1、 IEC 60404-8-8 Edition 2.0 2017-09 INTERNATIONAL STANDARD Magnetic materials Part 8-8: Specifications for individual materials Thin electrical steel strip and sheet for use at medium frequencies IEC 60404-8-8:2017-09(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC, Geneva, Switzerland
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11、als Thin electrical steel strip and sheet for use at medium frequencies INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.030 ISBN 978-2-8322-4805-8 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distribut
12、or. 2 IEC 60404-8-8:2017 IEC 2017 CONTENTS FOREWORD . 4 1 Scope 6 2 Normative references 6 3 Terms and definitions 7 4 Classification . 7 5 Designation . 7 6 General requirements 7 6.1 Production process . 7 6.2 Form of supply 7 6.3 Delivery condition . 8 6.4 Surface condition 8 6.5 Suitability for
13、cutting . 8 7 Technical requirements . 9 7.1 Magnetic properties 9 7.1.1 Magnetic polarization . 9 7.1.2 Specific total loss 10 7.2 Geometric characteristics and tolerances 10 7.2.1 Thickness 10 7.2.2 Width . 12 7.2.3 Edge camber . 12 7.2.4 Residual curvature . 12 7.2.5 Burr height . 13 7.3 Technolo
14、gical characteristics 13 7.3.1 Density 13 7.3.2 Stacking factor. 13 7.3.3 Number of bends . 13 7.3.4 Insulation coating resistance . 13 8 Inspection and testing 13 8.1 General . 13 8.2 Selection of samples . 14 8.3 Preparation of test specimens . 14 8.3.1 Magnetic properties . 14 8.3.2 Geometrical c
15、haracteristics and tolerances 15 8.3.3 Technological characteristics . 15 8.4 Test methods 15 8.4.1 General . 15 8.4.2 Magnetic properties . 15 8.4.3 Geometrical characteristics and tolerances 16 8.4.4 Technological characteristics . 16 8.5 Retests . 17 9 Marking, labelling and packaging . 17 10 Com
16、plaints 17 11 Information to be supplied by the purchaser 17 Annex A (informative) Optional stacking factor for non-oriented coated products . 18 Annex B (informative) Optional magnetic specifications . 19 IEC 60404-8-8:2017 IEC 2017 3 Annex C (informative) Calculation of density values . 20 Bibliog
17、raphy 21 Table 1 Magnetic and technological characteristics of non-oriented electrical steel strip and sheet 9 Table 2 Magnetic and technological characteristics of grain-oriented electrical steel strip and sheet 10 Table 3 Thickness tolerances . 11 Table 4 Width tolerance of non-oriented strip and
18、sheet . 12 Table 5 Width tolerance of grain oriented electrical steel products . 12 Table A.1 Optional stacking factor for non-oriented coated products . 18 Table B.1 Optional magnetic specifications for non-oriented electrical steel strip and sheet 19 4 IEC 60404-8-8:2017 IEC 2017 INTERNATIONAL ELE
19、CTROTECHNICAL COMMISSION _ MAGNETIC MATERIALS Part 8-8: Specifications for individual materials Thin electrical steel strip and sheet for use at medium frequencies FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national
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29、cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identi
30、fying any or all such patent rights. International Standard IEC 60404-8-8 has been prepared by IEC technical committee 68: Magnetic alloys and steels. This second edition cancels and replaces the first edition published in 1991. This edition constitutes a technical revision. This edition includes th
31、e following significant technical changes with respect to the previous edition: extension of the range of electrical steels to include the improved grades. IEC 60404-8-8:2017 IEC 2017 5 The text of this International Standard is based on the following documents: CDV Report on voting 68/546/CDV 68/56
32、2/RVC Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts in the IEC 60404 series, under the general
33、 title Magnetic materials, can be found on the IEC website. The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document
34、will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 6 IEC 60404-8-8:2017 IEC 2017 MAGNETIC MATERIALS Part 8-8: Specifications for individual materials Thin electrical steel strip and sheet for use at medium
35、 frequencies 1 Scope This part of IEC 60404 defines the grades of thin non-oriented electrical steel strip and sheet in nominal thicknesses of 0,05 mm, 0,10 mm, 0,15 mm, 0,20 mm, 0,25 mm, 0,30 mm and 0,35 mm and of thin grain-oriented electrical steel strip and sheet in nominal thicknesses of 0,05 m
36、m, 0,10 mm, 0,15 mm and 0,18 mm. In particular, it gives general requirements, magnetic properties, geometric characteristics and tolerances, technological characteristics, as well as inspection procedures. NOTE For thin non-oriented electrical steel strip and sheet, other nominal thicknesses (i.e.
