Electrical steel refers to an extremely low carbon ferrosilicon alloy with a silicon content of 0.5% to 4.5%, which is divided into non-oriented electrical steel and oriented electrical steel due to different structures and uses. electrical steel is mainly used as the core of various motors, generators, compressors, motors and transformers, and is an indispensable raw material product for the electric power, home appliances and other industries.

The classification of electrical steel sheet is roughly hot-rolled electrical steel sheet, and the relevant departments have forced the elimination of electrical steel sheet in recent years. Cold-rolled oriented electrical steel sheet, the most important use is for transformer manufacturing. Cold-rolled oriented electrical steel sheet with high magnetic induction is mainly used in the manufacture of various electromagnetic components such as transformers and chokes in telecommunication and instrumentation industry. Cold-rolled non-oriented electrical steel sheet, the most important use is for motor manufacturing.

The chemical composition of cold-rolled non-oriented electrical steel sheet consists of ferrosilicon alloy with very low carbon content. In the deformed and annealed steel plate, the grains are randomly oriented. Also known as low silicon wafer, the silicon content of the alloy is 1.5% to 3.0%, or the sum of silicon and aluminum content is 1.8% to 4.0%. The product is usually cold-rolled sheet or strip, its nominal thickness is 0.35 and 0.5mm, the low silicon chip contains silicon less than 2.8%, it has a certain mechanical strength, mainly used in the manufacture of electric motors and generators.

The grade of cold-rolled electrical steel is composed of English letters plus numbers, the letters indicate orientation or no orientation, the front number indicates the thickness of the steel (number /100), and the back number indicates the iron loss (number /100). For example, the grade of oriented steel is 30Q120, 30Q130, 30Q140, etc., and the grade of non-oriented steel is 50W470, 50W600, etc.