Chinese silicon steel grade representation method

Chinese silicon steel grade representation method

(1) Cold-rolled non-oriented silicon steel strip (sheet)
Expression method: DW+ iron loss value (at the frequency of 50HZ, waveform is sinusoidal magnetic induction peak value of 1.5T iron loss per unit weight.) 100 times the thickness + 100 times the thickness value.
For example, DW470-50 means that the iron loss value is 4.7w/kg and the thickness is 0.5mm of cold-rolled non-oriented silicon steel, and the new model is 50W470.
(2) Cold-rolled oriented silicon steel strip (sheet)
Expression method: DQ+ iron loss value (at the frequency of 50HZ, waveform is sinusoidal magnetic induction peak value of 1.7T iron loss per unit weight.) 100 times the thickness + 100 times the thickness value. Sometimes G is added after the iron loss value to indicate high magnetic induction.
For example, DQ133-30 indicates a cold-rolled oriented silicon steel strip (sheet) with an iron loss of 1.33 and a thickness of 0.3mm, and the new model is 30Q133.
(3) Hot rolled silicon steel plate
Hot-rolled silicon steel plate is expressed by DR, and is divided into low silicon steel (silicon content ≤2.8%) and high silicon steel (silicon content > 2.8%) according to the silicon content.
Expression method: DR+ iron loss value (50HZ repeated magnetization and sinusoidal variation of the maximum value of the iron loss per unit weight of 1.5T) + 100 times the thickness value. For example, DR510-50 indicates a hot-rolled silicon steel plate with an iron loss of 5.1 and a thickness of 0.5mm.
The brand of hot-rolled silicon steel sheet for household appliances is expressed by JDR+ iron loss value + thickness value, such as JDR540-50
Hardware knowledge: Silicon steel sheet
Electrical silicon steel sheet commonly known as silicon steel sheet or silicon steel sheet. As the name suggests, it is an electrical silicon steel containing up to 0.8%-4.8% silicon, which is made by hot and cold rolling. Generally, the thickness is less than 1mm, so it is called thin plate. Silicon steel sheet in a broad sense belongs to the plate class, because of its special use and independent branch.
Silicon steel sheet for electrical engineering has excellent electromagnetic properties and is an indispensable magnetic material in the electric power, telecommunications and instrument industries.

(1) Classification of silicon steel sheet
A, silicon steel sheet according to its silicon content can be divided into low silicon and high silicon two. Low silicon contains less than 2.8% silicon, it has a certain mechanical strength, mainly used in the manufacture of motor, commonly known as motor silicon steel sheet; High silicon silicon content of 2.8%-4.8%, it has good magnetism, but more brittle, mainly used in the manufacture of transformer core, commonly known as transformer silicon steel sheet. There is no strict boundary between the two in actual use, and large motors are commonly manufactured with high silicon wafers. B, according to the production process can be divided into hot rolling and cold rolling two, cold rolling can be divided into grain orientation and grain orientation two. The cold-rolled sheet has uniform thickness, good surface quality and high magnetism, therefore, with the development of industry, the hot-rolled sheet has the trend of being replaced by the cold-rolled sheet (China has clearly required to stop using the hot-rolled silicon steel sheet, that is, the "cold instead of hot" said in the early stage).
(2) Performance index of silicon steel sheet
A. Low iron loss. The most important indicator of quality, all countries in the world are divided by the iron loss value, the lower the iron loss, the higher the brand, the higher the quality.
B, high magnetic induction. Under the same magnetic field, the silicon steel sheet can be obtained with high magnetic induction, and the volume and weight of the motor or transformer core made by it is small, which can save silicon steel sheet, copper wire and insulating materials. C, high stacking coefficient. The surface of the silicon steel sheet is smooth, flat and uniform in thickness, and the stacking coefficient of the manufacturing iron core is improved.
D, good film performance. This is more important for the manufacture of small and micro motor cores.
E, the surface of the insulation film adhesion and weldability is good.
F, magnetic aging
G. The silicon steel sheet shall be delivered after annealing and pickling.