IEC 60404-8-5:20 20(E)定义了具有特定机械性能和磁极化的电工钢带和板材的等级。特别是，它给出了一般要求、机械性能、磁极化、几何特性、公差和工艺特性，以及检验程序。 本文件适用于用于制造旋转电机的电杆和轮辋的电工钢带和钢板。 这些等级根据其制造工艺分为两类: -热轧等级； -冷轧等级。 它们对应于IEC 60404-1的D21级。 与上一版相比，此版本包括以下重大技术变更: a)扩大产品范围以包括改进的等级；b)根据IEC 60404-9将“平坦度”分为“边缘波浪(波浪因子)”和“残余曲率”； c)将用于确定几何特征的试样长度从2 m改为1 m。

IEC 60404-8-5:2020(E) defines the grades of electrical steel strip and sheet with specified mechanical properties and magnetic polarization. In particular, it gives general requirements, mechanical properties, magnetic polarization, geometric characteristics, tolerances and technological characteristics, as well as inspection procedures.
This document applies to electrical steel strip and sheet intended for the construction of poles and rims of rotating electrical machines.
The grades are grouped into two classes according to their manufacturing process:
- hot-rolled grades;
- cold-rolled grades.
They correspond to Class D21 of IEC 60404-1.
This edition includes the following significant technical changes with respect to the previous edition:
a) extension of the range of products to include the improved grades;
b) division of "flatness" into "edge wave (wave factor)" and "residual curvature" in consistent with IEC 60404-9;
c) change length of test specimen for determinations of geometrical characters from 2 m to 1 m.