電工鋼硅鋼片：用 25cm 愛潑斯坦方圈測量時，參照檢測方法 GB/T 3655（IEC 60404-2，IDT）,一副試樣由不少于24 片的樣片組成。試樣的長度方向應沿平行于產(chǎn)品軋制方向切取，試樣長度方向與產(chǎn)品軋制方向的偏離角度應在±1 以內(nèi)，試樣應盡可能覆蓋產(chǎn)品的全板寬范圍。試樣應的取樣方法、青海海東附近尺寸及允許偏差應符合 GB/T 3655 的規(guī)定。測試前，試樣應在制造方提供的條件下進行應力退火處理。測試產(chǎn)品時效試樣的 比總損耗時，時效試樣應在 225℃±5℃溫度中持續(xù)保溫 24h，然后空冷到環(huán)境溫度。8.5.2 單片法（SST）測量用單片測試儀測量時，試樣的取樣方法、青海海東附近尺寸及允許偏差應符合 GB/T 13789（IEC 60404-3，IDT)）的規(guī)定。為保證磁性測試結果對帶鋼磁性能的代表性，裁剪大單片試樣時，試樣沿縱向的中心線位置與產(chǎn)品寬度方向中心位置偏移量應≤50mm，試樣縱向與樣板軋制方向的偏離角度應在±1 以內(nèi)。單片法測量的試樣不需要應力退火處理，也不允許進行時效測試。

電工鋼硅鋼片Electrical steel, also known as silicon steel sheet, is an indispensable metal material in the power, electronics, and military industries, and is also the largest functional material in production. It is mainly used as the iron core for various motors, generators, and transformers. Specific total loss (iron loss) is the total power consumed per unit mass of material when the magnetic polarization waveform remains sinusoidal, with a specific peak and frequency. The specific total loss is represented by the symbol P (Jm/f), in W/kg. Example: P1.5/50 represents the specific total loss at a maximum magnetic polarization intensity of 1.5T and a frequency of 50Hz. 3.2 Magnetic Polarization Q/BQB 480-20212 Magnetic polarization intensity refers to the peak magnetic polarization intensity of a specific magnetic field intensity when a sample is subjected to alternating magnetization. Its symbol is J (H), and the unit is T (Tesla). Example: J5000 represents the peak magnetic polarization intensity corresponding to a magnetic field intensity peak of 5000A/m. The material grades in this document are classified based on the nominal maximum specific total loss P1.5/50 (W/kg) at a magnetic polarization strength of 1.5T and a frequency of 50Hz, as well as the nominal thickness of the material. They are further divided into three categories based on product characteristics: ordinary type, stress relief annealing type, and high-efficiency type. Example 1: B35A210 represents a common non oriented electrical steel with a nominal thickness of 0.35mm, and the maximum nominal specific total loss value P1.5/50 is 2.10W/kg； Example 2: B35AR300 represents a stress relieved annealed non oriented electrical steel with a nominal thickness of 0.35mm, and the maximum nominal specific total loss value P1.5/50 is 3.00W/kg； Example 3: B35AH230 represents an efficient non oriented electrical steel with a nominal thickness of 0.35mm, and the maximum nominal specific loss value P1.5/50 is 2.30W/kg. Example 4: 35WW210 represents a normal type WW non oriented electrical steel with a nominal thickness of 0.35mm, and the maximum nominal specific loss value P1.5/50 is 2.10W/kg. Example 5: 35WH230 represents an efficient WH non oriented electrical steel with a nominal thickness of 0.35mm, and the maximum nominal specific loss value P1.5/50 is 2.30W/kg. The classification and code of insulation coatings shall comply with the provisions of Table 2. Table 2 Classification and Code of Insulation Coatings Type Code Characteristics of Insulation Coatings Semi organic Thin Coating A Improves Punching Performance and Has Good Weldability Semi organic Thick Coating H has Good Punching Performance and High Interlayer Resistance Semi organic Chromium Free Thin Coating K does not contain chromium and has good weldability Semi organic Chromium Free Thick Coating M does not contain chromium and has good insulation performance Semi organic Chromium Free Extreme Thick Coating J does not contain chromium and has excellent insulation performance Semi organic Chromium Free Ultra Thick Coating L does not contain chromium and has extremely high insulation performance Self adhesive Coating