IEC 60404-8-5:2020
(Main)Magnetic materials - Part 8-5: Specifications for individual materials - Electrical steel strip and sheet with specified mechanical properties and magnetic polarization
Magnetic materials - Part 8-5: Specifications for individual materials - Electrical steel strip and sheet with specified mechanical properties and magnetic polarization
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.
General Information
Standards Content (Sample)
IEC 60404-8-5 ®
Edition 2.0 2020-08
INTERNATIONAL
STANDARD
Magnetic materials –
Part 8-5: Specifications for individual materials – Electrical steel strip and sheet
with specified mechanical properties and magnetic polarization
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IEC 60404-8-5 ®
Edition 2.0 2020-08
INTERNATIONAL
STANDARD
Magnetic materials –
Part 8-5: Specifications for individual materials – Electrical steel strip and sheet
with specified mechanical properties and magnetic polarization
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.030; 17.220.20 ISBN 978-2-8322-8747-7
– 2 – IEC 60404-8-5:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Classification . 8
5 Designation . 8
6 General requirements . 9
6.1 Production process . 9
6.2 Form of supply . 9
6.3 Delivery condition . 9
6.4 Surface condition . 10
6.5 Suitability for cutting . 10
6.6 Suitability for welding . 10
7 Technical requirements . 10
7.1 Mechanical properties . 10
7.2 Magnetic polarization . 10
7.3 Geometrical characteristics and tolerances . 12
7.3.1 Thickness . 12
7.3.2 Width . 14
7.3.3 Length . 14
7.3.4 Edge wave (wave factor) . 15
7.3.5 Residual curvature . 15
7.3.6 Edge camber . 16
7.4 Technological characteristics . 16
7.4.1 Density . 16
8 Inspection and testing . 16
8.1 General . 16
8.2 Selection of test samples . 17
8.3 Preparation of test specimens . 17
8.3.1 Mechanical properties . 17
8.3.2 Magnetic polarization . 17
8.3.3 Geometrical characteristics and tolerances . 18
8.4 Test methods . 18
8.4.1 General . 18
8.4.2 Mechanical properties . 18
8.4.3 Magnetic polarization . 18
8.4.4 Geometrical characteristics and tolerances . 18
8.5 Retests . 19
9 Marking, labelling and packaging . 19
10 Complaints . 19
11 Information to be supplied by the purchaser . 19
Table 1 – Mechanical and magnetic characteristics for hot-rolled grades . 11
Table 2 – Mechanical and magnetic characteristics for cold-rolled grades . 12
Table 3 – Tolerance on nominal thickness for hot-rolled grades . 13
Table 4 – Tolerance on nominal thickness for cold-rolled grades . 13
Table 5 – Maximum difference in thickness in a direction perpendicular to the direction
of rolling for hot-rolled grades . 13
Table 6 – Maximum difference in thickness in a direction perpendicular to the direction
of rolling for cold-rolled grades . 14
Table 7 – Tolerance on nominal width of products supplied with trimmed edges . 14
Table 8 – Tolerance on nominal length of sheets . 15
Table 9 – Maximum distance between the lower face of a test specimen and the flat
surface table for hot-rolled grades . 15
Table 10 – Maximum distance between the lower face of a test specimen and the flat
surface table for cold-rolled grades . 16
Table 11 – Minimum number of Epstein test strips . 17
– 4 – IEC 60404-8-5:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 8-5: Specifications for individual materials –
Electrical steel strip and sheet with specified mechanical
properties and magnetic polarization
FOREWORD
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International Standard IEC 60404-8-5 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.
This second edition cancels and replaces the first edition published in 1989. This edition
constitutes a technical revision.
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.
The text of this International Standard is based on the following documents:
CDV Report on voting
68/648/CDV 68/662/RVC
Full information on the voting for the approval of this International Standard can be
...
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