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Non-destructive testing of welds - Magnetic particle testing
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Basic data
| Standard ID | GB/T 26951-2025 (GB/T26951-2025) |
| Description (Translated English) | Non-destructive testing of welds - Magnetic particle testing |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | J33 |
| Classification of International Standard | 25.160.40 |
| Word Count Estimation | 18,157 |
| Date of Issue | 2025-10-31 |
| Date of Implementation | 2026-02-01 |
| Older Standard (superseded by this standard) | GB/T 26951-2011 |
| Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China |
GB/T 26951-2025: Non-destructive testing of welds - Magnetic particle testing
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 25.160.40
CCSJ33
National Standards of the People's Republic of China
Replaces GB/T 26951-2011
Non-destructive testing of welds using magnetic particle testing
(ISO 17638.2016, IDT)
Published on 2025-10-31
Implemented on February 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Safety Warning 1
5.General Requirements 2
Appendix A (Informative) Factors Affecting the Sensitivity of Magnetic Particle Detection 10
Appendix NA (Informative) Cross-yoke Technique 11
Reference 13
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 replaces GB/T 26951-2011 "Non-destructive testing of welds - Magnetic particle inspection". Compared with GB/T 26951-2011, except for structural...
Aside from adjustments and editorial changes, the main technical changes are as follows.
a) The normative reference GB/T 5616 (see section 5.1 of the.2011 edition) has been deleted;
b) The normative reference GB/T 9445 (see section 5.3 of the.2011 edition) has been deleted;
c) The normative reference GB/T 20737 (see Chapter 3 of the.2011 edition) has been deleted;
d) The normative reference GB/T 23907 has been deleted (see Chapters 2, 3, 5.1, and 5.3 of the.2011 edition);
e) The normative reference GB/T 26952 (see Appendix C of the.2011 edition) has been deleted;
f) The "Safety Warning" has been changed (see Chapter 4, Chapter 4 of the.2011 edition);
g) The requirements for the inspected area have been changed (see 5.4,.2011 version 5.4);
h) The operating temperature of the detection medium has been specified (see 5.4);
i) Increased magnetization requirements (see 5.5.1);
j) Strength verification has been added (see 5.5.2);
k) Added requirements for magnetization direction (see 5.6.1);
l) The requirement and verification method for periodic performance verification of the testing media have been removed (see 5.7.2 of the.2011 edition);
m) Added available workpieces for comprehensive performance verification (see 5.10);
n) Appendix C has been deleted (see Appendix C in the.2011 edition).
This document is equivalent to ISO 17638.2016 "Nondestructive testing of welds - Magnetic particle inspection".
The following minimal editorial changes have been made to this document.
---Corrected the normative reference "ISO 9934-1.2015" to "ISO 9934-1.2016". The referenced chapter number and content have not changed.
change;
---Added Appendix NA (Informative).
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 Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Standardization of Welding and Related Processes (SAC/TC55).
This document was drafted by. Shanghai Materials Research Institute Co., Ltd., North China Electric Power Research Institute Co., Ltd., and Shanghai Chengyou Industrial Group.
Group Co., Ltd., Dongfang Electric Group Dongfang Boiler Co., Ltd., Jiangsu Jiangnan Testing Co., Ltd., Shanghai Survey and Design Institute Co., Ltd.
The company, Harbin Welding Research Institute Co., Ltd. of China Academy of Machinery Science and Technology, Taiyuan Heavy Industry Co., Ltd., and Guoneng Boiler and Pressure Vessel Inspection
Limited Liability Company, Jining Luko Testing Technology Co., Ltd., Shanghai University of Applied Technology, Fushun Special Equipment Supervision and Inspection Institute, Shaanxi Xingtong Petroleum
Engineering Technology Co., Ltd., Longjian Science & Industry (Heilongjiang) Co., Ltd.
The main drafters of this document are. Jiang Jiansheng, Ji Changguo, Zhao Cheng, Tan Yunhua, Luo Jianxi, Zhai Liana, Ding Jie, Sun Jian, Zhang Wenjie, and Fan Jinke.
Narisu, Ren Chuanhe, Huang Yin, Xu Leihui, Chen Taijun, Xu Bin, Zhang Pengkun, Wang Xiao, Xu Changqing, Song Dayong, Su Jinhua, Liu Zhengcun, Zhang Ganghua,
Zhu Jian, Zhang Zhiyong, Sun Xiangguang, Xu Guangpeng.
This document was first published in.2011, and this is its first revision.
Non-destructive testing of welds using magnetic particle testing
1 Scope
This document specifies a magnetic particle inspection method for surface defects in welds and heat-affected zones of ferromagnetic materials. This method is applicable to most welders.
Process and connector structure. Appendix A describes the factors in the basic magnetic particle testing process that affect achieving higher or lower detection sensitivity.
This document does not specify the acceptance levels to be displayed. For more information on displayed acceptance levels, please refer to ISO 23278 or the product/application standard.
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.
ISO 3059 Non-destructive testing – Penetrant testing and magnetic particle testing – Observation conditions
Note. GB/T 5097-2020 Nondestructive testing – Observation conditions for penetrant testing and magnetic particle testing (ISO 3059.2012, IDT)
ISO 9934-1.2016 Non-destructive testing—Magnetic particle testing—Part 1.General principles
Note. GB/T 15822.1-2024 Nondestructive testing – Magnetic particle testing – Part 1.General principles (ISO 9934-1.2016, IDT)
ISO 9934-2 Non-destructive testing—Magnetic particle testing—Part 2.Testing media
Note. GB/T 15822.2-2024 Nondestructive testing – Magnetic particle testing – Part 2.Test media (ISO 9934-2.2015, IDT)
ISO 9934-3 Non-destructive testing – Magnetic particle testing – Part 3.Equipment
Note. GB/T 15822.3-2024 Nondestructive testing – Magnetic particle testing – Part 3.Equipment (ISO 9934-3.2015, IDT)
Vocabulary
Note. GB/T 12604.5-2020 Nondestructive Testing Terminology - Magnetic Particle Testing (ISO 12707.2016, IDT)
(for metallic materials)
Note. GB/T 34628-2017 General rules for non-destructive testing of welds in metallic materials (ISO 17635.2016, IDT)
3 Terms and Definitions
The terms and definitions defined in ISO 12707 and ISO 17635 apply to this document.
The standardized terminology databases of the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) can be found at the following URL.
4 Safety Warnings
Special protections should be provided against toxic, flammable and/or volatile materials, electrical safety, and unfiltered ultraviolet radiation.
...
