Method for preparing batch annealing low-grade non-oriented electrical steel

A technology of oriented electrical steel and bell annealing, which is applied in the field of electrical steel, can solve the problems of increasing production costs and achieve the effect of low cost

Inactive Publication Date: 2013-07-17
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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 batch annealing low-grade non-oriented electrical steel
  • Method for preparing batch annealing low-grade non-oriented electrical steel
  • Method for preparing batch annealing low-grade non-oriented electrical steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The chemical composition of the continuous casting slab is as follows:

[0012] Table 1 Chemical composition of continuous casting slab Unit: % (mass)

[0013]

[0014] The thickness of the hot-rolled steel strip is 3.0mm. The air-cooled hot-rolled steel strip is pickled and then cold-rolled. After continuous cold rolling, the reduction rate is 3.6~36.0%. The steel coil after cold-rolling is protected by 75% nitrogen and 25% hydrogen bell annealing furnace annealing, the annealing temperature is 690 ~ 730 ℃, 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.

[0015] Table 2 Iron loss value and magnetic properties of the product

[0016]

Embodiment 2

[0018] The chemical composition of the continuous casting slab is as follows:

[0019] Table 3 Chemical composition of continuous casting slab Unit: % (mass)

[0020]

[0021] The thickness of the hot-rolled steel strip is 3.0mm. The air-cooled hot-rolled steel strip is pickled and then cold-rolled. After continuous cold rolling, the reduction rate is 3.6~36.0%. The steel coil after cold-rolling is protected by 75% nitrogen and 25% hydrogen bell annealing furnace annealing, the annealing temperature is 690 ~ 730 ℃, 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.

[0022] Table 4 Iron loss value and magnetic properties of the product

[0023]

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Abstract

The invention relates to a method for preparing batch annealing low-grade non-oriented electrical steel. The method is characterized in that a low-carbon continuously cast sheet billet is used as a hot rolling raw material, wherein the thickness of a casting blank is 2.5-3.5mm, and the hot rolling raw material comprises the following elements by mass fraction; 0.004-0.008% of C, 0.60-0.80% of Si, 0.23-0.45% of Mn, less than or equal to 0.08% of P, less than or equal to 0.008% of S, less than or equal to 0.007% of N, less than or equal to 0.005% of O, 0.20-0.35% of Al and the balance of iron and unavoidable impurities; and seven-rack hot continuous rolling, five-rack cold continuous rolling and batch annealing are carried out so as to finally obtain the non-oriented electrical steel with excellent magnetic characteristics. The method has the advantages that the steel is low in silicon content and O and N contents, a cold rolling rate of 3.6-36% is adopted, and the low-grade non-oriented electrical steel with excellent magnetic characteristics and low cost is produced after batch annealing; and a final product has the specification of 0.65mm and magnetic characteristics of P15 / 50 equaling to 6.57-9.82W / Kg and B5000 equaling to 1.69-1.74T.

Description

Technical field: [0001] The invention belongs to the technical field of electrical steel, and relates to a method for preparing a bell-type annealed low-grade non-oriented electrical steel. The electrical steel has excellent magnetic properties. Background technique: [0002] At present, with the rapid development of my country's electromechanical industry, the demand for electrical steel (silicon steel) is increasing. Compared with other steel types, electrical steel has strict requirements on magnetic properties, processing properties, and insulation, among which magnetic properties require low iron loss, high magnetic induction intensity and different magnetic anisotropy. Non-oriented silicon steel is mainly used in motors. For the production of silicon steel, the chemical composition and purity of raw materials, the casting structure of slab, hot rolling process, cold rolling and heat treatment process are all important factors affecting the final quality of silicon stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/06
Inventor 黄利张秀飞杨雄康利明苗瑞林
Owner INNER MONGOLIA BAOTOU STEEL UNION
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