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Method for producing non-oriented electrical steel sheet

A technology of electromagnetic steel sheet and manufacturing method, applied in the direction of manufacturing tools, inorganic material magnetism, circuits, etc., can solve problems such as increased copper loss, reduced magnetic flux density, and reduced motor torque

Active Publication Date: 2021-11-30
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of a large amount of Si and Al will reduce the magnetic flux density, which will cause new problems such as a decrease in the torque of the motor and an increase in copper loss.

Method used

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  • Method for producing non-oriented electrical steel sheet
  • Method for producing non-oriented electrical steel sheet
  • Method for producing non-oriented electrical steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Steel with the following composition is melted to form a steel slab, and after reheating at 1100°C for 30 minutes, it is hot-rolled to form a hot-rolled sheet with a thickness of 1.6mm. After soaking for 60 seconds, the hot-rolled sheet is annealed at 25°C / sec, pickled to remove scale, and cold-rolled to form a cold-rolled sheet with a final thickness of 0.18 mm. The composition contains C : 0.0015% by mass, Si: 3.2% by mass, Mn: 0.18% by mass, P: 0.07% by mass, S: 0.0015% by mass, sol.Al: 0.0008% by mass, and N: 0.0018% by mass. The composition shown in 4 contains Sn, Sb, REM, Mg, and Ca, and the remainder is composed of Fe and unavoidable impurities. At this time, the distribution of rolling oil and rolling reduction ratio in the above-mentioned cold rolling was the conditions shown in Table 5. Next, the cold-rolled sheet was subjected to finish annealing at 1000° C. for 10 seconds in a dry nitrogen-hydrogen atmosphere, and then an insulating coating was applied to f...

Embodiment 2

[0082] For those containing C: 0.0015% by mass, Si: 3.2% by mass, Mn: 0.18% by mass, P: 0.07% by mass, S: 0.0015% by mass, sol.Al: 0.0008% by mass, N: 0.0018% by mass and Sn: 0.06 % by mass, and the remainder is composed of Fe and unavoidable impurities, reheated at 1100°C for 30 minutes, hot-rolled to form a hot-rolled sheet with a thickness of 1.6mm, and carried out in a continuous annealing furnace at 1050°C×30 minutes. After soaking for 60 seconds, the hot-rolled sheet was annealed with cooling at 25°C / sec, pickled to remove scale, and then cold-rolled using a four-stand tandem rolling mill to obtain a final sheet thickness of 0.18. mm cold-rolled plate. Here, in the above-mentioned cold rolling, the kinematic viscosity v of the rolling oil supplied to each stand was adjusted so that the friction coefficients of No. 1 to No. 4 stands became the values ​​shown in Table 6. 50 , and the reduction rate of each rack is distributed in the same manner as shown in Table 6. Next,...

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Abstract

Provided is a method for producing a non-oriented electrical steel sheet which is used as an iron core material for a motor, a transformer, and the like, and has excellent magnetic properties, the method comprising: hot-rolling a steel material which contains at most 0.005 mass% of C, 1.0-5.0 mass% of Si, 0.04-3.0 mass% of Mn, at most 0.005 mass% of sol. Al, at most 0.2 mass% of P, at most 0.005 mass% of S, and at most 0.005 mass% of N, with the balance being Fe and inevitable impurities, to obtain a hot-rolled sheet; thermally annealing the hot-rolled sheet; then performing at least two cold rolling processes, between which one cold rolling or intermediate annealing is performed, to obtain a cold-rolled sheet having a final thickness; and performing finish annealing, wherein at least one pass in the final cold rolling of the cold rolling processes is a rolling having a friction coefficient [mu]m of at least 0.030 and a rolling reduction of at least 15%.

Description

technical field [0001] The present invention relates to a method for manufacturing a non-oriented electrical steel sheet excellent in magnetic properties used as core materials for motors and transformers. Background technique [0002] A non-oriented electrical steel sheet is a soft magnetic material widely used as a core material for motors and transformers. In recent years, due to increasing demand for energy saving, there has been a strong demand for a non-oriented electrical steel sheet that has lower iron loss and higher magnetic flux density. [0003] In order to reduce iron loss, it is effective to increase the content of Si, Al, etc., which increase the electrical resistance of steel. If the resistance increases, the eddy current loss due to the magnetization of the steel sheet decreases. However, a large amount of addition of Si and Al leads to a decrease in magnetic flux density, which causes new problems such as a decrease in the torque of the motor and an incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B3/02C21D8/12C22C38/00C22C38/06C22C38/60B21B1/22H01F1/147
CPCC22C38/60C22C38/004C22C38/02C22C38/04C22C38/008C22C38/005C22C38/002C21D6/008C21D9/46C21D8/1233C21D8/1266C21D8/1272H01F1/16H01F1/14775C22C38/06C22C38/001C21D8/1222C21D8/1261
Inventor 下山祐介新垣之启财前善彰山口广
Owner JFE STEEL CORP