The invention discloses a preparation method of high-magnetic-induction oriented
silicon steel and the high-magnetic-induction oriented
silicon steel. The preparation method specifically comprises the following steps that cold-rolled
strip steel is provided; after the cold-rolled
strip steel is subjected to
decarburization annealing operation,
nitriding treatment is conducted, and nitrided cold-rolled
strip steel is obtained; wherein the
nitriding treatment comprises at least two
nitriding stages, the temperatures of the multiple nitriding stages are increased step by step, and the total content of
nitrogen elements permeated into the cold-rolled strip steel in the multiple nitriding stages is 100 ppm to 250 ppm; the surface of the nitrided cold-rolled strip steel is coated with an annealing isolation
coating, coiling is conducted, and a steel coil is obtained; and the steel coil is sequentially subjected to high-temperature annealing treatment, tensile stress
coating coating, stretching flattening annealing and surface nicking treatment, and the oriented
silicon steel finished product is obtained. The invention relates to the technical field of oriented silicon steel, the nitriding layer depth in the nitriding process can be increased, the morphology and size of formed
nitride can be improved, more fine and dispersed inhibitors can be finally formed, and the magnetic level of the prepared high-magnetic-induction oriented silicon steel can be improved.