one embodiment of the present invention contains, in weight %: 1.0% to 7.0% of Si; 0.005% or less (excluding 0%) of C; 0.001% to 0.5% of In; and Fe and others The remainder of the unavoidable inclusion of impurities.

Description

technical field [0001] The present invention relates to oriented electrical steel sheet and its manufacturing method. In particular, it relates to a grain-oriented electrical steel sheet including mirror-finishing elements and a method of manufacturing the same. Background technique [0002] The grain-oriented electrical steel sheet refers to a steel sheet containing a Si component, which has an aggregate structure in which the orientation of crystal grains is aligned in the 100}<001> direction. Grain-oriented electrical steel sheets are mainly used as iron core materials for transformers, motors, generators, and other electronic equipment, which utilize extremely excellent magnetic properties along the rolling direction. [0003] Recently, with the commercialization of grain-oriented electrical steel sheets with high magnetic flux density, there is an increasing demand for materials with low iron loss. As methods for reducing iron loss, the following four technical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/00C22C38/04C22C38/06C22C38/60C22C38/34C21D8/12
CPCC21D8/12C22C38/02C22C38/04C22C38/06C22C38/34C22C38/60C22C38/004C22C38/005C21D8/1222C21D8/1233C21D8/1272C21D8/1283C22C38/001C22C38/002C21D8/1205C21D9/46C22C38/008C22C38/18
Inventor 朱炯暾韩敏洙朴炯基李相雨徐进旭
Owner 浦项股份有限公司
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