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Non-oriented electrical steel sheets with improved magnetic property and method for manufacturing the same

A technology of oriented electrical steel sheet and electrical steel sheet, applied in the field of non-oriented electrical steel sheet and its preparation, can solve the problems of increased production cost, unexplained relationship of other components, increased cost, etc., achieve excellent non-oriented, suppress the formation of CuS, The effect of improving magnetic properties

Active Publication Date: 2011-01-12
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, there is a problem in that in the former, the manufacturing cost increases due to an additional process in the process of preparing pure steel, and in the latter, the cost of other elements increases due to the addition of other elements
In this patent, although the amount of impurities is reduced and other elements are added, the relationship between other components and the production process conditions is not explained

Method used

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  • Non-oriented electrical steel sheets with improved magnetic property and method for manufacturing the same
  • Non-oriented electrical steel sheets with improved magnetic property and method for manufacturing the same
  • Non-oriented electrical steel sheets with improved magnetic property and method for manufacturing the same

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Experimental program
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Effect test

preparation example Construction

[0040] Furthermore, to achieve the object, the present invention provides a non-oriented electrical steel sheet with excellent magnetic properties obtained by a preparation method comprising the steps of hot rolling a steel ingot containing 0.004 wt. % or less of C; 1.0 to 3.5wt.% of Si; 0.02wt.% or less of P; 0.001wt.% or less of S; 0.2 to 2.5wt.% of Al; Less N; 0.004wt.% or less Ti; Mn, wherein the amount of Mn is represented by the above formula (1); the balance is iron; and unavoidable impurities; ) within a determined temperature range, the annealing temperature of the hot-rolled steel sheet depends on the amount of S in the continuous annealing stage; the annealed steel sheet is cold-rolled; and the cold-rolled steel sheet is annealed to obtain the steel sheet of the present invention.

[0041] In this case, S precipitates as MnS, and thus leads to fine crystal grains. The amount of S must be small, if possible, due to the ease of formation of such a texture with planes...

Embodiment 1

[0091] Steel ingots composed of the compositions in Table 1 were reheated to a temperature of 1100°C, and were subjected to final rolling in a hot rolling process at a temperature of 860°C.

[0092] In this case, the final reduction ratio during finish rolling was 18%. The steel ingot was rolled to a thickness of 1.8 mm and then coiled at a temperature of 650°C.

[0093] The hot-rolled steel sheets were coiled and cooled at ambient conditions, annealed, pickled, and cold-rolled to a thickness of 0.35 mm as shown in Table 2 to form cold-rolled steel sheets. The cold-rolled steel sheet was then annealed at an annealing temperature of 1050°C for 1 minute in an atmosphere of 35% hydrogen and 65% nitrogen.

[0094] After cutting the annealed steel plate, compare the magnetic properties and the texture coefficient obtained according to the Horta formula. The results are given in Table 2.

[0095] [Table 1]

[0096]

[0097] [Table 2]

[0098]

[0099]

[0100] 1) Iron co...

Embodiment 2

[0107] A steel ingot containing 0.0021wt.%C; 2.52wt.%Si; 0.011wt.%P; 0.0005wt.%S; 0.55wt.%Al; 0.0012wt.%N; Mn, wherein the preferred amount of Mn is 0.15-0.31%; the balance is iron; and unavoidable impurities. The ingot was reheated to a temperature of 1150° C. and then hot rolled. In the hot rolling stage, final rolling in finish rolling was performed at a temperature of 880° C. to have a reduction ratio of 17%, thereby obtaining a hot-rolled steel sheet having a thickness of 2.2 mm.

[0108] This hot-rolled steel sheet was coiled at a temperature of 600° C., and then air-cooled. Next, this hot-rolled steel sheet was continuously annealed at a temperature of 920° C. for 5 minutes, acid-stained, and then cold-rolled to a thickness of 0.5 mm.

[0109] In this case, the suitable temperature range during the annealing of the hot-rolled steel sheet is in the range of 854-979°C, and the annealing process of the cold-rolled steel sheet is performed at a temperature of 1000°C for 1...

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Abstract

The present invention relates to a non-oriented electrical steel sheet, widely used as an iron core in electric devices, and to a method of manufacturing the same. The non-oriented electrical sheet includes 0.004 wt. % or less C; 1.0-3.5 wt. % Si; 0.02 wt. % or l ess P ; 0.001 wt. % or less S ; 0.2-2.5 wt. % Al; 0.003 wt. % or less N; 0.004 wt. % or less Ti; Mn, in which the amount of thereof is represented by the following formula (1): 0.10+100 X S(wt. %) = Mn(wt. %) = 0.21+200 X S(wt. %) - (1); a balance of iron; and inevitable impurities. According to the present invention, final magnetic properties are greatly improved because fine precipitates are formed by S, the amount of Mn can be suitably determined in order to inhibit the formation of the fine precipitates, the formation of fineprecipitate CuS is inhibited because precipitates CuS, MnS are formed by adding Sn, Ni and Cu, and a texture, which determines a temperature of annealing a hot rolled steel plate and magnetic properties, is controlled, thereby manufacturing an inexpensive and optimum non-oriented electrical steel sheet.

Description

technical field [0001] The present invention relates to a non-oriented electrical steel sheet widely used as iron cores in electric equipment such as motors, transformers, etc., and to a production method thereof, and, more particularly, to a steel sheet in which iron loss is reduced and magnetic flux density is increased A non-oriented electrical steel sheet with excellent magnetic properties and a preparation method thereof. Background technique [0002] In general, non-oriented electrical steel sheets are important components necessary to convert electrical energy into mechanical energy in electrical equipment. In order to reduce energy consumption, it is necessary to reduce iron loss and increase magnetic flux density. Specifically, when the magnetic flux density is increased, power loss in electric equipment can be reduced, so that electric equipment can be miniaturized. [0003] Such non-oriented electrical steel sheets are used as iron core materials in rotating equ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00
CPCC21D8/1222C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 裴秉根金在宽
Owner 浦项股份有限公司
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