Preparation method of low carbon low silicon no-aluminum half-technique non oriented electrical steel

A technology of oriented electrical steel, low-carbon and low-silicon, applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems of increasing production costs, and achieve the goals of reduced production costs, excellent magnetic properties of finished products, and optimized annealing process Effect

Active Publication Date: 2008-11-19
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 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
Adding alloying elements and adopting normalization process both greatly increase the production cost

Method used

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  • Preparation method of low carbon low silicon no-aluminum half-technique non oriented electrical steel
  • Preparation method of low carbon low silicon no-aluminum half-technique non oriented electrical steel
  • Preparation method of low carbon low silicon no-aluminum half-technique non oriented electrical steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The chemical composition (%) of steel A continuous casting slab is shown in Table 1.

[0017] Table 1 Chemical composition (%) of continuous casting slab of steel A

[0018] Sample No.

C

Si

mn

P

S

N

O

the remaining

A

0.002

1.03

0.26

＜0.005

0.006

0.0046

0.01

Fe and unavoidable impurities

[0019] The thickness of the hot-rolled steel strip is 2.3mm. The air-cooled hot-rolled steel strip is pickled and then cold-rolled. After intermediate annealing at 650-800°C for 1-2min, the annealing atmosphere is required to be 30%H 2 +70%N 2 Mixed gas does not require humidification and decarburization, and it is necessary to ensure that the crystallization rate after intermediate annealing is ≥ 40%. Then undergo critical deformation cold rolling with a reduction rate of 4.4-13.2%, and the hardness of the steel plate after critical deformation cold-rolling is 130-180HV. ...

Embodiment 2

[0024] The chemical composition (%) of steel B continuous casting slab is shown in Table 3.

[0025] Table 3 Chemical composition (%) of steel B continuous casting slab

[0026] Sample No.

C

Si

mn

P

S

N

O

the remaining

B

0.002

0.45

0.29

0.062

0.005

0.0039

0.012

Fe and unavoidable impurities

[0027] The thickness of the hot-rolled steel strip is 2.3mm. The air-cooled hot-rolled steel strip is pickled and then cold-rolled. After intermediate annealing at 650-800°C for 1-2min, the annealing atmosphere is required to be 30%H 2 +70%N 2 Mixed gas does not require humidification and decarburization, and it is necessary to ensure that the crystallization rate after intermediate annealing is ≥ 40%. Then undergo critical deformation cold rolling with a reduction rate of 3.1-8.4%, and the hardness of the steel plate after critical deformation col...

Embodiment 3

[0031] The chemical composition (%) of steel C continuous casting slab is shown in Table 5.

[0032] Table 5 Chemical composition (%) of steel C continuous casting slab

[0033] Sample No.

C

Si

mn

P

S

N

O

the remaining

C

0.002

0.74

0.28

0.065

0.006

0.0033

0.012

Fe and unavoidable impurities

[0034] The thickness of the hot-rolled steel strip is 2.3mm. The air-cooled hot-rolled steel strip is pickled and then cold-rolled. After intermediate annealing at 650-800°C for 1-2min, the annealing atmosphere is required to be 30%H 2 +70%N 2 Mixed gas does not require humidification and decarburization, and it is necessary to ensure that the crystallization rate after intermediate annealing is ≥ 40%. Then undergo critical deformation cold rolling with a reduction rate of 3.7-10.7%, and the hardness of the steel plate after critical deformation cold rolling is 130-180HV. A...

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Abstract

A method for preparing low-carbon low-silicon non-aluminum semi-process non-oriented electrical steel belongs to the technology field of the electrical steel with good magnetic performance. The preparation method includes the processing steps of meeting the requirements for the casting blank, such as the chemical components comprise less than or equal to 0.005% of C, 0.1%-1.0% of Si, less than or equal to 0.35% of Mn, less than or equal to 0.08% of P, less than or equal to 0.01% of S, less than or equal to 0.008% of N, less than or equal to 0.015% of O, inevitable impurities and Fe in balancing amount, according to the composition design for the hot rolling raw material; hot-charging and hot-rolling of the casting blank; acid-cleaning and cold-rolling of the steel plate after the hot-rolling; intermediate-annealing of the steel strip; cold-rolling of the critical deformation; relieving stress and annealing by users; and obtaining the semi-process non-oriented electrical steel with good magnetic performance. The method has the advantage that the final product has good magnetic performance: P15 / 50 is equal to 3.45-5.05 W / Kg, and B5000 is equal to 1.69-1.76 T. The casting blank contains no alloying elements such as Al, Sn, Sb, Cu, Cr, Ni, B, rare earth elements, etc., thus considerably reducing the production cost. The larger critical rolling reduction is adopted, the annealing technique is optimized, and the prepared finished products have better magnetic performance.

Description

technical field [0001] The invention belongs to the technical field of electrical steel, and in particular provides a method for preparing a low-carbon, low-silicon, aluminum-free semi-process non-oriented electrical steel. The electrical steel has excellent magnetic properties. Background technique [0002] Semi-process is a manufacturing method that can give full play to the best performance of low-carbon and low-silicon electrical steel. It has a series of advantages such as improving the hardness and punching properties of products, improving the magnetic properties of products, reducing production costs, and preventing rust and corrosion of products. , more and more favored by electrical steel manufacturers and users. 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, semi-process cold-rolled non-oriented electrical steel with low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B37/74B21B37/16C22C38/04C21D1/26C21D8/02
Inventor 刘杰罗文彬赵宇王全礼刘东旭解清阁彭凯张莉霞耿立杜守志夏兆所周谊军潘丽梅倪献娟许学勇郭亚东刘和平罗海文王崇学
Owner SHOUGANG CORPORATION
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