IEC 60404-8-3:20 23定义了以半加工状态交付的标称厚度为0.47 mm、0.50 mm、0.64 mm、0.65 mm和0.79 mm的冷轧无取向电工钢带和板材的等级。它给出了一般要求、磁性能、几何特性、公差和技术特性以及检验程序。0.47 mm、0.64 mm和0.79 mm的标称厚度适用于仅在60 Hz下使用的等级。 本文件适用于以半加工状态（即未经最终热处理）交付的冷轧无取向电工钢带和板材，以线圈或板材的形式，用于构建磁路。本文件不适用于完全加工状态下供应的物料。 这些材料分别对应于IEC 60404的B2和C21类-1. 与上一版相比，此版本包括以下重大技术变更: a)修改有关几何特征的术语和技术要求，以符合IEC 60404-9:20 18； b)插入表3–标称厚度公差； c)用于确定几何特性的测试样本的长度从2m改变为1m； d)删除带有欧洲钢材编号系统的附件A。

IEC 60404-8-3:2023 defines the grades of cold-rolled non-oriented electrical steel strip and sheet delivered in the semi-processed state in nominal thicknesses of 0,47 mm, 0,50 mm, 0,64 mm, 0,65 mm and 0,79 mm. It gives general requirements, magnetic properties, geometric characteristics, tolerances and technical characteristics as well as inspection procedures. The nominal thicknesses of 0,47 mm, 0,64 mm and 0,79 mm apply to the grades for use at 60 Hz only.
This document applies to cold-rolled non-oriented electrical steel strip and sheet delivered in the semi-processed state, i.e. without final heat treatment, in coils or sheets, and intended for the construction of magnetic circuits. This document does not apply to materials supplied in the fully-processed state.
These materials correspond respectively to classes B2 and C21 of IEC 60404-1.
This edition includes the following significant technical changes with respect to the previous edition:
a) Modification of terms and technical requirements concerning geometrical characteristics to be consistent with IEC 60404-9:2018;
b) Insertion of Table 3 – Tolerances on nominal thickness;
c) Change of the length of the test specimen for determination of geometrical characteristics from 2 m to 1 m;
d) Deletion of Annex A with the European numerical system of designation of steels.