Silicon steel sheets for electrical purposes are commonly known as silicon steel sheets or silicon steel sheets. As the name suggests, it is electrical silicon steel with a silicon content of up to 0.8%-4.8%, which is made by hot and cold rolling. Generally, the thickness is less than 1mm, so it is called thin plate. Silicon steel sheets broadly speaking belong to the plate category and are an independent branch due to their special uses. Silicon steel sheets for electrical purposes have excellent electromagnetic properties and are indispensable and important magnetic materials in the power, telecommunications and instrument industries.
(1) Classification of silicon steel sheets
A. Silicon steel sheets can be divided into low silicon and high silicon according to their silicon content. Low silicon wafers contain less than 2.8% silicon. They have a certain mechanical strength and are mainly used to make motors, commonly known as motor silicon steel sheets. High silicon wafers contain 2.8%-4.8% silicon. They have good magnetism but are brittle and are mainly used for Used in manufacturing transformer cores, commonly known as transformer silicon steel sheets. There is no strict boundary between the two in actual use, and high-silicon wafers are commonly used to manufacture large motors.
B. According to the production and processing technology, it can be divided into two types: hot rolling and cold rolling. Cold rolling can be divided into two types: grain non-oriented and grain oriented. Cold-rolled sheets have uniform thickness, good surface quality, and high magnetic properties. Therefore, with the development of industry, hot-rolled sheets have a tendency to be replaced by cold-rolled sheets (our country has clearly required the discontinuation of the use of hot-rolled silicon steel sheets, which is what was previously called "Replacing heat with cold").
(2) Silicon steel sheet performance indicators
A. Low iron loss. The most important indicator of quality, countries around the world use iron loss value to classify grades. The lower the iron loss, the higher the grade and the higher the quality.
B. High magnetic induction intensity. Silicon steel sheets can obtain higher magnetic induction under the same magnetic field. The size and weight of the motor or transformer core made with it are relatively small, which can save silicon steel sheets, copper wires and insulating materials.
C. The stacking coefficient is high. The surface of the silicon steel sheet is smooth, flat and uniform in thickness, and the stacking coefficient of the core is improved.
D. Good film processing properties. This is even more important for manufacturing 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 annealed and pickled before delivery.
