IEC 60404-8-7:2008

Magnetic materials - Part 8-7: Specifications for individual materials - Cold-rolled grain-oriented electrical steel strip and sheet delivered in the fully-processed state

IEC 60404-8-7:2008 defines the grades of cold-rolled grain-oriented electrical steel strip and sheet in nominal thicknesses of 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm. In particular, it gives general requirements, magnetic properties, geometric characteristics, tolerances and technological characteristics, as well as inspection procedures. This standard applies to Goss textured grain-oriented electrical steel strip and sheet supplied in the final annealed condition in sheets or coils, and intended for the construction of magnetic circuits. The grades are grouped into two classes:
- conventional grades;
- high permeability grades.
They correspond to Class C.22 of IEC 60404-1. This third edition cancels and replaces the second edition published in 1998 of which it constitutes a technical revision. This revision extends the range of electrical steels to include the improved grades.

Matériaux magnétiques - Partie 8-7: Spécifications pour matériaux particuliers - Bandes et tôles magnétiques en acier à grains orientés, laminées à froid et livrées à l'état fini

La CEI 60404-8-7:2008 définit les qualités de bandes et tôles magnétiques laminées à froid, en acier à grains orientés de 0,23 mm, 0,27 mm, 0,30 mm et 0,35 mm d'épaisseur nominale. Elle donne en particulier les exigences générales, les caractéristiques magnétiques, les caractéristiques géométriques et les tolérances, les caractéristiques technologiques ainsi que les procédures de contrôle. La présente norme est applicable aux bandes et tôles magnétiques en acier à grains orientés, à texture de Goss, livrées après recuit final en feuilles ou en bobines et destinées à la construction de circuits magnétiques. Les qualités sont groupées en deux classes:
- qualités conventionnelles;
- qualités à haute perméabilité.
Elles correspondent à la Classe C.22 de la CEI 60404-1. Cette troisième édition annule et remplace la deuxième édition parue en 1998, dont elle constitue une révision technique. Cette révision étend la gamme d'aciers magnétiques afin d'inclure les qualités améliorées.

General Information

• Status: Published
• Publication Date: 20-May-2008
• ICS: 29.030 - Magnetic materials
• Technical Committee: TC 68 - Magnetic alloys and steels
• Drafting Committee: JWG 1 - TC 68/JWG 1
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 15-Sep-2017

Relations

• Revised: IEC 60404-8-7:2017 - Magnetic materials - Part 8-7: Specifications for individual materials - Cold-rolled grain-oriented electrical steel strip and sheet delivered in the fully processed state
• Effective Date: 05-Sep-2023
• Revises: IEC 60404-8-7:1998 - Magnetic materials - Part 8-7: Specifications for individual materials - Cold-rolled grain-oriented electrical steel sheet and strip delivered in the fully-processed state
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60404-8-7
Edition 3.0 2008-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 8-7: Specifications for individual materials – Cold-rolled grain-oriented
electrical steel strip and sheet delivered in the fully-processed state

Matériaux magnétiques –
Partie 8-7: Spécifications pour matériaux particuliers – Bandes et tôles
magnétiques en acier à grains orientés, laminées à froid et livrées à l'état fini

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IEC 60404-8-7
Edition 3.0 2008-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 8-7: Specifications for individual materials – Cold-rolled grain-oriented
electrical steel strip and sheet delivered in the fully-processed state

Matériaux magnétiques –
Partie 8-7: Spécifications pour matériaux particuliers – Bandes et tôles
magnétiques en acier à grains orientés, laminées à froid et livrées à l'état fini

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 29.030 ISBN 2-8318-9793-9
– 2 – 60404-8-7 © IEC:2008
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
4 Classification.7
5 Designation .7
6 General requirements .8
6.1 Production process.8
6.2 Form of supply .8
6.3 Delivery condition.9
6.4 Surface condition .9
6.5 Suitability for cutting.9
7 Technical requirements .9
7.1 Magnetic properties.9
7.1.1 General .9
7.1.2 Magnetic polarization.9
7.1.3 Specific total loss .11
7.2 Geometric characteristics and tolerances .11
7.2.1 Thickness .11
7.2.2 Width.12
7.2.3 Length .12
7.2.4 Edge camber .13
7.2.5 Flatness (wave factor) .13
7.2.6 Residual curvature .13
7.2.7 Burr height .13
7.3 Technological characteristics .13
7.3.1 Density .13
7.3.2 Stacking factor .13
7.3.3 Number of bends .13
7.3.4 Internal stresses.13
7.3.5 Insulation coating resistance .13
8 Inspection and testing .14
8.1 General .14
8.2 Selection of samples .14
8.3 Preparation of test specimens .14
8.3.1 Magnetic properties .14
8.3.2 Geometrical characteristics and tolerances.15
8.3.3 Technological characteristics.15
8.4 Test methods .16
8.4.1 General .16
8.4.2 Magnetic properties .16
8.4.3 Geometrical characteristics and tolerances.16
8.4.4 Technological characteristics.17
8.5 Retests.17
9 Marking, labelling and packaging.17
10 Complaints .17

60404-8-7 © IEC:2008 – 3 –
11 Information to be supplied by the purchaser .18
Annex A (informative) European steel designation .19

Table 1 – Technological and magnetic properties of the conventional grades of grain-
oriented material.10
Table 2 – Technological and magnetic properties of the high permeability grades of
grain-oriented material.11
Table 3 – Tolerances on nominal width .12
Table A.1 – European steel designation.19

– 4 – 60404-8-7 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
MAGNETIC MATERIALS –
Part 8-7: Specifications for individual materials –
Cold-rolled grain-oriented electrical steel strip and sheet
delivered in the fully-processed state

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