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GB/T 46476-2025Methods of determination of the geometrical characteristics of electrical steel strip and sheet (English PDF)

电工钢带和钢片几何特性的测量方法

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Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

October 31, 2025

Implementation date

May 1, 2026

Scope

GB/T 46476-2025 is the English-translated version of 电工钢带和钢片几何特性的测量方法.

GB/T 46476-2025 is a Chinese national standard describing how to measure the geometrical characteristics of electrical steel strip and sheet. It adopts IEC 60404-9:2018.

The document sets out methods for measuring edge waves, residual curvature, sickle curve (camber), shear edge deviation caused by internal stress, and burr height.

It also covers the test report, and an informative appendix gives an example of a clamping system. It applies to electrical steel strip and sheet of categories B2, C21, C22 and C23 of IEC 60404-1 that form magnetic circuits, and to low-carbon mild steel flat material and similar products. Issued on 31 October 2025 and applicable from 1 May 2026.

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Document preview — GB/T 46476-2025

National Standard of the People's Republic of China

ICS: 29.030
Classification: K 14

Issued by: State Administration for Market Regulation

Preface
1 Scope
2 Normative References
3 Terms and Definitions
4 Measurement Method
4.1 Edge Waves (Wave Degree)
4.2 Residual Curvature
4.3 Sickle Curve
4.4 Shear edge deviation caused by internal stress
4.5 Burr height
5 Test Report
Appendix A (Informative) Example of a clamping system
Reference

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

This document adopts IEC 60404-9:2018 "Magnetic materials - Part 9: Methods of measurement of geometric properties of electrical steel strips and sheets".

The following minimal editorial changes have been made to this document.

---To align with existing standards, the standard name has been changed to "Methods for measuring the geometric properties of electrical steel strips and sheets".

1 Scope

This document describes the edge waviness (wavelength), residual curvature, camber, and shear edge deviation caused by internal stress in electrical steel strips and sheets. Methods for measuring and testing burr height.

This document applies to electrical steel strips (sheets) and low-carbon mild steel that conform to categories B2, C21, C22 and C23 of IEC 60404-1 and constitute magnetic circuits. Measurement of the geometric properties of flat materials, etc.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. (IEV)-Part 121: Electromagnetism)

Note: GB/T 2900.60-2002 Electrical Engineering Terminology. Electromagnetism (eqvIEC 60050-121.1998)

Note: GB/T 9637-2001 Electrical Engineering Terminology. Magnetic Materials and Components (eqv IEC 60050-221:1990)

IEC 60404-1 Magnetic materials - Part 1: Classification

Note: GB/T 21219-2023 Classification of Magnetic Materials (IEC 60404-1:2016, MOD)

3 Terms and Definitions

The terms and definitions defined in IEC 60050-121 and IEC 60050-221, as well as the following terms and definitions, apply to this document.

The addresses of the terminology databases maintained by ISO and IEC for standardization are as follows. […]

3.1 Edge wave

Waveform A steel strip or sheet of a certain length has a wavy, flatness variation at its sheared edge.

3.2 Residual curvature

The change in flatness of a steel strip or sheet of a certain length exhibiting permanent bending along the rolling direction.

3.3 Edgecamber

The maximum distance between the longitudinal edge of a steel strip or sheet of a certain length and the line connecting the two ends of the measuring section.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 12 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60404-1

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