Unlock instant, AI-driven research and patent intelligence for your innovation.

Method of producing non-oriented electrical steel sheet

a technology of non-oriented steel and electrical steel, applied in the field of non-oriented steel sheet production, can solve the problem of high production cost, achieve excellent magnetic property, improve the efficiency of motor or transformer, and excellent magnetic property

Inactive Publication Date: 2013-06-13
JFE STEEL CORP
View PDF7 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides non-oriented electrical steel sheets with excellent magnetic properties in the rolling direction. This results in better efficiency when used in applications such as motor or transformer cores, which require excellent magnetic properties.

Problems solved by technology

However, the grain oriented electrical steel sheet is produced through a secondary recrystallization process, so that the production cost is high and the sheet is not substantially used as the segment core actually.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of producing non-oriented electrical steel sheet

Examples

Experimental program
Comparison scheme
Effect test

examples

[0054]Each of steels Nos. 1-29 having an element composition shown in Table 1 is melted by a usually well-known refining process and continuously cast into a raw steel material (slab), and the slab is heated at 1080° C. for 30 minutes and then hot rolled to form a hot rolled sheet having a thickness of 2.4 mm Then, the hot rolled sheet is subjected to an annealing at 900° C. for 30 seconds and to a single cold rolling to form a cold rolled sheet having a final thickness of 0.35 mm. Thereafter, the cold rolled sheet is heated at various temperature rising rates of not less than 30° C. / sec in a direct power heating furnace and soaked at a temperature shown in Table 1 for 10 seconds to conduct finish annealing, and then subjected to decarburization annealing of 850° C.×30 seconds (dew point: 30° C.) to prepare a non-oriented electrical steel sheet.

[0055]Next, a L-direction test specimen of L: 180 mm×C: 30 mm is cut out from each of the thus obtained non-oriented electrical steel sheets...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
temperatureaaaaaaaaaa
average crystal grain sizeaaaaaaaaaa
crystal grain sizeaaaaaaaaaa
Login to View More

Abstract

Disclosed is a method for producing a non-oriented magnetic steel sheet, wherein a steel slab that consists of 0.01-0.1 mass % of C, 4 mass % or less of Si, 0.05-3 mass % of Mn, 3 mass % or less of Al, 0.005 mass % or less of S, 0.005 mass % or less of N and the balance made up of Fe and unavoidable impurities is subjected to hot rolling, cold rolling and final annealing. By carrying out the final annealing, while setting the average heating rate during the heating to 100° C. / sec or more and setting the soaking temperature within the temperature range of 750-1100° C., a non-oriented magnetic steel sheet that has extremely increased magnetic flux density in the rolling direction of the steel sheet is advantageously produced.

Description

TECHNICAL FIELD[0001]This invention relates to a method of producing a non-oriented electrical steel sheet, and more particularly to a method of producing a non-oriented electrical steel sheet with an excellent magnetic flux density in a rolling direction of the steel sheet.RELATED ART[0002]Recently, it is strongly required to render electric equipments into higher efficiency and downsizing in universal current of reducing energy inclusive of power. As a result, even in non-oriented electrical steel sheets widely used as a core material or the like of the electric equipment, it becomes an essential agenda to improve magnetic property or to attain a higher magnetic flux density and a lower iron loss for achieving the downsizing and high efficiency of the electric equipment.[0003]For such requirements on the non-oriented electrical steel sheet, it has hitherto been attempted to make the magnetic flux density higher by selecting appropriate alloying elements to be added and further inc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): C21D8/02
CPCC21D8/12C21D8/1244C21D8/1255C22C1/02C22C38/00C21D8/0205C21D2201/05C21D8/1272C22C38/02C22C38/04C22C38/06
Inventor ZAIZEN, YOSHIAKIODA, YOSHIHIKOKOHNO, MASAAKI
Owner JFE STEEL CORP