IEC 60404-8-5:2020 PDF

Overview

IEC 60404-8-5:2020 - Magnetic materials - Part 8-5: Specifications for individual materials - Electrical steel strip and sheet with specified mechanical properties and magnetic polarization - defines standardized grades and requirements for electrical steel strip and sheet used primarily in the poles and rims of rotating electrical machines. The standard sets out mechanical properties, magnetic polarization, geometrical characteristics, tolerances, technological characteristics and inspection procedures for both hot‑rolled and cold‑rolled grades (Class D21 of IEC 60404‑1).

Key technical updates in the 2020 edition:

• Inclusion of improved grades.
• Splitting of flatness into edge wave (wave factor) and residual curvature, aligning with IEC 60404‑9.
• Reduction of the test specimen length for geometrical determinations from 2 m to 1 m.

Key Topics and Requirements

• Classification and designation of hot‑rolled and cold‑rolled electrical steel strip and sheet.
• General requirements covering production process, form of supply, delivery condition and surface state.
• Mechanical properties: specified proof strength and tensile characteristics (as applicable to design and manufacturability).
• Magnetic polarization: defined magnetic performance parameters and test methods.
• Geometrical characteristics and tolerances: thickness, width, length, edge wave (wave factor), residual curvature, edge camber and related tolerance tables.
• Technological characteristics: e.g., density and suitability for cutting and welding.
• Inspection and testing: sampling, specimen preparation, test methods (references include Epstein frame methods in IEC 60404‑2 and d.c. measurements in IEC 60404‑4), retest rules and documentation.
• Marking, labelling, packaging and purchaser information requirements.

Applications and Who Uses This Standard