電工鋼硅鋼片本文件按照 GB/T 1.1—2020《標準化工作導則 部分：標準化文件的結構和起草規則》的規定起草。本文件參考 IEC 60404-8-8:2017 進行編制。本文件代替 Q/BQB 481－2018。本文件與 Q/BQB 481－2018 相比，主要修改內容如下：——新增高強度型 AHV-M 產品；——新增高強度型 AHS 產品；——刪除表 2 半有機無鉻極厚涂層；——新增表 3 高強度型、高強度型二類產品磁性能和技術特性；——新增表 3 0.25mm 厚度規格產品；——刪除表 3 型 B15AHV1000、B35AHV1900 牌號產品、高磁感型 B35APV1900 牌號產品；——新增表 3 高磁感型 B15APV1000、B20APV1200 牌號產品；——提高了表 3 部分牌號產品的磁極化強度標準；——新增表 4 高強度型和高強度型二類產品的力學性能標準；——修改絕緣涂層附著性評價級別代碼；——加嚴了表 5 縱向厚度偏差標準；——加嚴了不平度標準；——刪除內應力檢測項目；——附錄 A 刪除了半有機無鉻極厚涂層；——修訂了附錄 B；——修訂附錄 D 部分牌號產品的磁性能和力學性能典型值；——新增附錄 D 高強度型和高強度型二類產品的磁性能和力學性能典型值；——修訂附錄 F 本文件與寶鋼股份原薄規格牌號對照表

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