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GB/T 26952-2025: Non-destructive testing of welds - Magnetic particle testing - Acceptance levels
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GB/T 26952-2025: Non-destructive testing of welds - Magnetic particle testing - Acceptance levels

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ICS 25.160.40 CCSJ33 National Standards of the People's Republic of China Replaces GB/T 26952-2011 Non-destructive testing and magnetic particle testing of welds. acceptance level (ISO 23278.2015, 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.Detection Parameters 1 5.Acceptance Level 2 Appendix A (Informative) Recommended Detection Parameters 3 Reference 4

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 26952-2011 "Non-destructive Testing of Welds - Acceptance Grades of Magnetic Particle Testing for Welds", and is consistent with GB/T 26952- Compared to.2011, aside from structural adjustments and editorial changes, the main technical changes are as follows. a) Add the association between this document and other documents, and clarify that this document does not include the acceptance level displayed in the group (see Chapter 1); b) The normative reference GB/T 26951 (see Chapter 1 of the.2011 edition) has been deleted; c) The normative reference GB/T 12604.5 (see Chapter 3 of the.2011 edition) has been deleted; d) The requirement to assess adjacent defects separately has been added (see 5.1); e) Group display has been removed (see 5.2 in the.2011 version). This document adopts ISO 23278.2015 "Nondestructive testing of welds - Magnetic particle testing - Acceptance grades". 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., Dongfang Electric Group Dongfang Boiler Co., Ltd., and North China Electric Power Research Institute. Research Institute Co., Ltd., Jiangsu Jiangnan Testing Co., Ltd., Shanghai Chengyou Industrial Group Co., Ltd., and Guoneng Boiler and Pressure Vessel Inspection Co., Ltd. Limited Company, Shanghai Survey and Design Institute Co., Ltd., Harbin Welding Research Institute Co., Ltd. of China Machinery Engineering Corporation, Taiyuan Heavy Industry Co., Ltd. Limited Liability Company, China Special Equipment Inspection and Research Institute, Fushun Special Equipment Supervision and Inspection Institute, Guanghan Huayou Drilling Equipment Manufacturing Co., Ltd. The main drafters of this document are. Ding Jie, Tan Yunhua, Ji Changguo, Jiang Jiansheng, Zhao Cheng, Zhang Ning, Narisu, Luo Jianxi, Zhai Liana, Wu Chao, and Tian Yi. Che Youming, Huang Yin, Sun Yun, Wang Weihua, Zhang Pengkun, Chen Xiaoming, Wang Xiao, Jiang Haitao, Su Jinhua, Zhang Min, Li Xi, Zhu Jian, Guo You, Wang Chengyuan. This document was first published in.2011, and this is its first revision. Non-destructive testing and magnetic particle testing of welds. acceptance level

1 Scope

This document specifies the acceptance level requirements for defects in ferromagnetic steel welds as indicated by magnetic particle testing. The acceptance levels specified in this document are primarily applicable to testing during the manufacturing stage. Note. The acceptance levels specified in this document can also be used for in-service testing. The acceptance levels specified in this document are based on the expected results when using techniques conforming to ISO 17638 and parameters recommended in Appendix A. The testing capabilities. Acceptance grades are related to welding documents, application documents, technical conditions, or regulations. Acceptance grades are interrelated with ISO 5817. The relationship between them is shown in ISO 17635. This document does not specify the acceptance level for group display.

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. tions) Note. GB/T 20737-2006 General terms and definitions for nondestructive testing (ISO /T S18173.2005, IDT)

3 Terms and Definitions

The terms and definitions defined in ISO /T S18173 apply to this document. 3.1 Linear indication Displays that are longer than three times their width. 3.2 Non-linear indication Displays with a length less than or equal to 3 times the width. 4.Detection parameters Many parameters, whether individual or in combination, affect the ability of this technology to detect defects of a given size and orientation based on the condition of the inspected surface. The ability. The detection of small defects depends largely on the surface condition of the weld and the testing medium used. Appendix A provides a high level of accuracy. Application examples of detection capability parameters. ...