High-silicon steel plate modified by rare-earth yttrium and production method thereof

Abstract

The invention relates to the technical field of high-silicon steel and particularly relates to a high-silicon steel plate modified by rare-earth yttrium. The steel plate is produced by the following chemical components in percentage by mass: 6.0-6.6% of Si, 0.008-0.016% of Y, less than or equal to 0.004% of C, less than or equal to 0.003% of S, less than or equal to 0.005% of O, less than or equalto 0.005% of N, less than or equal to 0.008% of P and the balance of Fe. A production method of the steel plate comprises the following steps: forging a steel ingot into a plate blank at 800-1050 DEGC, carrying out hot rolling at 850-1100 DEG C, carrying out normalizing treatment, carrying out warm rolling at 400-500 DEG C, carrying out intermediate annealing treatment, carrying out hot rollingat 150-200 DEG C to obtain a finished product, then annealing the finished product to obtain the steel plate. Compared with the conventional high-silicon steel plate strip rolling method, the producedhigh-silicon steel sheet with excellent magnetic performance produced by the technical scheme has the advantages of excellent formability, high yield, high magnetic induction and low iron loss.

Description

technical field [0001] The invention relates to the technical field of high-silicon steel, in particular to a high-silicon steel plate modified with rare earth yttrium and a preparation method thereof. Background technique [0002] High-silicon steel refers to Si-Fe alloy containing 4.5%-6.7% Si in mass fraction, and the general-purpose high-silicon steel is 6.5% Si-Fe. The resistivity of high silicon steel with 6.5% Si is ρ=82μΩ·cm, the saturation magnetic induction Bs=1.80T, and the magnetostriction coefficient λs is approximately zero. The magnetic characteristics of high-silicon steel are that the iron loss is significantly reduced at high frequencies, the maximum magnetic permeability is high, and the coercive force is low. Therefore, high-silicon steel is most suitable for the manufacture of high-speed and high-frequency motors, audio and high-frequency transformers, choke coils and magnetic shielding at high frequencies, etc., which can meet the needs of high-efficie...

AI Technical Summary

Problems solved by technology

[0005] But at present, due to the huge output of light rare earths (mainly Ce and La) in China, they mainly come from the Baiyun Obo rare earth mine in Inner Mongolia, while the heavy rare earths (mainly Y) mainly come from Jiangnan ion-type rare earth mines, the output is small, and the price is relatively light The rare earths Ce and La are more expensive, and their development and application are later, so that there are more studies on the addition of light rare earths (Ce and La) to silicon steel, but little research on the addition of rare earth Y, so that there is currently no high-efficiency method for adding rare earth yttrium. Silicon steel plate and its preparation method

Images