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电工钢硅钢片：密度用于计算磁性能和叠装系数的约定密度为 7.65×103 kg/m3。7.4.2 叠装系数产品的小叠装系数应符合表 3、山东威海同城表 4、山东威海同城表 5、山东威海同城表 6、山东威海同城表 7、山东威海同城表 8 和表 9 的规定。7.4.3 弯曲次数产品平行于轧制方向的小弯曲次数应不小于 1 次。供方如能保证，可不进行该试验。7.4.4 由内应力引起的剪切边的偏差产品应尽可能量避免出现内应力。根据需方要求，并在合同中注明，可对宽度不小于 500mm 的材料（纵切分条后的材料）检测由内应力引起的剪切边偏差，其缝隙测量值应不超过 1mm。供方如能保证，可不进行该试验。8 检验和试验8.1 一般要求8.1.1 按本文件签订订货协议时，用户可按GB/T 17505规定进行规定检验和试验或非规定检验和试验。然而，对于非规定检验和试验，制造方应提供所需产品的比总损耗值和磁极化强度值。8.1.2 当按规定检验和试验订货时，用户应明确 GB/T 18253 中的检验文件的类型。

电工钢硅钢片In addition to the types listed above, there are also some special purpose electrical steel plates, such as 0.15 and 0.20mm thick 3％ Si cold-rolled non oriented silicon steel strips and 0.025, 0.05, and 0.1mm thick 3％ Si cold-rolled oriented silicon steel strips, used for medium and high-frequency motors, transformers, and pulse transformers； 0.7mm thick 3％ Si high-strength cold-rolled non oriented silicon steel plate for relays and power switches； High strength cold-rolled electrical steel plate for new high-speed motor rotors； Low carbon electrical steel hot-rolled thick and cold-rolled plates for magnetic shielding and high-energy accelerator electromagnets such as medical magnetic resonance tomography scanners； 4.5％ to 6.5％ Si high silicon steel plates for high-frequency motors, transformers, and magnetic shielding.Generally, motors, transformers, and other electrical components are required to have high efficiency, low power consumption, small size, and light weight. Electrical steel plates are usually guaranteed to have magnetic properties based on core loss and magnetic induction strength [1] [2]. The requirements for the performance of electrical steel plates are as follows:Low core loss (PT)Iron core loss refers to the ineffective electrical energy consumed by an iron core when magnetized in an alternating magnetic field of ≥ 50Hz, abbreviated as iron loss, also known as alternating loss, and its unit is W/kg. The ineffective electrical energy consumed due to various obstacles caused by magnetic flux changes not only loses electrical energy through the heating of the iron core, but also causes temperature rise of the motor and transformer. The iron loss (PT) of electrical steel includes three parts: hysteresis loss, eddy current loss (Pe), and anomalous loss (Pa). Electrical steel plates have low iron loss, which can save a lot of electricity, prolong the operating time of motors and transformers, and simplify cooling devices. Due to the iron loss of electrical steel plates, which accounts for 2.5％ to 4.5％ of the annual electricity generation in various countries, countries always try their best to reduce iron loss in the production of electrical steel plates, and use iron loss as the most important indicator to assess the magnetic properties of products. The iron loss value of products is used as the basis for classifying product grades. Cold rolled oriented electrical steel: Cold rolled oriented electrical steel is a high-end product in the field of electrical steel. Compared with cold rolled non oriented electrical steel, its magnetism has strong directionality； It has superior high magnetic permeability and low loss characteristics in the direction of easy magnetization rolling. The iron loss of oriented steel strip in the rolling direction is only 1/3 of that in the transverse direction, and the ratio of magnetic permeability is 6:1. Application: The main purpose of cold-rolled oriented silicon steel strip is for transformer manufacturing.Full process cold rolled non oriented silicon steel coating: The surface of the full process cold rolled silicon steel is coated with a semi transparent insulation coating, which has different codes in different standards. Taking Baosteel‘s Q/BQB 480 2014 as an example:

电工钢硅钢片应力退火电工钢在剪切、山东威海同城冲片和弯曲加工等机械变形作用下，电磁性能将发生劣化。为此进行应力退火，可以使电工钢的电磁性能恢复至原来水平。应力退火的条件和工艺将根据加工程度、山东威海同城退火炉况等有明显不同，用户务必注意如下几点：(1) 加热与冷却速度电磁性能一般不受加热和冷却速度的影响，但用户需确保材料不变形。(2)退火温度与保温时间取向电工钢退火温度在780-820℃之间较为适宜，为确保退火效果，退火材料应均热的保持，保温时间应根据铁芯形状、山东威海同城装炉量等进行调整。(3)防止渗碳与氧化由于渗碳及氧化会使电磁性能劣化，用户应充分注意炉内气体，并确保炉内气体的露点在较低状态。另外，为防止在退火中发生渗碳，应该在退火前，将铁芯加工过程中润滑油脂等有机化合物干净。同时，为确保退火效果，建议与炉内高温接触部分尽量采用低碳含量材料。有害物质限定承诺 宝钢的取向电工钢产品符合RoHS、山东威海同城REACH有害物质限定要求。