Thin-gauge high-grade silicon steel and production method thereof

Abstract

The invention discloses thin-gauge high-grade silicon steel and a production method thereof. The method comprises the following steps that materials are selected, specifically, the selected raw materials comprise the following chemical components in percentage by mass: less than or equal to 0.003% of C, 2.0-3.0% of Si, greater than or equal to 0.5% of Al, 0.10-0.50% of Mn, less than or equal to 0.02% of P, less than or equal to 0.003% of N, less than or equal to 0.003% of Ti, and the balance Fe, wherein Si+Al is less than or equal to 3.5%; heating is carried out, specifically, the raw materials are smelted and cast into a blank, and then the cast blank is heated; hot rolling is carried out, specifically, the cast blank is hot-rolled into a silicon steel strip with the thickness of 2.3 mm;normalizing is carried out, specifically, normalizing treatment is carried out on the hot-rolled silicon steel strip; cold rolling is carried out, specifically, the silicon steel strip subjected to normalizing treatment is cold-rolled into a thin-gauge steel strip with the thickness of 0.3 mm; continuous annealing is carried out, specifically, continuous annealing is carried out on the cold-rolledthin-gauge steel strip, wherein the annealing temperature is 950-1100 DEG C, the tension in a furnace is within 2-4 MPa, and after discharging is carried out, the thin-gauge steel strip is cooled to700 DEG C at a cooling speed of less than or equal to 20 DEG C / s; and coating is carried out, specifically, the thin-gauge steel strip is coated with an insulating layer after being cooled to room temperature. According to the thin-specification high-grade silicon steel and the manufacturing method thereof, the annealing tension and the cooling speed are reduced, so that the transverse longitudinal strength difference of the thin-specification high-grade silicon steel is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of silicon steel materials, in particular to a thin-gauge high-grade silicon steel and a manufacturing method thereof. Background technique [0002] The development of high speed and miniaturization of high-speed motors requires the development of silicon steel sheets for motor iron cores to thin specifications, high grades, high strength and high dimensional accuracy. However, with the increase of the alloy content, the difference between the transverse and longitudinal yield strength of the silicon steel sheet increases, the processing accuracy of the product is poor, and the electromagnetic noise is large, which cannot meet the needs of high-end users. [0003] In the prior art, the Chinese patent CN106929752A discloses a low-silicon non-oriented silicon steel and a method for controlling the lateral and longitudinal yield strength heterogeneity. The mass percentage of the silicon steel is as follows: C≤0...

AI Technical Summary

Problems solved by technology

The existing technology only reduces the difference in the transverse and longitudinal yield strength of silicon steel sheets with a thickness of 0.50mm and low grades through composition control, and does not elaborate on the control measures for the transverse and longitudinal strength differences of silicon steel sheets from the perspective of process control; nor does it involve thin specifications, Control Measures for Poor Transverse and Longitudinal Strength of High Grade Silicon Steel

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