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High-strength non-oriented magnetic steel sheet and process for producing the high-strength non-oriented magnetic steel sheet

A non-oriented, electromagnetic steel plate technology, applied in the direction of manufacturing tools, inorganic material magnetism, circuits, etc., can solve the problems of heat treatment conditions, inability to obtain strength and magnetic properties, etc.

Active Publication Date: 2011-04-06
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the manufacture of this non-oriented electrical steel sheet, heat treatment conditions are restricted.
Therefore, the required strength and magnetic properties cannot be obtained

Method used

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  • High-strength non-oriented magnetic steel sheet and process for producing the high-strength non-oriented magnetic steel sheet
  • High-strength non-oriented magnetic steel sheet and process for producing the high-strength non-oriented magnetic steel sheet
  • High-strength non-oriented magnetic steel sheet and process for producing the high-strength non-oriented magnetic steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0150] Steels containing Si: 2.9%, Mn: 0.2%, Al: 0.7%, and Cu: 1.5% in mass % and different mass % of C, N, Nb, Zr, Ti, and V were produced in a vacuum melting furnace. After heating at 1150° C. for 60 minutes, hot rolling was performed immediately to obtain a hot-rolled sheet having a thickness of 2.3 mm. Then, the hot-rolled sheet was pickled and cold-rolled once to obtain a cold-rolled sheet having a thickness of 0.5 mm. The cold-rolled sheet was subjected to final annealing at 900° C. for 60 seconds. Table 5 shows the measurement results of components and properties.

[0151]

[0152] In the symbol a1 that does not satisfy equation (1), the yield stress and eddy current loss We 10 / 400 beyond the scope of the present invention. In addition, in symbols a14 to a17 that do not satisfy the formula (2), the recrystallization ratio and the elongation at break are out of the range specified in the present invention. The C content exceeds the upper limit of the range specifi...

Embodiment 2

[0154] Steels containing Si: 3.7%, Mn: 0.1%, Al: 0.2%, and Cu: 1.4% in mass % and different mass % of C, N, Nb, Zr, Ti, and V were produced in a vacuum melting furnace. After heating at 1150° C. for 60 minutes, hot rolling was performed immediately to obtain a hot-rolled sheet having a thickness of 2.3 mm. Then, the hot-rolled sheet was pickled and cold-rolled once to obtain a cold-rolled sheet having a thickness of 0.5 mm. The cold-rolled sheet was subjected to final annealing at 900° C. for 60 seconds. Table 6 shows the measurement results of components and properties.

[0155]

[0156] In the symbol b1 that does not satisfy equation (1), the yield stress and eddy current loss We 10 / 400 beyond the scope of the present invention. In addition, in symbols b14 to b17 that do not satisfy the formula (2), the recrystallization ratio and the elongation at break are out of the range specified in the present invention. Likewise, in the symbol b20 that does not satisfy the form...

Embodiment 3

[0158] Produced in a vacuum melting furnace containing C: 0.022%, Mn: 0.5%, Al: 2.0%, N: 0.003%, Ni: 1.0%, Nb: 0.031%, Zr: 0.004%, Ti: 0.003% and V: 0.004%, and the steel in which the Si content and the Cu content were changed was heated at 1120° C. for 120 minutes, and then hot-rolled immediately to obtain a hot-rolled sheet having a thickness of 2.0 mm. Then, the hot-rolled sheet was pickled and cold-rolled once to obtain a cold-rolled sheet having a thickness of 0.25 mm. The cold-rolled sheet was subjected to final annealing at 1000° C. for 45 seconds. Table 7 shows the measurement results of the amount of Si, the amount of Cu, and various properties.

[0159] Table 7

[0160]

[0161] *2: According to formula (3), We10 / 400≤4.4W / kg when the plate thickness is 0.25mm

[0162] In the samples (symbols c1 to c5) in which the Si content is 1.8% lower than the range specified in the present invention, the yield stress and eddy current loss We 10 / 400 beyond the scope of the...

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Abstract

Disclosed is a high-strength non-oriented magnetic steel sheet, comprising by mass C: 0.002% or more and 0.05% or less, Si: 2.0% or more and 4.0% or less, Mn: 0.05% or more and 1.0% or less, N: 0.002% or more and 0.05% or less, and Cu: 0.5% or more and 3.0% or less. Al content is 3.0% or less. The following formulae (1) and (2) are satisfied. In formulae (1) and (2), [Nb] represents Nb content, %; [Zr] represents Zr content, %; [Ti] represents Ti content, %; [V] represents V content, %; [C] represents C content, %; and [N] represents N content, %. The balance consists of Fe and unavoidable impurities. The percentage area of recrystallized crystals is 50% or more. The yield strength in a tensile test is 700 MPa or more. The break elongation is 10% or more. The eddy-current loss We10 / 400 (W / kg) satisfies formula (3) in relation with the thickness t (mm) of the steel sheet. 2.0 * 10<-4> <= [Nb] / 93 + [Zr] / 91 + [Ti] / 48 + [V] / 51 (1) 1.0 * 10<-3> <= [C] / 12 + [N] / 14 - ([Nb] / 93 + [Zr] / 91 + [Ti] / 48 + [V] / 51) <= 3.0 * 10<-3> (2) We10 / 400 <= 70 * t2 (3).

Description

technical field [0001] The present invention relates to a high-strength non-oriented electrical steel sheet suitable for use as an iron core material for motors for electric vehicles and motors for electrical appliances, and a method for producing the same. Background technique [0002] In recent years, due to the increase in energy saving of electrical equipment worldwide, higher performance characteristics have been required for non-oriented electrical steel sheets used as iron core materials for rotating machines. Especially recently, as a motor used in an electric vehicle and the like, the demand for a small-sized high-power motor is increasing. Such motors for electric vehicles have been designed so that high torque can be obtained by rotating them at high speed. [0003] High-speed rotary motors have also been used in electrical equipment such as machine tools and cleaning machines. However, the outer shape of the high-speed rotary motor for electric vehicles is larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/12C21D9/46C22C38/16H01F1/16
CPCC21D2211/004H01F1/147C22C38/14C21D8/1222H01F1/16C22C38/02C22C38/12C21D8/1272C22C38/001C22C38/002C22C38/004C22C38/008C22C38/04C22C38/06C22C38/08C22C38/16C21D2201/05
Inventor 有田吉宏村上英邦牛神义行久保田猛
Owner NIPPON STEEL CORP