37、0,12 mm, 0,18 mm, 0,23 mm and 0,27 mm) can be agreed between the manufacturer and the purchaser. This document applies to electrical steel strip and sheet supplied in the finally annealed condition in coils or sheets and intended for the construction of magnetic circuits predominantly used at freque
38、ncies in the range from 100 Hz to 10 kHz. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edi
39、tion of the referenced document (including any amendments) applies. IEC 60050-121, International Electrotechnical Vocabulary Part 121: Electromagnetism (available at http:/www.electropedia.org/) IEC 60050-221, International Electrotechnical Vocabulary Chapter 221: Magnetic materials and components (
40、available at http:/www.electropedia.org/) IEC 60404-2, Magnetic materials Part 2: Methods of measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame IEC 60404-9, Magnetic materials Part 9: Methods of determination of the geometrical characteristics of
41、magnetic steel sheet and strip IEC 60404-10, Magnetic materials Part 10: Methods of measurement of magnetic properties of magnetic steel sheet and strip at medium frequencies IEC 60404-13, Magnetic materials Part 13: Methods of measurement of resistivity, density and stacking factor of electrical st
42、eel strip and sheet ISO 404, Steel and steel products General technical delivery requirements ISO 7799, Metallic materials Sheet and strip 3 mm thick or less Reverse bend test ISO 10474, Steel and steel products Inspection documents IEC 60404-8-8:2017 IEC 2017 7 3 Terms and definitions For the purpo
43、ses of this document, the terms and definitions given in IEC 60050-121 and IEC 60050-221 and the following apply. 3.1 number of bends number of alternate bends possible before the appearance of the first crack in the base metal visible to the naked eye Note 1 to entry The number of bends constitutes
44、 an indication of the ductility of the product. 3.2 edge camber greatest distance between a longitudinal edge of a length of strip or a sheet and the line joining the two extremities of the measured length of this edge Note 1 to entry: See IEC 60404-9. 4 Classification The grades covered by this doc
45、ument are classified according to the maximum value of the specific total loss in watts per kilogram and according to the nominal thickness of the product 1(0,05 mm, 0,10 mm, 0,15 mm, 0,20 mm, 0,25 mm, 0,30 mm and 0,35 mm for non-oriented electrical steel; 0,05 mm, 0,10 mm, 0,15 mm and 0,18 mm for g
46、rain-oriented electrical steel). 5 Designation The steel name comprises the following in the order given: a) the characteristic letters: NO for non-oriented electrical steel; GO for grain-oriented electrical steel; b) one hundred times the nominal thickness of the product, in millimetres; c) the spe
47、cified value of the maximum specific total loss at 1,0 T and the given frequency for non-oriented electrical steel grades. EXAMPLE: NO 20-13: non-oriented strip or sheet in nominal thickness of 0,20 mm with a maximum specific total loss of 13 W/kg at 1,0 T and 400 Hz. 6 General requirements 6.1 Prod
48、uction process The production process of the steel and its chemical composition are left to the discretion of the manufacturer. 6.2 Form of supply The product is supplied in coils in the case of strip and in bundles in the case of sheets. The mass of the coils or the bundles of sheets shall be agree
49、d between the manufacturer and the purchaser at the time of enquiry and order. _ 1In the rest of the document, the word “product” is used to mean “strip and sheet”. 8 IEC 60404-8-8:2017 IEC 2017 The recommended value for the internal diameter of coils is 508 mm; however, another value (e.g. 400 mm) may be agreed for the internal diameter of coils between the manufacturer and the purchaser. The strip shall be of constant width and wound in such a manner
