Heat treatment method of high-silicon steel plate strip material

A heat treatment method and steel strip technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of several times difference in thermal efficiency, achieve the effects of reduced strength, broad engineering application prospects, and high energy consumption

Active Publication Date: 2012-07-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the thermal efficiency of the same furnace may vary several times, dozens of times or even hundreds of times.

Method used

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  • Heat treatment method of high-silicon steel plate strip material
  • Heat treatment method of high-silicon steel plate strip material
  • Heat treatment method of high-silicon steel plate strip material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] For high-silicon steel with a silicon content of 4% and no boron, the thickness of the plate is 2 mm after hot rolling, and electric pulse heat treatment is performed on it. The processing parameters are: electric pulse frequency 500Hz, pulse width 100μs, peak current density 80A mm -2 , the processing time is 30s, and the plate temperature rises to 850°C during the processing. After treatment, the yield strength and fracture strength of the treated sheet decreased to 550MPa and 650MPa under tensile conditions at 150°C.

Embodiment 2

[0022] For high-silicon steel with a silicon content of 5% and a boron content of 150ppm, the thickness of the plate is 1mm after warm rolling, and electric pulse heat treatment is performed on it. The processing parameters are: electric pulse frequency 350Hz, pulse width 80μs, peak current density 260A mm -2 , the processing time is 10s, and the plate temperature rises to 750°C during the processing. After the treatment, the yield strength of the plate under the tensile condition of 150°C decreased to 610MPa, and the breaking strength decreased to 750MPa.

Embodiment 3

[0024] For high-silicon steel with a silicon content of 6.5% and a boron content of 150ppm, the thickness of the plate is 1mm after warm rolling, and electric pulse heat treatment is performed on it. The processing parameters are: electric pulse frequency 194Hz, pulse width 70μs, peak current density 360A mm -2 , the processing time is 10s, and the plate temperature rises to 825°C during the processing. After the treatment, the yield strength of the sheet under tensile conditions at 150°C dropped to 675MPa, and the breaking strength dropped to 750MPa.

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Abstract

The invention discloses a heat treatment method of a high-silicon steel plate strip material, belonging to the technical field of metal material preparation. In the high-silicon steel, the content of silicon is 4-7% by mass; and the rest are iron, a boron trace element and unavoidable impurity elements. According to the heat treatment method, the high-silicon steel plate strip material after plastic processing is subjected to heat treatment by utilizing high-energy electric pulses, wherein the frequency of the electric pulses is 60-500 Hz, the pulse width is 10-300 mu s, the peak value current density is 20-500 A.mm<-2>, and the treatment time lasts for 3-60 s. The high-energy electric pulse treatment can promote the recrystallization of deformed organization, reduce intensity of a thin plate (strip) and improve plasticity. The heat treatment time is very short and can be finished within seconds to dozens of seconds, so that efficiency of the heat treatment is improved greatly, and energy is saved at the same time; and due to the characteristic of continuous on-line heat treatment, the heat treatment method of the high-silicon steel plate strip material, disclosed by the invention, has wide engineering application prospect.

Description

[0001] technical field [0002] The invention belongs to the technical field of metal material preparation, and relates to a heat treatment method for high-silicon steel strips with high efficiency and low energy consumption. technical background [0003] Compared with ordinary silicon steel (silicon content <3.5%), high-silicon steel (silicon content ≥ 3.5%, weight percentage, the same below) has significantly increased resistivity, magnetic permeability, coercive force, and magnetocrystalline anisotropy. reduce. Especially when the silicon content of high-silicon steel reaches 6.5%, the magnetostriction coefficient is basically reduced to zero, which has the characteristics of low iron loss and low noise, and has a very important application background in the power electronics industry. [0004] The processing ability of high-silicon steel becomes very poor with the increase of silicon content, and the plasticity is almost zero at room temperature, which limits the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52
CPCC21D9/46C21D1/38C21D8/12C21D6/008C21D9/52C21D1/34C21D8/1277C21D8/1294C21D10/00
Inventor 梁永锋叶丰林均品周红婵房现石张来启郝国建
Owner UNIV OF SCI & TECH BEIJING
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