Method for improving magnetic performance of copper-containing oriented silicon steel

Abstract

The invention relates to a method for improving the magnetic performance of copper-containing oriented silicon steel. The method comprises the steps that S1, steel making, secondary refining and continuous casting are conducted, and then a plate blank with the following components including, by weight, 0.040%-0.055% of C, 3.00%-3.40% of Si, 0.1%-0.30% of Mn, 0.006%-0.030% of ALs, 0.4%-0.7% of Cu, 0.006%-0.012% of N, smaller than or equal to 0.025% of S and the balance Fe and inevitable impurities is obtained; s2, the plate blank is subjected to hot rolling and primary cold rolling; s3, after primary cold rolling, performing decarburization annealing under the protection of a nitrogen and hydrogen wet atmosphere with the temperature of 800-900 DEG C and the ratio of hydrogen partial pressure to water vapor partial pressure of 0.2-0.5, so that the oxygen content in the copper-containing oriented silicon steel is 700-900 ppm; s4, carrying out secondary cold rolling after decarburization annealing, and then carrying out cold coating of a magnesium oxide separant; and S5, after cold coating of a magnesium oxide separant, high-temperature annealing, discharging, stretching, flattening and annealing are carried out. According to the method for improving the magnetic performance of the copper-containing oriented silicon steel, the magnetic induction intensity B8 of the copper-containing oriented silicon steel is not smaller than 1.9 T, the magnetic performance of the copper-containing oriented silicon steel is improved, the profit per ton of steel is increased, and the application range of the copper-containing oriented silicon steel is widened.

Description

technical field [0001] The invention relates to the technical field of the manufacture of grain-oriented silicon steel, in particular to a method for improving the magnetic properties of copper-containing grain-oriented silicon steel. Background technique [0002] In the field of grain-oriented silicon steel manufacturing, the size and phase of Gaussian grains are one of the main bases for judging the magnetic properties of grain-oriented silicon steel. The so-called Gaussian grain refers to the grain with {110}<001> single texture, which is called "HiB" in Japan and "COE" (cube-on-edge) in Europe and America. In order to obtain Gaussian grains with sufficiently accurate phase (the deviation angle from the rolling direction is less than 5°), it is necessary to rely on the inclusions in the steel to suppress the abnormal growth of the normal primary recrystallized grains, and make the number very small (the proportion is less than 5°). %) Gaussian grains grow abnormall...

AI Technical Summary

Problems solved by technology

However, the content of ALs (acid-soluble aluminum) in the copper-containing oriented silicon steel smelting composition obtained by the existing manufacturing process of oriented silicon steel is low, so that the content of ALN formed in the matrix of oriented silicon steel is low and the inhibition ability is poor, resulting in The prepared copper-containing oriented silicon steel has poor magnetic properties

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