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NB/T 47013.4-2015

Chinese Standard: 'NB/T 47013.4-2015'
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Standard ID NB/T 47013.4-2015 (NB/T47013.4-2015)
Description (Translated English) (Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing)
Sector / Industry Energy Industry Standard (Recommended)
Date of Issue 2015-04-02
Date of Implementation 2015-09-01
Older Standard (superseded by this standard) JB/T 4730.4-2005
Regulation (derived from) ?Energy Bureau Announcement 2015 No. 3

NB/T 47013.4-2015
ICS 77.040.20
H 26
Replacing JB/T 4730.4-2005
Nondestructive testing of pressure equipment –
Part 4. Magnetic particle testing
第 4 部分. 磁粉检测
Issued by. National Energy Administration
Table of contents
Foreword ... 3 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 General requirements ... 8 
5 Testing method ... 24 
6 Magnetic marks indication classification, observation and recording ... 26 
7 Retesting ... 28 
8 Demagnetization ... 28 
9 Quality grading ... 29 
10 Magnetic particle testing of in-service pressure equipment ... 30 
11 Testing records and reports ... 30 
Appendix A (Informative) Waveforms of various magnetization currents,
ammeter indication and conversion ... 32 
Appendix B (Informative) A typical magnetization method for various types of
welded joints ... 34 
The standard NB/T 47013 “Nondestructive testing of pressure equipment” is
divided into the following 13 parts.
- Part 1. General requirements;
- Part 2. Radiographic testing;
- Part 3. Ultrasonic testing;
- Part 4. Magnetic particle testing;
- Part 5. Penetrant testing;
- Part 6. Eddy current testing;
- Part 7. Visual examination;
- Part 8. Leak testing;
- Part 9. Acoustic emission testing;
- Part 10. Ultrasonic time of flight diffraction technique;
- Part 11. Standard practice for X-ray digital radiography;
- Part 12. Magnetic flux leakage testing;
- Part 13. Pulsed eddy current testing.
This part is part 4 of NB/T 47013. Magnetic particle testing.
This part was drafted in accordance with the rules given in GB/T 1.1-2009
“Directives for standardization - Part 1. Structure and drafting of standards”.
This part replaces JB/T 4730.4-2005 “Nondestructive testing of pressure
equipment - Part 4. Magnetic particle testing”. As compared with JB/T
4730.4-2005, the main technical changes of this part are as follows.
- MOVE the terms and definitions on magnetic particle testing in the original
JB/T 4730.1-2005 into this part;
- ADD the testing process specifications; SPECIFY the relevant factors on
the process specifications;
- ADD the relevant contents on the use of standard test piece and
cross-yoke testing method;
- ADD the relevant provisions on standard test piece verification after
determining the magnetization current through empirical formula;
- In accordance with GB/T 12604.5-2008, CHANGE the bias mandrel
method into eccentric conductor method;
- ADJUST the effective width and overlap range of the magnetic yoke
method testing;
- ADJUST the relevant contents on the non-conductive coating magnetic
particle testing; WIDEN the testing restrictions;
- ADJUST the effective magnetization region of the coil method
- In accordance with the safety technical specifications and product
standards of the pressure equipment in China AND combining such
foreign standards as ASME and ISO, etc., ADJUST the quality grading
requirements of the welding joints, machined parts under pressure, and
- ADJUST the relevant provisions on record indication; ADD the record
indication method;
- ADD the contents on magnetic particle testing safety;
- ADJUST the relevant contents on the magnetic particle testing of the
pressure equipment in service; IMPROVE the sensitivity requirements for
the magnetic particle testing of the inner wall of the pressure equipment in
This part was proposed by AND shall be under the jurisdiction of the National
Boiler and Pressure Vessel Standardization Technical Committee (SAC/TC
The drafting organizations of this part. Hefei General Machinery Research
Institute, China Special Equipment Testing Research Institute, Zhejiang
Special Equipment Inspection Research Institute, China Guangdong Nuclear
Engineering Co., Ltd., Shanghai Boiler Factory Co., Ltd.
The main drafters of this part. Chen Wenhu, Zhou Yufeng, Guo Weican, Zhu
Congbin, Wang Xiaomei, Cheng Huayun, Zhang Peiming.
Nondestructive testing of pressure equipment –
Part 4. Magnetic particle testing
1 Scope
1.1 This part of NB/T 47013 specifies the magnetic particle testing methods
and quality grading requirements for the pressure equipment weld and its raw
materials as well as the machined parts.
1.2 This part applies to the testing of the surface or near surface defects of the
ferromagnetic material sheet, composite sheet, pipe, fittings and forgings, as
well as the surface or near surface defects of the ferromagnetic material butt
joint, T-type welded joint and corner joint. It is not applicable to the testing of
the non-ferromagnetic materials.
1.3 The relevant bearing parts and structural parts of pressure equipment may
also be subjected to magnetic particle testing with reference to this part.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this document.
GB/T 5097 Non-destructive testing - Penetrant testing and magnetic particle
testing - Viewing conditions
GB 11533 Standard for logarithmic visual acuity charts
GB/T 12604.5 Non-destructive testing - Terminology - Terms used in
magnetic particle testing
GB/T 23906 Non-destructive testing - Rings for magnetic particle testing
GB/T 23907 Non-destructive testing - Shims for magnetic particle testing
JB/T 6063 Non-destructive testing - Materials for magnetic particle testing
JB/T 8290 Non-destructive testing equipment - Magnetic particle flaw
NB/T 47013.1 Non-destructive testing of pressure equipment - Part 1.
General requirements
3 Terms and definitions
The terms and definitions as defined in GB/T 12604.5 and NB/T 47013.1 as
well as the following terms and definitions apply to this part.
Relevant indication
It refers to the magnetic mark indication as formed due to the magnetic
particle absorption by the leakage magnetic field which is due to the
presence of flaw in the process of magnetic particle testing.
Non-related indication is non-relevant
It refers to the magnetic mark indication as formed by the magnetic particle
absorption by the leakage magnetic field due to the change of the cross
section or material permeability in the process of magnetic particle testing.
False indication
It refers to the magnetic mark indication which is not formed due to the
magnetic particle absorption by the leakage magnetic field.
Combinatorial magnetization
It refers to the magnetization method to produce a magnetic field the size
and direction of which is in circular, oval or spiral changes with time in the
Longitudinal/transverse flaw
When the included angle between the long axis direction of the flaw
magnetic mark and the workpiece (shaft or tube) axis or the busbar is
b) Magnetization method;
c) Testing instruments and equipment;
d) Magnetization current type and its parameters;
e) Surface state;
f) Magnetic particle (type, color, supplier);
g) Magnetic particle application method;
h) Minimum light intensity;
i) Nonconductive surface contrast enhancer (if used);
j) Black light irradiance (if used).
4.3.3 It shall compile the operating instructions in accordance with the contents
of the technical specifications and the testing requirements of the workpiece to
be tested. The contents shall, in addition to complying with the requirements of
NB/T 47013.1, include at least.
a) Testing region and surface requirements;
b) Testing environmental requirements;
c) Testing technical requirements. sensitivity test piece indication,
magnetization method, mag......
Related standard:   NB/T 47013.10-2015  NB/T 47013.11-2015
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