Silicon steel sheet is a kind of silicon iron soft magnetic alloy with very low carbon content. Generally, the silicon content is 0.5 ~ 4.5%. Adding silicon can improve the resistivity and maximum permeability of iron, and reduce coercivity, core loss (iron loss) and magnetic aging. It is mainly used to make iron cores of various transformers, motors and generators. Today, Alisa, the sales manager of hengfengyou Electric Co., Ltd., will show you the performance indexes of silicon steel sheets:
Generally, with the increase of silicon content, iron loss, punching property and magnetic induction decrease, and hardness increases. The higher the operating frequency, the greater the eddy current loss, and the thinner the silicon steel sheet should be selected.
1. Low iron loss of silicon steel sheet is required:
The low iron loss of silicon steel sheet is an important indicator of the quality of silicon steel sheet. The iron loss of silicon steel sheet is determined according to different grades of silicon steel sheet. If the grade is higher, the iron loss value will be lower.
2. High magnetic sensitivity of silicon steel sheet is required:
In the motor, the silicon steel sheet as the iron core plays a great role in its operation, but different silicon steel sheets have different magnetic induction strength. We need to choose the silicon steel sheet with good magnetic induction strength as the material.
3. The surface of silicon steel sheet shall be smooth, flat and uniform in thickness:
The performance of silicon steel sheet can be judged from the surface texture.
4. Silicon steel sheet is required to have good adhesion and weldability:
In the process of processing and using silicon steel sheet, the adhesion of silicon steel sheet to insulating film is good for anti-corrosion and improving the punching performance of silicon steel sheet.
Summary: the iron loss of silicon steel sheet is a concern of hengfengyou transformer manufacturers and motor manufacturers. According to China's industrial standard (GB / 3655-2008), Epstein square ring or standard magnetic conductivity meter (500sst / 1000sst) is used as the basis for inspection and evaluation of iron loss of silicon steel sheet. This method is also recommended by international IEC standards and national standards.
The quality of silicon steel sheet depends on the material and processing technology of silicon steel sheet, which directly affects the quality of transformer. The stamping method and annealing method in the processing technology are the most important. The performance of transformer made of silicon steel sheet of the same material with small stamping burr and large burr is 7%, and the silicon steel sheet of the same material retreats (nitrogen protection annealing) The performance of the transformer is 7-10% different from that of the transformer made of non annealed silicon steel sheet.
In addition, the comparison of properties and grades of Chinese silicon steel sheets in 2019 is attached
The H series number commonly used in China is the label of Nippon Steel from 1970s to 1990s. Now regular manufacturers are marked according to the new label.
The performance of old label and new label is equivalent to the price of materials in 2019
H12 50h270 50ww270 b50a270 21000 yuan
H14 50h310 50ww310 b50a310 15800 yuan
H18 50h470 50ww470, b50a470 14000 yuan
H23 50h600, 50ww600, b50a600, 12600 yuan
H30, 50h700, 50ww700, b50a700, 11000 yuan
H40, 50h800, 50ww800, b50a800 9600 yuan
H50, 50h1000, 50ww1000, b50a1000, 8500 yuan
H60, 50h1300, 50ww1300, b50a1300, 8000 yuan
(annealing sheet costs 1000-2000 M / T)
In terms of technology, Z series are cold rolled with oriented high silicon content, H series are generally cold rolled with non oriented medium and high silicon content, and H-type non oriented steel sheets also have 0.35mm thin sheets. However, the output is very small, and it is generally used in occasions with high requirements.
Non oriented silicon steel sheets are commonly used as follows:
H50 H23 H18 H14 H12
Specific gravity 7.85 7.75 7.65 7.65 7.65
Iron loss P1.5 / 50Hz ≤ 13 6.2 4.7 4.0 3.6
Magnetic flux density B50 ≥ 1.69 1.66 1.64 1.61 1.6
(in terms of temperature rise, h18 is lower than H23, H23 is lower than H50, and the opposite is true according to no-load current. In addition, the same brand can be divided into white and black, and the performance of black annealed sheet is better than that of white sheet. In addition, the performance is different with different sizes of iron cores of the same brand.)
