Non-oriented electrical steel sheet having superior magnetic properties and a production method therefor

A technology of oriented electrical steel sheet and magnetism, applied in the direction of magnetism of inorganic materials, can solve the problems of hindering domain wall migration, hindering grain growth, increasing hysteresis loss, etc., to achieve excellent magnetism, lower manufacturing unit price, and lower costs.

Active Publication Date: 2013-01-30
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

[0006] Precipitated inclusions in typical non-oriented electrical steel sheets include MnS and AlN, which are observed to have a tiny average size of about 50 nm, and such fine inclusions hinder grain growth during annealing to increase hysteresis loss and Impedes migration of domain walls upon magnetization, thereby reducing permeability

Method used

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  • Non-oriented electrical steel sheet having superior magnetic properties and a production method therefor
  • Non-oriented electrical steel sheet having superior magnetic properties and a production method therefor
  • Non-oriented electrical steel sheet having superior magnetic properties and a production method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0103] Vacuum melting was carried out in a laboratory to prepare steel ingots having the composition shown in Table 1 below. To this end, the content of the impurity elements C, S, N, and Ti of the raw materials is controlled at 0.002%, and 0.3~0.5% of Al is added to the molten steel to promote the formation of inclusions, and then the remaining Al and Si are added and Mn to produce steel ingots. Each ingot was heated to 1,150° C., and subjected to final hot rolling at 850° C. to manufacture a hot-rolled sheet having a thickness of 2.0 mm. The hot-rolled hot-rolled sheet was annealed at 1,050° C. for 4 minutes and then pickled. Subsequently, cold rolling was performed so that the thickness of the sheet material was formed to be 0.35 mm, followed by final annealing at 1,050° C. for 38 seconds.

[0104] The size and distribution density of inclusions, iron loss, magnetic flux density, and hardness of each sheet were measured. The results thereof are shown in Table 2 below. A...

Embodiment 2

[0113] Vacuum melting was carried out in a laboratory, thereby preparing steel ingots having the compositions shown in Table 3 below. To this end, the composition of the steel is controlled while the amounts of impurity elements N and S are adjusted differently, and 0.3-0.5% of Al is added to the molten steel to promote the formation of inclusions, and then the remaining Al and Si and Mn are added Thereby producing steel ingots. Each ingot was heated to 1,150° C., and subjected to final hot rolling at 850° C. to manufacture a hot-rolled sheet having a thickness of 2.0 mm. The hot-rolled hot-rolled sheet was annealed at 1,050° C. for 4 minutes and then pickled. Subsequently, cold rolling was performed so that the thickness of the sheet material was formed to be 0.35 mm, followed by final annealing at 1,050° C. for 38 seconds.

[0114] The size and distribution density of inclusions, iron loss, magnetic flux density, and hardness of each sheet were measured. The results there...

Embodiment 3

[0123] Vacuum melting was carried out in a laboratory to prepare steel ingots having the composition shown in Table 5 below. For this, 0.3~0.5% of Al is added to molten steel to promote the formation of inclusions, and thereafter the remaining Al and Si, Mn, and P are added to manufacture a steel ingot. Each ingot was heated to 1,150° C., and subjected to final hot rolling at 850° C. to manufacture a hot-rolled sheet having a thickness of 2.0 mm. The hot-rolled hot-rolled sheet was annealed at 1,050° C. for 4 minutes and then pickled. Subsequently, cold rolling was performed to form sheets having various thicknesses of 0.15˜0.35 mm, followed by final annealing at 1,050° C. for 38 seconds. Measure the iron loss and magnetic flux density of each sheet of different thickness. The results thereof are shown in Table 6 below. A sample for observation of inclusions was produced using a replica method commonly used in the steel industry, and a transmission electron microscope was u...

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Abstract

The present invention relates to a non-oriented electrical steel sheet. Provided are: a non-oriented electrical steel sheet having outstanding magnetic properties and comprising, as percentages by weight, from 1.0 to 3.0% of Al, from 0.5 to 2.5% of Si, from 0.5 to 2.0% of Mn, from 0.001 to 0.004% of N, from 0.0005 to 0.004% of S and a balance of Fe and other unavoidably incorporated impurities, wherein the Al, Mn, N and S are included so as to satisfy the compositional formulae {[Al]+[Mn]}=3.5, 0.002={[N]+[S]}=0.006, 300={([Al]+[Mn]) / ([N]+[S])}=1,400; and a production method therefor. By optimising the Al, Si, Mn, N and S added components in this way, the distribution density of coarse inclusions is increased, thereby making it possible to improve crystal-grain growth properties and domain wall motility and so produce the highest grade of non-oriented electrical steel sheet having superior magnetic properties, low hardness, and superior customer workability and productivity.

Description

technical field [0001] The present invention relates to the preparation of a non-oriented electrical steel sheet, and in particular to a non-oriented electrical steel sheet of the highest quality, wherein the additive components of the steel are optimally set to increase the concentration of coarse inclusions in the steel Distributing density and improving the growth of crystal grains and the mobility of domain walls, making the magnetic properties stronger and ensuring low hardness, thereby improving the productivity and punchability of products, also relates to its preparation method. Background technique [0002] The present invention relates to the preparation of a non-oriented electrical steel sheet used as an iron core material for a rotating device. This non-oriented electrical steel sheet is critical in converting electrical energy into mechanical energy, so its magnetic properties are considered important. Magnetic properties mainly include core loss and magnetic f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/12
CPCC22C38/14C22C38/004C22C38/002C22C38/02C22C38/008C22C38/06C22C38/04C21D2211/004C21D8/12C22C38/001C22C38/60H01F1/16
Inventor 金载勋金在宽金龙洙奉元奭
Owner 浦项股份有限公司
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