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Method for preparing low-grade non-oriented electrical steel processed by rare earth

A technology of grain-oriented electrical steel and low grade, applied in the field of metallurgical materials and electrical steel, can solve the problems of increasing production costs and increasing production costs, and achieve the effects of reducing production costs, low silicon content, and excellent magnetic properties

Inactive Publication Date: 2012-02-08
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, 0.015 to 0.12% of Sn and Sb alloy elements are added, which increases the production cost
3. Chinese patents 200310108197.2 and 200510027404.0 both disclose a method for producing cold-rolled non-oriented electrical steel with low iron loss and high magnetic induction, which is characterized in that other alloy elements are added to the composition, which increases the production cost

Method used

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  • Method for preparing low-grade non-oriented electrical steel processed by rare earth
  • Method for preparing low-grade non-oriented electrical steel processed by rare earth
  • Method for preparing low-grade non-oriented electrical steel processed by rare earth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The chemical composition of the continuous casting slab is as follows:

[0015] Table 1 Chemical Composition of Continuous Casting Slab Unit: %

[0016] Program

C

Si

mn

P

S

Al

O

N

RE

1

0.0020

0.70

0.35

0.060

0.002

0.36

0.0016

0.0036

0.0016

[0017] The thickness of the hot-rolled steel strip is 2.5mm. The air-cooled hot-rolled steel strip is pickled and then cold-rolled. After continuous cold rolling, the reduction rate is 3.0-36.0%. The protective gas of the cold-rolled steel coil is 80% nitrogen and 20% hydrogen two-stage annealing furnace annealing, the annealing temperature is 850 ~ 1000 ℃, to obtain the required electromagnetic properties and texture. The annealed steel coil is coated with a semi-organic coating to ensure the insulation and interlayer resistance of the punched steel plate.

[0018] Table 2 Iron loss value and magnetic pr...

Embodiment 2

[0021] The chemical composition of the continuous casting slab is as follows:

[0022] Table 2 Chemical Composition of Continuous Casting Slab Unit: %

[0023] Program

C

Si

mn

P

S

Al

O

N

RE

2

0.0020

0.55

0.37

0.062

0.002

0.33

0.0018

0.0034

0.0015

[0024] The thickness of the hot-rolled steel strip is 2.5mm. The air-cooled hot-rolled steel strip is pickled and then cold-rolled. After continuous cold rolling, the reduction rate is 3.0-36.0%. The protective gas of the cold-rolled steel coil is 80% nitrogen and 20% hydrogen two-stage annealing furnace annealing, the annealing temperature is 850 ~ 1000 ℃, to obtain the required electromagnetic properties and texture. The annealed steel coil is coated with a semi-organic coating to ensure the insulation and interlayer resistance of the punched steel plate.

[0025] Table 3 Iron loss value and magnetic pr...

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Abstract

The invention relates to a method for preparing low-grade non-oriented electrical steel processed by rare earth and belongs to the field of electrical sheet. The low-grade non-oriented electrical steel with excellent magnetic properties is finally obtained by using short-process continuously cast blooms as raw materials through the steps of hot rolling, cold rolling and annealing. The design requirement of 0.001 to 0.005 percent of C, 0.5 to 1.0 percent of Si, 0.25 to 0.50 percent of Mn, less than or equal to 0.080 percent of P, less than or equal to 0.005 percent of S, 0.25 to 0.50 percent of Al, 0.0014 to 0.020 percent of RE (Ce) and the balances of iron and unavoidable impurities on ingredients of the hot rolling raw materials is met. The product has the final magnetic properties that when the thickness of a steel plate is 5mm, P15 / 50 is in the range of 3.45 to 5.02W / Kg and B5000 is in the range of 1.67 to 1.75T. The low-grade non-oriented electrical steel processed by the rare earth has the advantages that compared with the prior art, the low-grade non-oriented electrical steel has low silicon content and low O content and N content and excellent magnetic properties; and the production cost is reduced.

Description

Technical field: [0001] The invention relates to a method for preparing rare earth-treated low-grade non-oriented electrical steel, which belongs to the technical field of metallurgical materials, in particular to the field of electrical steel. The electrical steel has excellent magnetic properties. Background technique: [0002] The main purpose of cold-rolled non-oriented silicon steel sheet is for the manufacture of generators, so it is also called cold-rolled electrical silicon steel. Its silicon content is 0.5wt% to 3.0wt%, and it is cold rolled to the thickness of the finished product, and the steel strip with a thickness of 0.35mm and 0.5mm is mostly supplied. In the steel plate after deformation and annealing, the grains are distributed in random orientation. With the development of various micro motors and compressors towards high efficiency and miniaturization, and the improvement of large-scale annealing equipment for motor and compressor users, cold-rolled non-o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D8/12C22C38/06
Inventor 黄利程德富张秀飞白雅琼王荣刘海涛张晓燕冯岩青
Owner INNER MONGOLIA BAOTOU STEEL UNION
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