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

電工鋼硅鋼片單取向電工鋼指Goss取向，雙取向特指立方取向電工鋼。后者制備工藝極為復(fù)雜，目前難以工業(yè)化，所以取向硅鋼廣泛意義上指Goss取向。取向硅鋼在易磁化的方向上具有高磁導(dǎo)率與低損耗特性，符合變壓器等靜態(tài)電力裝備的導(dǎo)磁能力要求。單取向硅鋼根據(jù)抑制劑和磁感的不同又可以分為CGO鋼和Hi-B鋼，具體如表1所示。其中，CGO鋼的晶粒平均取向偏離角約為7°，飽和磁感值B8在1.82Tesla以上，主要用于中小型變壓器的制造。Hi-B鋼的晶粒平均取向偏離角約為3°，B8值在1.90Tesla以上，主要用于電力工業(yè)中的各種大型變壓器、廣西桂林同城扼流圈等高端電磁元件的制造。

電工鋼硅鋼片：取樣應(yīng)從每一個驗收組批上切取。8.2.2 產(chǎn)品的內(nèi)圈和外圈應(yīng)視為包裝材，不代表整個鋼卷的質(zhì)量，試樣不應(yīng)從這部分截取。試樣應(yīng)避開焊縫和接帶區(qū)域。8.2.3 取樣位置距產(chǎn)品頭尾兩端不小于 3m，距產(chǎn)品邊部不小于 15mm 處截取。對大單片磁性能、廣西桂林同城絕緣涂層附著性等有特殊取樣要求的檢測項目，則按照附錄 A 的規(guī)定取樣。8.2.4 通過合理地安排測試順序，同一副試樣可以用于測試多種特性。8.3 表面外觀檢查產(chǎn)品的表面外觀質(zhì)量用肉眼檢查。8.4 尺寸和外形的測量8.4.1 尺寸和外形應(yīng)采用合適的測量工具測量。測量位置距產(chǎn)品頭尾兩端不小于 3m。8.4.2 厚度的測量切邊鋼帶的厚度應(yīng)在距邊部不小于 15mm 的任意位置處測量。測量所采用的千分尺精度應(yīng)為0.001mm。8.4.3 不平度(波浪度)的測量