Production method of non-oriented silicon steel

A technology of oriented silicon steel and production methods, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of inconsistent magnetic properties of non-oriented silicon steel and increased production costs, etc.

Pending Publication Date: 2021-09-17
ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the object of the present invention is to provide a production method of non-oriented silicon steel, which can solve the problem of inconsistency in the magnetic properties of non-oriented silicon steel of medium and low grades on the premise of not significantly increasing the production cost. And ensure good magnetic properties

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  • Production method of non-oriented silicon steel
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  • Production method of non-oriented silicon steel

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Embodiment Construction

[0027] One embodiment of the present invention provides a method for producing non-oriented silicon steel. Specifically, the production method includes the following steps.

[0028] Step 1) Steelmaking is carried out according to the mass percentage of Si in the chemical composition being 0.3-1.2%, and a cast slab is prepared.

[0029] In this step 1, that is, the steelmaking process and the casting slab process, steelmaking is carried out according to the mass percentage of Si in the chemical composition being 0.3 to 1.2%. Correspondingly, the Si mass percentage in the chemical composition of the obtained slab and the final non-oriented silicon steel product is 0.3 to 1.2%.

[0030] Preferably, the cast slab obtained in step 1 has a thickness of 200-240 mm and a length of 10-11 m.

[0031]Step 2) Heating the slab obtained in step 1 to 1050-1150°C and keeping it warm for more than 150 minutes, then rolling it into an intermediate slab with a thickness of 40-45mm, and then fi...

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Abstract

The invention discloses a production method of non-oriented silicon steel. The production method comprises the following steps that steelmaking and blank making are conducted according to 0.3-1.2% of Si; a casting blank is heated to 1050-1150 DEG C and subjected to heat preservation for more than 150 minutes, then the casting blank is rolled into an intermediate blank with the thickness of 40-45 mm, a hot-rolled coil with the thickness of 3.00+ / -0.25 mm is obtained through finish rolling and coiling, and the initial rolling temperature of finish rolling is smaller than or equal to Ar1=872 DEG C+1000*(11*[Si]-14*[Mn]+21*[Al]); when Ar1 is larger than or equal to 1000 DEG C, the finish rolling temperature T is smaller than or equal to 840 DEG C, otherwise, T is smaller than or equal to Ar1-160 DEG C; the coiling temperature is less than or equal to 550 DEG C; normalizing and acid continuous rolling are conducted to obtain a cold hard coil of 0.500+ / -0.005 mm, wherein the normalizing temperature is 850-950 DEG C; the annealing temperature is 820-950 DEG C, and the non-oriented silicon steel finished product is obtained through finished product annealing, cooling, coating and finishing.

Description

technical field [0001] The invention belongs to the technical field of steel material preparation and relates to a production method of non-oriented silicon steel. Background technique [0002] Non-oriented silicon steel is the iron core material of the motor and generator rotor working in the rotating magnetic field, and its quality stability is of great significance for improving the quality level of the motor. The Si content of low- and medium-grade non-oriented silicon steel is controlled at 0.5% to 1.7%. The existing general production process is generally steelmaking-slab casting-hot rolling-acid rolling-annealing-coating and finishing. Among them, equiaxed ferrite + deformed ferrite is obtained in the hot rolling process, and the ferrite grain size and the proportion of equiaxed ferrite are significantly affected by the rolling temperature and coiling temperature in the hot rolling process; However, due to the rapid heat dissipation from the head and tail of the hot-...

Claims

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Application Information

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IPC IPC(8): C21D1/26C21D1/74C21D6/00C21D8/12C21D9/46C22C38/02C22C38/04C22C38/06C22C38/34C22C38/42C22C38/46C22C38/48C22C38/50
CPCC21D1/26C21D1/74C21D6/005C21D6/008C21D8/1216C21D9/46C21D6/004C22C38/004C22C38/02C22C38/04C22C38/008C22C38/34C22C38/48C22C38/46C22C38/50C22C38/42C22C38/06
Inventor 岳重祥吴圣杰张建雷李化龙
Owner ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD
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