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Cold-rolled non-oriented silicon steel with high magnetic induction and low iron loss for high-efficiency motor and manufacture method thereof

A technology of oriented silicon steel and manufacturing method, which is applied in the field of iron and steel metallurgy and processing, can solve problems such as unclear reasons, and achieve the effects of low equipment requirements, strong process versatility, and simple production process

Inactive Publication Date: 2011-08-17
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(2) Improve the texture of non-oriented silicon steel by adding appropriate amounts of Sn, Sb, Cu, Mn and other elements, the reason is still unclear

Method used

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  • Cold-rolled non-oriented silicon steel with high magnetic induction and low iron loss for high-efficiency motor and manufacture method thereof
  • Cold-rolled non-oriented silicon steel with high magnetic induction and low iron loss for high-efficiency motor and manufacture method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The chemical composition (by weight percentage) is: C: 0.0046, Si+Al=1.09+0.05, Mn: 0.59, P: 0.0045%, S: 0.0014%, N: 0.0045%, Cu: 0.38, the rest is iron and For the forged billet that avoids impurities, after soaking at 1100°C, it is hot-rolled 5 times, the total reduction rate is 90%, and the reduction rate per pass is 25-40%, that is, from 20mm→12mm→7.2mm→4.4 mm→2.7mm→2.0mm. The finish rolling temperature is 910°C, and the coiling temperature is 540°C. After the hot-rolled sheet is pickled and descaled, it is cold-rolled to a finished product thickness of 0.5mm by a cold-rolling method, and then dried in 25% H 2 +75%N 2 (dew point below 0°C) Finish annealing in a protective atmosphere. The magnetic properties of the resulting finished product are: B 50 =1.72T, iron loss P 1.5 = 3.98W / kg.

Embodiment 2

[0022] The chemical composition (by weight percentage) is: C: 0.0041, Si+Al=1.12+0.14, Mn: 0.56, P: 0.0048%, S: 0.0016%, N: 0.0044%, Cu: 0.17, the rest is iron and For the forged billet that avoids impurities, after soaking at 1150°C, it is hot-rolled for 5 passes, the total reduction rate is 90%, and the reduction rate for each pass is 25-40%, that is, from 21mm→12.6mm→7.6mm→ 4.6mm→2.8mm→2.0mm. The finish rolling temperature is 950°C, and the coiling temperature is 560°C. After the hot-rolled sheet is pickled and descaled, it is cold-rolled to a finished product thickness of 0.5mm by a cold-rolling method, and then dried in 25% H 2 +75%N 2 (dew point below 0°C) Finish annealing in a protective atmosphere. The magnetic properties of the resulting finished product are: B 50 =1.71T, iron loss P 1.5 = 3.94W / kg.

Embodiment 3

[0024] The chemical composition (by weight percentage) is: C: 0.0045, Si+Al=1.10+0.11, Mn: 0.58, P: 0.0046%, S: 0.0013%, N: 0.0023%, Cu: 0.30, the rest is iron and For the forged billet that avoids impurities, after soaking at 1150°C, it is hot-rolled for 5 passes, the total reduction rate is 91%, and the reduction rate for each pass is 30-40%, that is, from 23mm→13.8mm→8.3mm→ 5.1mm→3.2mm→2.1mm. The finish rolling temperature is 940°C, and the coiling temperature is 550°C. After the hot-rolled sheet is pickled and descaled, it is cold-rolled to a finished product thickness of 0.5mm by a cold-rolling method, and then dried in 25% H 2 +75%N 2 (dew point below 0°C) Finish annealing in a protective atmosphere. The magnetic properties of the resulting finished product are: B 50 =1.72T, iron loss P 1.5 = 3.95W / kg.

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Abstract

The invention belongs to the technical fields of steel metallurgy and processing, in particular to cold-rolled non-oriented silicon steel with high magnetic induction and low iron loss for a high-efficiency motor and a manufacture method thereof. The manufacture method is characterized in that 0.5-0.6 percent of Mn and 0.1-0.4 percent of Cu are added to the cold-rolled non-oriented silicon steel containing Si and Al with the weight percentage of 1.1-1.3 percent, a great amount of Cu-contained compounds precipitated from a hot-rolled strip are utilized to stimulate the formation of beneficial texture components (110) in steel under the conditions of rolling and coiling processes and lessen the formation of adverse texture components (111) so that the magnetic performance of steel is greatly improved. The cold-rolled non-oriented silicon steel with high magnetic induction and low iron loss for a high-efficiency motor, which is manufactured by using the method, has magnetic induction strength B50 over 1.7T and iron loss P1.5 less than 4.0 W / kg.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and processing, in particular to a high magnetic induction low iron loss cold-rolled non-oriented silicon steel for high-efficiency motors and a manufacturing method thereof. Background technique [0002] In recent years, with the progress of high-speed motors in high efficiency and miniaturization, the requirements for the magnetic properties of non-oriented silicon steel are getting higher and higher. Foreign countries have been researching and developing cold-rolled non-oriented silicon steel for high-efficiency motors with high magnetic induction and low iron loss. . The main factors that significantly affect the magnetic induction and iron loss of non-oriented silicon steel are composition, impurity content, grain size and grain orientation. At present, the control of impurity content and grain size in non-oriented silicon steel has reached a very high level, and the potent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C33/04C21D8/12
Inventor 曾燕屏李友国
Owner UNIV OF SCI & TECH BEIJING
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