GB/T 13888-2024 Active

This document describes the method of measuring the coercivity of magnetic materials in an open magnetic circuit.
This document is applicable to magnetic materials with coercivity ranging from 0.2 A/m to 160 kA/m.
Note: The magnetic materials in this document include soft magnetic materials (such as iron, low-carbon steel, silicon steel, other steels, nickel-iron alloys, iron-cobalt alloys, soft magnetic materials made by powder metallurgy technology, amorphous soft magnetic materials, and nanocrystalline soft magnetic materials) and hard magnetic materials (such as magnetostrictive alloys, permanent (hard) magnetic alloys, permanent (hard) magnetic ceramics, other permanent (hard) magnetic materials, and bonded (hard) magnetic materials)[2].
For measurements of coercivity lower than 40 A/m, high-conductivity materials, and non-elliptical samples, special measures in Appendix A are used.