Production method of non-oriented silicon steel

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-...

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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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