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Silicon steel sheet performance introduction

Jan 05, 2023

Silicon steel sheet is essentially an extremely low carbon steel sheet with a mass fraction of silicon of 0.5% to 5%. Silicon steel sheets can be divided into motor silicon steel sheets (the mass fraction of silicon is usually below 2.5%, and the thickness is generally 0.5mm) and transformer silicon steel sheets (the mass fraction of silicon is usually 2.5% to 4.5%) according to the application. , the thickness is generally O. 35mm); according to the production method, it can be divided into hot-rolled silicon steel sheet and cold-rolled silicon steel sheet, and cold-rolled silicon steel sheet can be divided into oriented silicon steel sheet (used to manufacture transformers) and non-oriented silicon steel sheet (used to manufacture motors) according to the degree of grain orientation; according to working conditions, it can be divided into silicon steel sheet used under strong magnetic field (mostly used in electric power industry, which is the most common and largest amount) and silicon steel sheet used under weak magnetic field (multi-purpose In the telecommunications industry), as well as silicon steel sheets used at industrial frequencies and silicon steel sheets used at high frequencies. For silicon steel sheets used at high frequencies, in order to reduce eddy current losses at high frequencies, O. The thickness of 1 ~ 0.2mm, and those used for pulse transformers can be as thin as 0.05mm or less.

 

The magnetic directionality and (110)L001J~ easy magnetization axis [100] of the iron single crystal are parallel to the rolling direction, and the (110) plane is parallel to the rolling plane, so the magnetic induction of the silicon steel sheet along the rolling direction is the highest, with ( 110) The grain orientation of [001] is called Gaussian texture. This directional silicon steel is called grain-oriented silicon steel or grain-oriented silicon steel. Grain-oriented silicon steel is used in transformers, and the higher the degree of orientation, the better. This is because the higher the degree of orientation, the smaller the magnetostriction (the so-called magnetostriction is the phenomenon that ferromagnetic substances elongate or shrink when magnetized, which is the main cause of transformer noise), and the magnetism of the silicon steel sheet is stronger. Good, and reduce iron loss. Non-oriented silicon steel is used in motor manufacturing.

 

Performance index of silicon steel sheet

A. Low iron loss. The most important indicator of quality, all countries in the world classify grades by iron loss value, the lower the iron loss, the higher the grade and the higher the quality.

B. High magnetic induction. Silicon steel sheets with higher magnetic induction can be obtained under the same magnetic field, and the volume and weight of motor or transformer iron cores made with it are relatively small, and silicon steel sheets, copper wires and insulating materials can be relatively saved.

C. High stacking factor. The surface of the silicon steel sheet is smooth, flat and uniform in thickness, and the stacking factor of the iron core is improved.

D. The filming property is good. This is even more important for the manufacture of small and micro motor cores.

E. The surface has good adhesion and weldability to the insulating film.

F. Magnetic aging

G. Silicon steel sheets must be delivered after annealing and pickling.

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