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GB/T 20831-2025: Method of test for the thermal endurance of surface insulation coatings of electrical sheet and strip
Status: Valid
GB/T 20831: Evolution and historical versions
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| GB/T 20831-2025 | English | 279 |
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Method of test for the thermal endurance of surface insulation coatings of electrical sheet and strip
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| GB/T 20831-2007 | English | 319 |
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Methods of assessment of temperature capability of inter laminar insulation coatings of electrical sheet and strip
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Basic data | Standard ID | GB/T 20831-2025 (GB/T20831-2025) | | Description (Translated English) | Method of test for the thermal endurance of surface insulation coatings of electrical sheet and strip | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H21 | | Classification of International Standard | 77.040.99 | | Word Count Estimation | 14,155 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 20831-2007 | | Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China | GB/T 20831-2025: Method of test for the thermal endurance of surface insulation coatings of electrical sheet and strip
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ICS 77.040.99
CCSH21
National Standards of the People's Republic of China
Replaces GB/T 20831-2007
Test method for thermal durability of insulating coating of electrical steel strip (sheet)
(IEC 60404-12.2023,Magneticmaterials-Part 12.Methodsoftestforthe
steel strip and sheet (MOD)
Published on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
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".
Drafting.
This document supersedes GB/T 20831-2007 "Test Method for Temperature Characteristics of Interlayer Insulation Coatings of Electrical Steel Sheets (Strips)", and is consistent with GB/T 20831-
Compared to.2007, aside from structural adjustments and editorial changes, the main technical changes are as follows.
a) The applicable temperature range has been changed (see Chapter 1, Chapter 1 of the.2007 edition);
b) General requirements for thermal durability have been added (see 4.1);
c) Added sample clamping and stacking methods, and sample pressurization methods for rated temperatures below and above 500°C (see 4.2);
d) Increased heat treatment requirements for different heating times (see 4.3);
e) The requirements for the adoption of standards, specimens, and corresponding testing equipment for the adhesion test method have been changed (see 6.2, 4.2.1 of the.2007 edition);
f) The evaluation requirements for adhesion testing have been changed (see 6.3, 4.2.2 of the.2007 edition);
g) The test method and evaluation requirements for surface insulation resistance have been changed (see 7.3, 4.3.2 of the.2007 edition);
h) The test method and evaluation requirements for the stacking factor have been changed (see 8.2, 8.3, and 4.4.2 of the.2007 edition);
i) Appendices A and B from the.2007 edition have been deleted;
j) Appendices C and D of the.2007 edition have been revised and their structure adjusted (see Appendices A and B, and Appendix C of the.2007 edition).
Appendix D);
k) A comparison table of temperature/time performance indicators for different types of coatings has been added (Appendix C).
This document is modified to adopt IEC 60404-12.2023 "Magnetic materials - Part 12.Evaluation of heat resistance of insulating coatings on electrical steel strips (sheets)".
"A defined test method".
This document has undergone several structural adjustments compared to IEC 60404-12.2023.Appendix A lists the differences between this document and IEC 60404-12.
A list of chapter and article numbers for 2023.
This document contains technical differences compared to IEC 60404-12.2023, and the relevant clauses are given in Appendix B.
A list of technical differences and their causes.
The following editorial changes have been made to this document.
---The standard name has been changed to "Test Method for Thermal Durability of Electrical Steel Strip (Sheet) Insulation Coating".
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This document was drafted by. Wuhan Iron and Steel Co., Ltd., Shougang Zhixin Electromagnetic Materials (Qian'an) Co., Ltd., and Metallurgical Industry Information Standards.
Research Institute, Ansteel Group Beijing Research Institute Co., Ltd., Dongfang Electric Group Dongfang Electric Machinery Co., Ltd., China Electric Power Research Institute Co., Ltd.
company.
The main drafters of this document are. Xiang Qian, Huang Shuang, Hu Zhiyuan, Wang Yujie, Liu Xuming, Xie Zhihui, Cheng Ling, Zhang Junpeng, Niu Feng, and Xu Haochi.
Gu Linhao, Cheng Sheng, Ma Guang, Shen Jie, Liu Baoshi, Peng Pei.
The release history of this document and the document it replaces is as follows.
---First published in.2007 as GB/T 20831-2007;
---This is the first revision.
introduction
The surface insulation coating of electrical steel strips (sheets) is sometimes exposed to high temperatures during use or processing. Therefore, the surface insulation coating is subject to heat.
Durability is important.
Because measuring the performance of surface insulating coatings at high temperatures is both expensive and time-consuming, the thermal durability of surface insulating coatings is typically...
The evaluation is conducted by assessing the changes in the properties of a specified coating measured at ambient temperature, i.e., heat-treating at a specified temperature for a specific time, followed by cooling.
However, the test was conducted after the ambient temperature was reached.
Test method for thermal durability of insulating coating of electrical steel strip (sheet)
1.Scope
This document describes a test method for the thermal durability of insulating coatings on electrical steel strips (sheets).
This document defines the heat treatment process for electrical steel after heat treatment at a specified temperature (maximum 850°C) and for a specified duration (maximum 2500 h).
General principles and technical details for evaluating the thermal durability of insulating coatings (sheets), including principles, specimens, test procedures, measurement results, and...
Test report.
The specified properties were measured at an ambient temperature of (23±5)℃ before and after heat treatment. This document applies to the following properties of insulating coatings.
---Adhesion;
---Surface insulation resistance/Interlayer insulation resistance;
---Stacking coefficient.
This document does not apply to other properties of insulating coatings, such as weldability, or discoloration that may occur when exposed to high temperatures.
Because this is a long-term test, this document is not applicable to acceptance testing of materials for specific orders.
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.
GB/T 2522 Test methods for insulation resistance and adhesion of coatings on electrical steel strips (sheets)
GB/T 2900.60 Electrical Engineering Terminology. Electromagnetism
GB/T 9637 Electrical Engineering Terminology. Magnetic Materials and Components
GB/T 19289 Methods for measuring resistivity, density and stacking factor of electrical steel strips (sheets)
3.Terms and Definitions
The terms and definitions defined in GB/T 2900.60 and GB/T 9637, as well as the following terms and definitions, apply to this document.
3.1
T/t
It consists of temperature T (°C) and time t (h), where t is the duration of heat treatment that the insulating coating can withstand relative to the specific coating properties.
Note 1.This mark is used to rate the thermal durability of insulating coatings.
Note 2.A coating may have more than one performance characteristic specification. For example, given characteristic specifications.200/2500 and 800/2, these indicate that the coating performs well at.200℃.
It can withstand 2500 hours of heat treatment, and can withstand 2 hours of heat treatment at 800℃.
4 General Requirements
4.1 General Rules
The thermal durability of the insulating coating should be evaluated by assessing the changes in coating properties before and after heat treatment at a specified temperature T and a specified time t.
The coating properties should be measured at an ambient temperature of (23±5)℃. The thermal durability of the following coating properties should be evaluated separately.
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