Common grades of oriented silicon steel strips are:
Z11 Z10
Specific gravity 7.65
Iron loss p1.7/50 ≤ 1.66 1.51
Flux density B10 ≥ 1.74 1.77
JFE Japan (old Kawasaki):
35jn250 (0.35mm thick, iron loss between 2.18 ~ 2.26, magnetic induction above 1.69)
50jn270 (0.50mm thick, iron loss between 2.38 ~ 2.42, magnetic induction above 1.68)
50jn290 (0.50mm thick, iron loss between 2.46 ~ 2.51, magnetic induction above 1.68)
50jn310 (0.50mm thick, iron loss between 2.50 ~ 2.54, magnetic induction above 1.69)
Nippon Steel:
50h270 (0.50mm thick, iron loss between 2.37 ~ 2.41, magnetic induction above 1.68)
50h290 (0.50mm thick, iron loss between 2.46 ~ 2.50, magnetic induction above 1.68)
50h310 (0.50mm thick, iron loss between 2.49 ~ 2.53, magnetic induction above 1.69)
TISCO:
50tw290 (0.50mm thick, iron loss between 2.54 ~ 2.60, magnetic induction above 1.68)
50tw310 (0.50mm thick, iron loss between 2.64 ~ 2.69, magnetic induction above 1.68)
50tw350 (0.50mm thick, iron loss between 2.70 ~ 2.76, magnetic induction above 1.69)
Chinese brand representation:
(1) Cold rolled non oriented silicon steel strip (sheet)
Expression method: DW + 100 times of iron loss value (at the frequency of 50Hz, the magnetic induction peak with sinusoidal waveform is the unit weight iron loss value of 1.5T) + 100 times of thickness value. For example, dw470-50 represents cold-rolled non oriented silicon steel with iron loss value of 4.7w/kg and thickness of 0.5mm. Now the new model is 50W470.
(2) Cold rolled oriented silicon steel strip (sheet)
Expression method: 100 times of DQ + iron loss value (at the frequency of 50Hz, the magnetic induction peak with sinusoidal waveform is the unit weight iron loss value of 1.7t) + 100 times of thickness value. Sometimes G is added after the iron loss value to indicate high magnetic induction. For example, dq133-30 represents cold rolled oriented silicon steel strip (sheet) with iron loss value of 1.33 and thickness of 0.3mm. Now the new model is 30q133.
(3) Hot rolled silicon steel plate
Hot rolled silicon steel plate is represented by Dr, which is divided into low silicon steel (silicon content ≤ 2.8%) and high silicon steel (silicon content > 2.8%).
Expression method: Dr + 100 times of iron loss value (iron loss value per unit weight when the maximum magnetic induction intensity with 50Hz repeated magnetization and sinusoidal variation is 1.5T) + 100 times of thickness value. For example, dr510-50 represents hot-rolled silicon steel plate with iron loss value of 5.1 and thickness of 0.5mm.
The grade of hot rolled silicon steel sheet for household appliances is expressed by JDR + iron loss value + thickness value, such as jdr540-50.
2. Japanese brand representation:
(1) Cold rolled non oriented silicon steel strip
From the nominal thickness (expanded by 100 times) + code a + iron loss guarantee value (the value after expanding the iron loss value when the frequency is 50Hz and the maximum magnetic flux density is 1.5T by 100 times). For example, 50a470 represents cold-rolled non oriented silicon steel strip with thickness of 0.5mm and iron loss guarantee value ≤ 4.7.
(2) Cold rolled oriented silicon steel strip
Nominal thickness (expanded by 100 times) + code G: ordinary material, P: high orientation material + iron loss guarantee value (the value after expanding the iron loss value when the frequency is 50Hz and the maximum magnetic flux density is 1.7t by 100 times). For example, 30g130 represents cold-rolled oriented silicon steel strip with thickness of 0.3mm and iron loss guarantee value ≤ 1.3.
