Method for Improving Magnetic Properties of Cold Rolled Non-Oriented Silicon Steel

Abstract

The invention discloses a method for improving the magnetic properties of cold rolling non-oriented silicon steel, which comprises the following steps of : acid-washing, cold rolling and continuously annealing; the step continuously annealing: adding an inorganic salt coating device in a continuous annealing and washing system, and uniformly coating a layer of inorganic salt solution on a cold-rolled silicon steel strip through the inorganic salt coating device, wherein the inorganic salt solution contains the following components in weight percentage: 0.5-5.0% of K2CO3, l0.5-2% of NaC10, 1-8% of MgO and the rest of H2O, the coating quantity of the inorganic salt solution is 1-50gm<3>, the plate passing speed is 5-400m / min, and the coated silicon steel strip is dried in a hot air drier, and then, a layer of brown-back fayalite film is formed on the surface of the coated silicon steel strip; and carrying out degradation and decarburization to the silicon steel. In the invention, after the cold-rolled silicon steel is coated with the inorganic salt to form the brown-back fayalite film, so that the decarburization effect is improved, the internal oxidation of the silicon strip can be reduced, and the magnetic properties of the silicon steel strip finished product can be stably improved.

Description

technical field [0001] The invention relates to the production of cold-rolled silicon-free steel. Background technique [0002] like figure 1 As shown, it is part of the production process of cold rolling. Cold rolled silicon steel is a handicraft in steel, and is also a technical product with high added value, high technology content, complex production process, and long process cycle, which usually includes pickling (normalization), Primary cold rolling, intermediate annealing, secondary cold rolling, continuous decarburization annealing coating insulation layer (cycle) and shear packaging and other methods. For non-oriented silicon steel, the main method to determine the magnetic properties of the finished non-oriented silicon steel is continuous decarburization annealing and insulating layer coating. The purpose of this process is as follows. [0003] (1) Complete recrystallization and grow the grains, and finally form perfect and uniform recrystallization grains to ob...

AI Technical Summary

Problems solved by technology

These controls are very complicated, and the control parameters are different for different original carbon contents, different silicon contents, different thicknesses, and different speeds.

If the control is not accurate, there will be no carbon decarburization, or surface oxidation hinders decarburization, and even internal oxidation will cause magnetic deterioration

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