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Method for manufacturing non-oriented electromagnetic steel sheet, and raw material hot rolling steel sheet

An electromagnetic steel plate, non-directional technology, applied in the direction of manufacturing tools, other manufacturing equipment/tools, etc., can solve problems such as increasing manufacturing costs

Active Publication Date: 2006-07-19
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, redundant processes such as lightly pressing hot-rolled steel sheets are required, which increases manufacturing costs.

Method used

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  • Method for manufacturing non-oriented electromagnetic steel sheet, and raw material hot rolling steel sheet
  • Method for manufacturing non-oriented electromagnetic steel sheet, and raw material hot rolling steel sheet
  • Method for manufacturing non-oriented electromagnetic steel sheet, and raw material hot rolling steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0166] The steel having the composition shown in Table 1 was smelted by converter blowing and degassing, and after continuous casting, the obtained slab was heated at 1200° C. for 1 hour, and then hot rolled to a thickness of 2.6 mm. The final temperature of hot rolling was 830°C, and the coiling temperature was 610°C.

[0167]then. After hot rolling and annealing under the conditions shown in Table 2, final cold rolling (25°C) or final warm rolling (50-350°C) to plate thickness: 0.5mm, decarburization annealing and final annealing are performed to obtain Non-oriented electrical steel sheet. Except for No. 44 (material containing excess S), the value of the parameter (P+100×S+300×Se) was 0.5 or less.

[0168] Table 2 shows the results of the examination of the magnetic properties of the electrical steel sheets thus obtained.

[0169] In addition, magnetic measurement was performed using the Epstein test piece of 25 cm. In addition, A in the table c3 The point is obtained ...

Embodiment 2

[0179] For the steel with the composition shown in Table 3, after hot rolling was carried out under the same conditions as in Example 1, the hot-rolled sheet was annealed under the conditions shown in Table 4, and then the final cold rolling (25° C.) or the final warm rolling was performed. (50-350° C.) to a plate thickness of 0.5 mm, decarburization annealing and final annealing are performed to become a non-oriented electrical steel sheet. The value of the parameter (P+100*S+300*Se) is 0.21.

[0180] The magnetic properties and A c3 Table 4 shows the results of the same examination as in Example 1.

[0181]

mark

Composition (mass%)

Ac 3 point

(℃)

C

Si

mn

P

S

Al

N

Sb

sn

Ni

co

Cr

Cu

A

0.0200

1.00

0.21

0.011

0.0020

tr

0.0020

tr

tr

tr

tr

tr

tr

104...

Embodiment 3

[0189] For the steel composed of the composition shown in Table 5, after hot rolling was carried out under the same conditions as in Example 1, the hot-rolled sheet was annealed under the conditions shown in Table 6, and then the final cold rolling (25° C.) or After final warm rolling (50 to 350° C.) to a plate thickness of 0.5 mm, decarburization annealing and final annealing were similarly performed under the conditions shown in Table 6 to obtain a non-oriented electrical steel sheet. In addition, the average cooling rate in the 800-500°C region of cooling after the hot-rolled sheet annealing was 60°C / s.

[0190] The magnetic properties and A c3 Table 6 shows the results of the same examination as in Example 1. In addition, after the magnetic measurement, the aging treatment was performed at 150° C. for 100 h, and then the magnetic measurement was performed again. The obtained measurement results are recorded in Table 6 together.

[0191]

steel mark

Comp...

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Abstract

The invention provides a non-oriented electromagnetic steel sheet having higher magnetic-flux density and lower core loss than ever. The steel material for the non-oriented electromagnetic steel sheet comprises, by mass%, 0.01-0.2% C, 3% or less Si, 0.05-3.0% Mn, 1% or less Al, 0.2% or less P, 0.01% or less S, 0.005% or less N, and the balance Fe with unavoidable impurities. The method for manufacturing the steel sheet includes a series of steps of: hot-rolling the above steel material; annealing the hot-rolled plate; rolling the plate into a final sheet thickness; and then decarburization-annealing and finish-annealing the sheet; wherein the hot-rolled plate is annealed in a temperature range of an Ac<SB>3< / SB>point or higher.

Description

technical field [0001] The present invention relates to an efficient method of manufacturing ideal non-oriented electrical steel sheets used as core materials such as electric motors and EI cores. Background technique [0002] In recent years, along with the increase in the demand for energy saving, the demand for high efficiency of electric motors has also increased. In order to increase the efficiency of electric motors, it is essential to improve the performance of electrical steel sheets used as core materials, so there is a strong demand for electrical steel sheets with higher magnetic flux density and lower iron loss than ever before. [0003] In order to increase the magnetic flux density of the electrical steel sheet, it is very effective to make the crystal grains coarse before cold rolling, so a technique of annealing the surface of the hot-rolled steel sheet is proposed (for example, Japanese Patent Publication No. 45-22211), and in High-temperature coiling after...

Claims

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Application Information

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IPC IPC(8): B23P23/04C21D8/12C22C38/06C22C38/60C22C38/52
CPCC21D1/26C21D6/005C21D6/008C21D8/12C21D8/1255C22C38/02C22C38/04C22C38/06
Inventor 尾田善彦河野正树早川康之河野雅昭大久保智幸
Owner JFE STEEL CORP
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