电工钢，又名硅钢、硅钢，是一种特种钢，可以表现出一些特殊的磁性，比如制造出一个磁滞区域、增加磁导率、减小磁芯损耗。

电工钢通常以冷轧方式制造，厚度一般小于2毫米。多片电工钢通常会被压成叠片，用于变压器和电动机中的定子和转子的磁芯。电工钢在压成叠片后通常会用凹凸模、激光或电火花加工切割成形。

Electrical steel, also called lamination steel, silicon electrical steel, silicon steel, relay steel or transformer steel, is specialty steel tailored to produce certain magnetic properties, such as a small hysteresis area (small energy dissipation per cycle, or low core loss) and high permeability.