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

電工鋼硅鋼片近20年來(lái)，我國(guó)硅鋼產(chǎn)業(yè)取得了長(zhǎng)足的進(jìn)步，這其中以首鋼、四川內(nèi)江當(dāng)?shù)匚滗摵蛯氫摓榇怼５靡嬗谖覈?guó)鋼鐵行業(yè)全流程的技術(shù)進(jìn)步，這些企業(yè)在控制無(wú)取向硅鋼整體質(zhì)量穩(wěn)定性和取向硅鋼方面已經(jīng)具有較高技術(shù)實(shí)力。2014年我國(guó)硅鋼生產(chǎn)達(dá)到823萬(wàn)噸，高端產(chǎn)品有20~30萬(wàn)噸的進(jìn)口量，2015年，我國(guó)共生產(chǎn)電工鋼約836萬(wàn)噸，進(jìn)口量進(jìn)一步下降到14萬(wàn)噸。但是，與日本相比我國(guó)在高端電工鋼領(lǐng)域仍有不小的差距，這集中體現(xiàn)在高磁感無(wú)取向硅鋼、四川內(nèi)江當(dāng)?shù)爻丸F損Hi-B取向硅鋼和高硅鋼等產(chǎn)品上。例如，新日鐵公司(現(xiàn)新日鐵住金)能夠?qū)崿F(xiàn)0.15~0.35mm系列厚度規(guī)格極低鐵損Hi-B取向電工鋼的穩(wěn)定供貨，引領(lǐng)取向硅鋼工藝發(fā)展。在特殊用途硅鋼方面，日本鋼管公司(現(xiàn)JFE)通過(guò)氣相沉積法(CVD)滲硅的方式實(shí)現(xiàn)了高硅鋼薄帶的供貨。隨著我國(guó)裝備制造業(yè)的產(chǎn)業(yè)升級(jí)，高端硅鋼產(chǎn)品的需求會(huì)越來(lái)越迫切。我國(guó)與日韓等鋼鐵強(qiáng)國(guó)在這一領(lǐng)域的競(jìng)爭(zhēng)將會(huì)更加激烈，這就要求我國(guó)相關(guān)科研人員通過(guò)革命性創(chuàng)新進(jìn)行下一代硅鋼生產(chǎn)技術(shù)的研發(fā)，引領(lǐng)世界電工鋼技術(shù)的發(fā)展。低鐵損、四川內(nèi)江當(dāng)?shù)馗叽鸥须姍C(jī)用無(wú)取向硅鋼、四川內(nèi)江當(dāng)?shù)乇∫?guī)格超低鐵損高磁感取向硅鋼和中高頻節(jié)能電器用高硅鋼是電工鋼產(chǎn)業(yè)的發(fā)展方向。