Preparation method of high-magnetic-strength thin-gauge non-oriented silicon steel

Abstract

The invention belongs to the field of metal material processing and relates to high-magnetic-strength thin-gauge non-oriented silicon steel and a preparation method thereof. The preparation method of the high-magnetic-strength thin-gauge non-oriented silicon steel comprises the following steps: selecting a silicon steel ingot casting as a raw material, wherein the silicone steel ingot casting contains the following components (in percent by mass): 2.8-3.2% of Si, 0.025-0.045% of C, 0.05-0.35% of Mn, less than or equal to 0.008% of P, less than ore equal to 0.005% of N, less then or equal to 0.02% of S and balance of Fe and inevitable impurities, and volume percent of columnar crystals in the ingot casting is 50-100%; heating the silicon steel ingot casting to 1200-1350 DEG C, carrying out hot rolling, normalizing at the temperature of 1110-1150 DEG C, rolling until thickness is 0.12-0.2mm by adopting a two-stage cold-rolling method including intermediate annealing, then carrying out decarburizing annealing, and finally carrying out final annealing for 10-20 minutes at the temperature of 900-950 DEG C. The preparation method of the high-magnetic-strength thin-gauge non-oriented silicon steel has the advantages that a processing technology easier to implement is adopted and a thin-gauge non-oriented silicon steel product with magnetic strength B50 more than 1.73T is obtained.

Description

technical field

[0001] The invention belongs to the field of metal material processing, and relates to a high magnetic induction thin-gauge non-oriented silicon steel and a preparation method. Background technique

[0002] With the rapid development of the national economy, energy conservation and emission reduction has become an issue worthy of more and more attention, and low-efficiency motors need to be replaced by high-efficiency motors. Non-oriented silicon steel is widely used in the production of motors, and its low magnetic induction will cause high copper loss during the use of the motor, and copper loss accounts for the main part of the loss. Therefore, the non-oriented silicon steel product with high magnetic induction is the core to realize the high efficiency of the motor. At the same time, with the application of frequency conversion technology, thin gauge non-oriented silicon steel is an important research and development direction. At present, the existing ...