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Non-destructive testing -- Magnetic memory testing -- General requirements
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Standard ID | GB/T 26641-2021 (GB/T26641-2021) | Description (Translated English) | Non-destructive testing -- Magnetic memory testing -- General requirements | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | J04 | Classification of International Standard | 19.100 | Word Count Estimation | 17,117 | Date of Issue | 2021-12-31 | Date of Implementation | 2022-07-01 | Older Standard (superseded by this standard) | GB/T 26641-2011 | Quoted Standard | ISO 9712; ISO/TS 18173; ISO 24497-2 | Adopted Standard | ISO 24497-1-2020, IDT | Drafting Organization | China Special Equipment Inspection and Research Institute | Administrative Organization | National Nondestructive Testing Standardization Technical Committee | Regulation (derived from) | National Standard Announcement No. 17 of 2021 | Proposing organization | National Nondestructive Testing Standardization Technical Committee (SAC/TC 56) | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | Summary | This standard specifies the terms and definitions of non-destructive testing (NDT) of metal magnetic memory (MMM) technology, as well as the general technical requirements for the application of this method. The non-destructive testing techniques specified in this standard have the following purposes: to determine the inhomogeneity of the magnetomechanical state of ferromagnetic objects, to detect the degree of stress concentration caused by defects and the inhomogeneity of metal microstructure boundaries; to determine the location with surface magnetic field distortion for further Perform microstructural analysis and/or non-destructive testing and evaluation; early damage diagnosis of inspected objects to evaluate their structural life; rapid classification of new and used inspection objects by magnetic heterogeneity for further inspection; magnetic Memory combined with other nondestructive testing methods or techniques (ultrasonic testing, X-ray testing, etc.) can quickly detect the location of the most likely defect, | Standard ID | GB/T 26641-2011 (GB/T26641-2011) | Description (Translated English) | Non-destructive testing. Magnetic memory testing. General principles | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | J04 | Classification of International Standard | 19.100 | Word Count Estimation | 11,128 | Date of Issue | 2011-06-16 | Date of Implementation | 2012-03-01 | Quoted Standard | GB/T 9445; GB/T 12604.6; GB/T 12604.10 | Drafting Organization | China Special Equipment Inspection and Research Institute | Administrative Organization | National Standardization Technical Committee NDT | Regulation (derived from) | Announcement of Newly Approved National Standards No. 9 of 2011 | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | Summary | This standard specifies requirements for ferromagnetic metal materials, components and welds the general principles of magnetic memory testing. Austenitic stainless steel components and welds under certain conditions, magnetic, also refer to the standard magnetic memory testing. This standard is about specific products, equipment, materials, magnetic memory testing standards or the development of written operating instructions provide guidance. Except as specifically provided otherwise, the contents of the standard minimum requirements. |
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)
......
GB/T 26641-2011
Non-destructive testing. Magnetic memory testing. General principles
ICS 19.100
J04
National Standards of People's Republic of China
General NDT magnetic memory
Issued on. 2011-06-16
2012-03-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
The standard non-destructive testing by the National Standardization Technical Committee (SAC/TC56) centralized.
This standard was drafted. China Special Equipment Inspection and Research Institute, Edson (Xiamen) Electronics Co., Ltd., Tsinghua University, Beijing industrial
Science, Beijing Institute of Aeronautical Materials, Beijing University of Aeronautics and Astronautics, North China Electric Power Research Institute, Division of detecting Haitai Technology Co., Ltd. Shanghai
Institute of Materials.
Drafters of this standard. Shen Tian Gong, Hu Bin, Chen Gang, Jimmy Lam, Li Lu Ming, Zhang Yiliang, high Kwong Hing, Xu north, according to mine silver, Huxian Long,
Jinyu Fei.
General NDT magnetic memory
1 Scope
This standard specifies the general principle of ferromagnetic metal materials, components and magnetic memory testing of welds.
Austenitic stainless steel piece and weld under certain conditions, magnetic, can also refer to the standard magnetic memory.
This standard provides guidance on specific products, equipment, materials, magnetic memory testing standards or written operating instructions making. In addition there are special
Special provisions, the contents of this standard are minimum requirements.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 9445 NDT personnel qualification and certification (ISO 9712)
GB/T 12604.6 Terminology for nondestructive testing Eddy current testing
GB/T 12604.10 Terminology for nondestructive testing magnetic memory
3 Terms and Definitions
Terms and definitions GB/T 12604.6 and GB/T 12604.10 defined apply to this document.
4 qualified personnel
According to the present standards for testing personnel should be GB/T 9445 requirements or provisions relating to the competent authorities to obtain the appropriate NDT people
Issued or recognized accreditation body member of the eddy currents or electromagnetic detection level qualifications, in the corresponding qualification level specified testing.
5 Summary of Method
5.1 magnetic memory phenomenon
In a weak magnetic field, the ferromagnetic metal material of environmental factors. the role (such as load, temperature, machining or collision, etc.),
Local area irreversible residual magnetic phenomena, the performance after the removal of the external environmental factors, the local magnetic field of the ferromagnetic material surface becomes
Of the remains.
5.2 Magnetic Memory Testing principle
Under conditions without applying artificial excitation field, the use of sensors measuring the distribution of surface magnetic field detection element, the mutant signal obtained by the magnetic field
To discover the presence of stress may be concentrated on the subject member, the material deterioration or material injury site.
Figure 1 is a schematic diagram of magnetic memory testing. The sensor scanning the subject to obtain the surface magnetic field component (commonly the normal component,
May also be a multi-dimensional components) changes through appropriate data processing and analysis, to discover damage or stress concentration areas that exist on the subject member.
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