GB/T 26641-2021 PDF in English
GB/T 26641-2021 (GB/T26641-2021, GBT 26641-2021, GBT26641-2021)
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Non-destructive testing -- Magnetic memory testing -- General requirements
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Non-destructive testing -- Magnetic memory testing -- General principles
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GB/T 26641-2021: PDF in English (GBT 26641-2021) GB/T 26641-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.100
CCS J 04
GB/T 26641-2021 / ISO 24497-1:2020
Replacing GB/T 26641-2011
Non-destructive testing - Magnetic memory testing -
General requirements
(ISO 24497-1:2020, Non-destructive testing - Magnetic memory testing - Part 1:
Vocabulary and general requirements, IDT)
ISSUED ON: DECEMBER 31, 2021
IMPLEMENTED ON: JULY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 General requirements ... 9
5 Inspected object ... 10
6 Test equipment ... 11
7 Preparation for testing ... 12
8 Test ... 13
9 Test report ... 15
10 Safety requirements and personnel qualification ... 16
Annex A (Informative) Example of stray field distribution of an indication ... 18
Bibliography ... 20
Foreword
This document is drafted in accordance with GB/T 1.1-2020 "Directives for
standardization - Part 1: Rules for the structure and drafting of standardizing
documents".
This document replaces GB/T 26641-2011 "Non-destructive testing - Magnetic
memory testing - General principles". Compared with GB/T 26641-2011, in addition to
structural adjustment and editorial changes, the main technical changes are as follows:
a) Modify the scope (see Clause 1; Clause 1 of the 2011 edition);
b) Modify and add normative references (see Clause 2; Clause 2 of the 2011 edition);
c) Modify and add terms (see Clause 3; Clause 3 of the 2011 edition);
d) Modify the method summary (see Clause 4; Clause 5 of the 2011 edition);
e) Modify the description of inspected object (see Clause 5; Clause 7 of the 2011
edition);
f) Modify the requirements for test equipment (see Clause 6; Clause 8 of the 2011
edition);
g) Modify the description of preparation for testing (see Clause 7; Clause 7 of the
2011 edition);
h) Modify the evaluation parameters and procedures; expand the previous normal
component or tangential component into a three-dimensional component (see 8.1;
Clause 10 of the 2011 edition);
i) Add the acquisition method and value criterion for gradient intermediate value and
gradient coefficient threshold (see 8.2 and 8.3);
j) Modify the test record and report (see Clause 9; Clause 11 of the 2011 edition);
k) Modify personnel qualification requirements (see Clause 10; Clause 4 of the 2011
edition).
This document is identical to ISO 24497-1:2020 "Non-destructive testing - Magnetic
memory testing - Part 1: Vocabulary and general requirements".
The following minimal editorial change has been made to this document:
- In order to harmonize with the existing standards, change the standard name to
"Non-destructive testing - Magnetic memory testing - General requirements".
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority of this document shall not be held
responsible for identifying any or all such patent rights.
This document was proposed by and shall be under the jurisdiction of National
Technical Committee 56 on Non-destructive Testing of Standardization Administration
of China (SAC/TC 56).
Drafting organizations of this document: China Special Equipment Inspection and
Research Institute, Eddysun (Xiamen) Electronics Co., Ltd., Anhui Huaxia High
Science and Tech Development Co., Ltd., Tsinghua University, China Aerodynamics
Research and Development Center, Jiaxing Special Equipment Inspection and Testing
Institute, Chengdu University of Information Technology, Beijing University of
Technology, Central Research Institute of Building and Construction Co., Ltd.,
Shandong Kejie Engineering Testing Co., Ltd., Luoyang LYC Bearing Co., Ltd.
Main drafters of this document: Hu Bin, Wang Baoxuan, Shen Yongna, Shen Gongtian,
Lin Junming, Li Luming, Li Huan, Wei Dong, Pan Jinping, Hu Yun, Zhang Yiliang,
Gao Guangxing, Zhang Junjiao, Zhang Di, Liang Yumei, Chen Cuili.
The previous editions of this document and the documents it replaces are as follows:
- It was first issued as GB/T 26641-2011 in 2011. This is the first revision.
Non-destructive testing - Magnetic memory testing -
General requirements
1 Scope
This document specifies terms and definitions for non-destructive testing (NDT) by the
technique of metal magnetic memory (MMM) as well as general requirements for
application of this technique of the method.
This NDT technique specified in this document has the following objectives:
- determination of the heterogeneity of the magneto-mechanical state of
ferromagnetic objects, detection of defect stress concentration and boundaries of
metal microstructure heterogeneity;
- determination of locations with magnetic stray field aberrations for further
microstructural analysis and/or non-destructive testing and evaluation;
- early diagnostics of fatigue damage of the inspected object and evaluation of its
structural life time;
- quick sorting of new and used inspection objects by their magnetic heterogeneity
for further testing;
- efficiency improvement of non-destructive testing by combining magnetic memory
with other NDT methods or techniques (ultrasonic testing, x-ray, etc.) by fast
detection of the most probable defect locations;
- quality control of welded joints of various types and their embodiment (including
contact and spot welding). See ISO 24497-2 for details of this application.
2 Normative references
The contents of the following documents, through normative references in this text,
constitute indispensable provisions of this document. Among them, for dated references,
only the edition corresponding to that date applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
ISO 9712 Non-destructive testing - Qualification and certification of personnel
Note: GB/T 9445-2015 Non-destructive testing - Qualification and certification of NDT
personnel (ISO 9712:2012, IDT)
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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