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Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction

A technology of oriented electrical steel sheets and production methods, applied in the direction of manufacturing tools and other manufacturing equipment/tools, etc., can solve the problems of increasing the length of annealing furnace, long normalization time, high cost, etc., and achieve shortening of normalization time and easy growth of crystal grains Great effect with low iron loss

Active Publication Date: 2008-12-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second method increases the alloy cost of the steel
In the former method, the hot-rolled plate is treated in the soaking section of the annealing furnace for a long time, while in the latter method, not only the normalization time is long, but also the cooling time is very long. Both of these methods increase the length of the annealing furnace, and the investment in equipment is large. high cost

Method used

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  • Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction
  • Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction
  • Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Converter, RH vacuum treatment and continuous casting to obtain the continuous casting slab with the composition shown in Table 1, which was hot rolled into a 2.5mm thick hot rolled plate. Perform normalization treatment according to the process shown in Table 2, then pickle and cold-roll into a 0.50mm thick cold-rolled sheet, and perform annealing treatment, and then coat the surface with an insulating layer. The magnetic detection results are shown in Table 2.

[0037] Table 1wt%

[0038]

Example

C

mn

P

Si

S

N

Al

sn

Sb

Ac1

(℃)

1

0.0020

0.50

0.20

0.10

0.0030

0.0015

0.001

950

2

0.0015

0.10

0.018

2.49

0.0045

0.0015

0.001

1090

3

0.0025

0.30

0.015

1.45

0.0043

0.0025

...

Embodiment 2

[0043] After the component 1 in Table 1 in the embodiment is treated according to the normalization process shown in Table 2, annealing at 700 ° C × 30 s is carried out after the first cold rolling, and then 5% reduction rate is smoothed to 0.5 mm. The samples were annealed at 780°C×1h, and the magnetic properties were measured. The magnetic properties are shown in Table 3.

[0044] table 3

[0045]

[0046] As can be seen from Table 2 and Table 3, the magnetic properties of the finished boards obtained by the process of the present invention have obvious advantages over the magnetic properties of the finished boards obtained by the process of the comparative example (low temperature for a long time or the first stage of faster cooling). Explain that the hot-rolled sheet produced by the specified composition and hot-rolling process of the present invention passes through Ac1 point above, below 1100 ℃ high-temperature short-time annealing, after 15 ℃ / s cooling to below 650 ℃...

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Abstract

A production method of low iron loss and high magnetic induction cold-rolled non-oriented electrical steel strip, which includes the following steps: a. The composition is C≤0.0050%, Si≤2.50%, Al≤1.0%, and Si+2Al≤2.50%, Mn : 0.10%~1.50%, P≤0.20%, S≤0.005%, N≤0.0025%, one or two of Sn and Sb can be added, the total amount does not exceed 0.2%, the rest is iron and unavoidable impurities, The above is the weight percentage; b. smelting, continuous casting, hot rolling; c. normalization treatment, the obtained hot-rolled plate is subjected to normalization treatment: the heating rate is raised to Ac 1 Above and below 1100℃ for soaking, soaking time: 10s≤t≤90s; cooling, using two-stage cooling: cooling the steel strip to below 650℃ at ≤15℃ / s, and then to ensure the plate shape Cooling at a rate below 80°C; d. cold rolling to make cold-rolled sheets; e. annealing to make cold-rolled non-oriented electrical steel sheets.

Description

technical field [0001] The invention relates to a cold-rolled non-oriented electrical steel sheet, in particular to a production method of a cold-rolled non-oriented electrical steel sheet with excellent magnetic properties. Background technique [0002] Cold-rolled non-oriented electrical steel with high magnetic induction and low iron loss is a hot spot in the development of non-oriented electrical steel in recent years. It is developed to meet the requirements of high efficiency and miniaturization for various types of motors and electronic transformer cores in recent years. The loss of the motor mainly includes two parts, one is the iron loss, that is, the core loss, and the other is the copper loss, that is, the loss caused by the wire resistance. For cold-rolled non-oriented electrical steel, iron loss is mainly composed of hysteresis loss and eddy current loss. In general, in order to reduce the eddy current loss, measures such as increasing the content of Si, Al and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P23/04C22C38/06
Inventor 李保国王波刘献东张丕军张文学陈晓
Owner BAOSHAN IRON & STEEL CO LTD
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