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Method for manufacturing low-iron loss high-magnetic strength non-oriented electrical steel

A technology of oriented electrical steel and manufacturing method, which is applied in the field of electrical steel, can solve problems such as increasing production costs, and achieve the effect of reducing production costs

Active Publication Date: 2009-01-14
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
This patent must be normalized, and both normalized and annealed are carried out under a full hydrogen atmosphere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The chemical composition (%) of the laboratory steel slab is shown in Table 1.

[0024] The chemical composition (%) of table 1 experimental steel slab

[0025] Sample No.

Si

Al

mn

C

S

P

O

N

the remaining

A

1.48

0.54

0.33

0.003

0.005

＜0.005

0.0045

0.0035

Fe and unavoidable impurities

B

1.44

0.58

0.34

0.003

0.006

＜0.005

0.018

0.0036

Fe and unavoidable impurities

C

1.68

0.22

0.33

0.002

0.005

＜0.005

0.0014

0.0034

Fe and unavoidable impurities

D

1.73

0.28

0.33

0.002

0.005

＜0.005

0.0011

0.0034

Fe and unavoidable impurities

E

2.04

0.038

0.32

0.002

0.005

＜0.005

0.0035

0.0035

Fe and unavoidable impurities

F

1.94

...

Embodiment 2

[0030] Steel D billets are hot-rolled to a thickness of 2.1-2.6mm, not normalized or normalized at 900-1050℃×60-180s, steel plates are pickled and cold-rolled to 0.50mm, and annealed at 900-1050℃×180-240s treatment, the annealing atmosphere is 30% H 2 +70%N 2 The mixed gas does not need to be humidified and decarburized. The cooling method is to cool the furnace mouth to 500-400 ° C, and then air-cool to room temperature for magnetic detection. See Table 3 for details.

[0031] Table 3 Finished magnetic properties of experimental steel

[0032] Sample No.

[0033] F-1

Embodiment 3

[0035] Steel B, E, and F billets are hot-rolled to a thickness of 2.3mm, normalized at 950-1050°C for 60-180s, cold-rolled to 0.50mm after pickling, and annealed at 900-1050°C for 60-240s. Annealing atmosphere is 30%H 2 +70%N 2 The mixed gas does not need to be humidified and decarburized. The cooling method is to cool the furnace mouth to 500-400 ° C, and then air-cool to room temperature for magnetic detection. See 4 for details.

[0036] Table 4 Finished magnetic properties of experimental steel

[0037] Sample No.

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Abstract

Disclosed is a manufacturing method for low iron loss and high magnetic induction non-oriented electric steel, which belongs to the technical field of the electric steel. The invention adopts the process steps: the heating temperature for casting billet is between 900 DEG C to 1150 DEG C, a hot rolled plate is cold-rolled to 0.50 mm after being normalized and acid-cleaned and is positioned in hydrogen-nitrogen mixed gas to undergo the stress removal and annealing treatment, and the low iron loss and high magnetic induction non-oriented electric steel product can be obtained. The invention has the advantages that the final magnetic property of the product is good, namely P15 / 50 equals to 3.1 to 3.8 W / Kg and B5000 equals to 1.69 T to 1.81 T; Si accounts for 1.0 percent to 2.0 percent, Al accounts for 0 percent to 0.60 percent and Si and 3Al equals to or is larger than 1.5 percent and equals to or is less than 3.2 percent in the casting billet, alloying elements of Sn, Sb, Bi, Cu, Cr, Ni, B, Ca, Ce and the like are not contained in the product, the manufacturing cost is greatly reduced, and the magnetic property of the finished product is excellent.

Description

technical field [0001] The invention belongs to the technical field of electrical steel, and in particular provides a method for manufacturing non-oriented electrical steel with low iron loss and high magnetic induction. The electrical steel has excellent magnetic properties. Background technique [0002] The world's resources are becoming less and less, and power resources are one of them. All countries are increasingly feeling that power loss is a serious and significant issue. Whether it is the Chinese government or the enterprises that produce and use electrical steel, they also attach great importance to this issue, and are planning and implementing it accordingly. Therefore, the development of electrical steel products with high magnetic induction and low iron loss has become a major product development direction and development hotspot for various electrical steel manufacturers. The welcome of the company has prompted its products to gradually develop in the directio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/06C21D1/30
Inventor 罗文彬刘杰王全礼刘东旭解清阁彭凯张莉霞耿立郭亚东杜守志王崇学
Owner SHOUGANG CORPORATION
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