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Preparation method of low-temperature GO-oriented silicon steel

A technology of oriented silicon steel and low temperature, which is applied in metal rolling, manufacturing tools, metal rolling, etc., can solve problems such as complex processes, and achieve the effects of reducing energy consumption, reducing energy consumption per ton of steel, and saving energy

Active Publication Date: 2010-06-23
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of complex processes in the prior art, and to provide a method for producing GO-oriented silicon steel without decarburization annealing after secondary cold rolling

Method used

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  • Preparation method of low-temperature GO-oriented silicon steel
  • Preparation method of low-temperature GO-oriented silicon steel
  • Preparation method of low-temperature GO-oriented silicon steel

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Embodiment Construction

[0015] The present invention will be further described below by way of examples.

[0016] The composition of the steel of the embodiment of the present invention is shown in Table 1.

[0017] Table 1 Composition (wt%) of grain-oriented silicon steel of the embodiment of the present invention

[0018]

[0019] The continuous casting of the embodiment of the present invention adopts electromagnetic stirring technology, and the cooling of the continuous casting slab adopts slow cooling, and the size (length×width×thickness) of the continuous casting slab produced is: 9000×1100×250 mm.

[0020] After the continuous casting slab is heated at low temperature, it is continuously rolled by 7 stands into a hot-rolled coil with a thickness of 2.5mm. Table 2 shows the hot-rolling process parameters of the embodiment of the present invention.

[0021] Table 2 The hot rolling process parameters of grain-oriented silicon steel in the embodiment of the present invention

[0022]

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Abstract

The invention provides a preparation method of low-temperature GO-oriented silicon steel, mainly comprising the following steps of: smelting, continuous casting, hot-rolling, primary cold-rolling, secondary cold-rolling and high-temperature annealing. The preparation method is characterized in that an intermediate annealing process of a cold-rolled sheet is carried out between the primary cold-rolling and the secondary cold-rolling, wherein the annealing process comprises the following steps of: adopting a rapid heating method, wherein the heating speed is 15 to 35DEG C / s, the annealing temperature is 850 to 1150 DEG C, the heat preservation time is 2.5 to 5.5min, the protection atmosphere is 20%H2+80%N2, and the dew point is 35 to 60 DEG C; firstly coating an Al2O3 separant on the surface of the cold-rolled sheet after the secondary cold-rolling, and then carrying out the high-temperature annealing. The preparation method of the low-temperature GO-oriented silicon steel reduces the heating temperature of a sheet blank and the energy consumption of per ton steel, saves the energy source, omits a decarburizing annealing process by adopting a special process of the intermediate annealing process and using the Al2O3 as the separant of the high-temperature annealing, thereby greatly reducing the energy consumption and the production cost.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and in particular relates to a production method of grain-oriented silicon steel. Background technique [0002] The conventional production process of GO oriented silicon steel is that the continuous casting slab is heated at high temperature and then hot rolled to the specified thickness. Decarburization annealing under the protection of moisture to reduce its carbon content to the required content, and then apply magnesium oxide release agent, and finally undergo secondary recrystallization and purify impurities after high-temperature annealing, and prepare finished oriented silicon steel through flattening and stretching annealing. [0003] Decarburization annealing is a very important link in the process of preparing grain-oriented silicon steel, and plays a vital role in the magnetic properties of the finished product. The purpose of decarburization annealing is: to compl...

Claims

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Application Information

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IPC IPC(8): C21D8/00C21D1/26B21B37/16C22C38/06
Inventor 蒋奇武金文旭游清雷付勇军张静庞树芳张海利
Owner ANGANG STEEL CO LTD
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