Magnetic materials - Part 9: Methods of determination of the geometrical characteristics of electrical steel strip and sheet

IEC？60404-9:2018 specifies the measurement and test methods for the determination of the following geometrical characteristics of electrical steel strip and sheet:

–？？？ edge wave (wave factor);

–？？？ residual curvature;

–？？？ edge camber;

–？？？ deviation from the shearing line (internal stress);

–？？？ burr height.

This document applies to electrical steel strip and sheet intended for the construction of magnetic circuits and corresponding to Classes B2, C21, C22 and C23 of IEC？60404-1.

This edition includes the following significant technical changes with respect to the previous edition:

a. revision of terms and definitions;

b. specification of the length of test specimens for the determinations of edge wave (wave factor) and edge camber;

c. addition of the horizontal method for the determination of residual curvature, and a note that informs about a safety concern of the vertical method;

d. clarification that the burr height was characterized by the maximum value;

e. addition of the measuring procedure using a hand-held micrometer to determine the burr height.