BS EN IEC 60404-13:2018 – TC:2020 Edition
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Tracked Changes. Magnetic materials – Methods of measurement of resistivity, density and stacking factor of electrical steel strip and sheet
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 67 |
IEC 60404-13:2018 specifies the methods used for determining the resistivity, density and stacking factor of grain-oriented and non-oriented electrical steel strip and sheet. These quantities are necessary to establish the physical characteristics of the material. Moreover, the density is necessary to allow specified values of the magnetic polarization, resistivity and stacking factor to be determined. Since these properties are functions of temperature, the measurements will be made at an ambient temperature of (23 ±5) °C except when specified in this document. This edition includes the following significant technical changes with respect to the previous edition:
- the sequence of the density and resistivity sections is changed and the title of the document revised to reflect this;
- the van-der-Pauw method (Method R2) is also applicable to Epstein strip specimens;
- the gas pyknometer method is introduced, and the liquid immersion method and the calculation method based on the chemical composition are quoted;
- the requirements of the stacking factor section, such as the tolerance of the dimensions of the test specimen and the repeatability of measurement, are changed;
- an example of the apparatus for determination of the resistivity using a rectangular sheet, which was previously part of the main body of the text, is moved to constitute informative Annex A;
- an example of the determination of the density by using the gas pyknometer method is added as an informative Annex B;
- an example of the determination of density based on the calculation of silicon and aluminium contents is added as an informative Annex C.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 39 | undefined |
| 42 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 44 | English CONTENTS |
| 46 | FOREWORD |
| 48 | 1 Scope 2 Normative references 3 Terms and definitions |
| 49 | 4 Determination of the resistivity 4.1 General 4.2 Principles of measurement 4.2.1 Method of determining ρ for an Epstein strip specimen (Method R1) Figures Figure 1 – Circuit for the measurement of resistance ofan Epstein strip specimen (Method R1) |
| 50 | 4.2.2 Method of determining ρ for a rectangular sheet specimen (Method R2) with supplementary remarks for strip specimen Figure 2 – Circuit for the measurement of resistance ofa rectangular sheet specimen (Method R2) |
| 51 | 4.2.3 Determination of thickness d |
| 52 | 4.3 Test specimen 4.3.1 Epstein strip specimen 4.3.2 Rectangular sheet specimen 4.4 Apparatus 4.4.1 Common requirements for Method R1 and Method R2 4.4.2 Requirements for Method R1 |
| 53 | 4.4.3 Requirements for Method R2 4.5 Measuring procedure 4.5.1 Determination of the thickness d of the test specimen 4.5.2 Procedure with strip specimen (Method R1) 4.5.3 Procedure with rectangular sheet specimen (Method R2) 4.6 Reproducibility |
| 54 | 4.7 Test report 5 Determination of the density 5.1 General |
| 55 | 5.2 Method based on the measurement of resistance (Method D1) 5.2.1 Principles of measurement Figure 3 – Experimental data and the regression line of the density ρm againstthe product ρm·ρ for non-oriented electrical steel sheet [6] |
| 56 | 5.2.2 Test specimen 5.2.3 Measuring procedure |
| 57 | 5.2.4 Reproducibility 5.3 Gas pyknometer method (Method D2) 5.3.1 Principles of measurement 5.3.2 Test specimen 5.3.3 Test apparatus 5.3.4 Measuring procedure 5.3.5 Reproducibility 5.4 Test report |
| 58 | 6 Determination of the stacking factor 6.1 General 6.2 Test specimen 6.3 Measuring procedure |
| 59 | 6.4 Reproducibility 6.5 Test report Figure 4 – Schematic diagram of stacking specimen and rams |
| 61 | Annex A (informative)An example of the apparatus for the measurement of the resistivityusing a rectangular sheet specimen (Method R2) Figure A.1 – Schematic cross-sectional view of the arrangementof the contact holder |
| 62 | Annex B (informative)An example of the determination of density usingthe gas pyknometer method (Method D2) B.1 Overview B.2 Test specimen Table B.1 – Number of test discs of diameter 36 mm |
| 63 | B.3 Apparatus B.4 Calibration B.5 Measuring procedure Figure B.1 – Diagram illustrating the two-chamber pressure gas pyknometer |
| 64 | B.6 Repeatability |
| 65 | Annex C (informative)Calculation of density based onsilicon and aluminium content (Method D4) |
| 66 | Bibliography |
