上海钢材加工B35A270

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：绝缘涂层状态产品通常以两面涂敷绝缘涂层状态交货，涂层种类见表 2。绝缘涂层应可耐受绝缘漆、江西新余本地变压器油、江西新余本地机械油等介质的侵蚀。本文件规定的绝缘涂层与国内外相关技术规范规定绝缘涂层的近似对照可参见附录 A(资料性附录)，绝缘涂层的特性见附录 B(资料性附录)。绝缘涂层的厚度、江西新余本地自粘接涂层的剥离强度等技术要求如有特殊要求应在订货时协商，并在合同中注明。7.3.2 绝缘涂层附着性根据附录 C（无取向电工钢绝缘涂层附着性检测和评级方法），产品的绝缘涂层的附着性按照由高至低分为 A、江西新余本地B、江西新余本地C、江西新余本地D 四个级别。供货时，产品涂层的附着性级别 应达到 C 级。在剪切过程和供方规定的热处理条件下进行热处理时，涂层不得有大面积脱落，但是在剪切边缘位置，涂层的轻微碎裂则允许存在。7.3.3 涂层绝缘电阻涂层绝缘电阻分为表面绝缘电阻和层间电阻，表面绝缘电阻单位为Ω·cm2/面，层间电阻单位为Ω·cm2/片，理论上，层间电阻是表面绝缘电阻的 2 倍。根据需方要求，经供需双方协商，可进行涂层绝缘电阻的检测，并在合同中注明涂层表面绝缘电阻或层间电阻的小值。