Non-oriented silicon steel and production method thereof

Abstract

The invention discloses non-oriented silicon steel and a production method thereof. The production method comprises the following steps that steelmaking is carried out according to 0.8%-1.1% of Si and 0.2%-0.4% of Mn without adding Sn or Sb, and a blank is prepared; the casting blank is heated to 1060-1120 DEG C and subjected to heat preservation for 150 min or above, then the casting blank is rolled into an intermediate blank with the thickness of 40-45 mm, and a hot-rolled coiled plate with the thickness of 3.00+ / -0.25 mm is obtained through finish rolling and coiling, wherein the initial rolling temperature of finish rolling is less than or equal to 872 DEG C+1000*(11*[Si]-14*[Mn] +21*[Al]), and the finish rolling temperature of finish rolling is less than or equal to 820 DEG C, and the coiling temperature is less than or equal to 560 DEG C; normalizing and acid continuous rolling are carried out to obtain a cold hard coil with the thickness of 0.500+ / -0.005 mm, wherein the normalizing temperature is 850-900 DEG C; and the annealing temperature of a finished product is 820-880 DEG C, and cooling, coating and finishing are carried out after annealing to obtain the non-oriented silicon steel.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material preparation, and relates to a non-oriented silicon steel and a production method thereof. 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...

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Problems solved by technology

[0004]Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a non-oriented silicon steel and its production method, without significantly increasing the production cost, satisfying small and medium-sized Under the premise of the motor's requirements for low- and medium-grade non-oriented silicon steel, solve the problem of inconsistent magnetic properties of non-oriented silicon steel

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