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GB/T 5777-2008 (GB/T5777-2008)

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GB/T 5777-2008English85 Add to Cart 0--3 minutes. Auto-delivery. Seamless steel pipe and tubing methods for ultrasonic testing Obsolete

GB/T 5777-2008: PDF in English (GBT 5777-2008)
GB/T 5777-2008
ICS 77.040.20
H 26
Replacing GB/T 5777-1996
Seamless Steel Pipe and Tubing Methods
for Ultrasonic Testing
(ISO 9303.1989 (E), MOD)
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Ultrasonic Testing Principle ... 6 
4 Ultrasonic Testing Methods ... 6 
5 Reference Block ... 6 
6 Ultrasonic Testing Equipment ... 9 
7 Ultrasonic Testing Conditions ... 10 
8 Ultrasonic Testing Procedures ... 11 
9 Result Evaluation ... 12 
10 Ultrasonic Testing Report... 13 
Annex A ... 14 
Annex B ... 16 
Annex C ... 18 
Annex D ... 20 
Annex E ... 21 
This standard is modified in relation to ISO 9303.1989 (E) "Seamless and welded
(except submerged arc-welded) steel tubes for pressure purposes - Full peripheral
ultrasonic testing for the detection of longitudinal imperfections".
This standard is redrafted according to ISO 9303.1989 (E). Comparison list between
the Chapter and Article numbers of this standard and those of ISO 9303.1989 (E) is
shown in Annex A.
This standard was modified during the adoption of international standard. Those
technical differences have already been marked with vertical single-line on the margin
of relevant clauses. The list for the technical differences and their reasons is shown in
Annex B for reference.
For ease of use, the following editorial revisions are made for ISO 9303.1989 (E).
— "This international standard" is revised into "this standard";
— The foreword and introduction of ISO 9303.1989 (E) are deleted.
This standard replaces GB/T 5777-1996 "Seamless steel pipe and tubing-Methods for
ultrasonic testing". There have been some significant changes in this standard over
GB/T 5777-1996 as follows.
— "Electromagnetic ultrasonic testing may be carried out according to this
standard" is added in the scope (see Chapter 1);
— Testing and testing methods for oblique defects are added (see Chapter 4 and
Annex B);
— The restriction for the position of manual slot on the tube end is modified
(Chapter 5 of GB/T 5777-1996; Chapter 5 of this standard);
— Dimension and code number of artificial defect is modified (Chapter 5 of GB/T
5777-1996; Chapter 5 and Annex E of this standard);
— Probe working frequency is modified from 2.5MHz~10MHz to 1MHz~15MHz
(Chapter 6 of GB/T 5777-1996; Chapter 6 of this standard).
Annex A, Annex B and Annex E of this standard are informative. Annex C and Annex
D are normative.
This standard was proposed by China Iron & Steel Association.
Seamless Steel Pipe and Tubing Methods
for Ultrasonic Testing
1    Scope 
This standard specifies the ultrasonic testing principle, ultrasonic testing methods,
reference block, ultrasonic testing equipment, ultrasonic testing conditions, ultrasonic
testing procedures, result evaluation and ultrasonic testing report for seamless steel
This standard is applicable to the ultrasonic testing for longitudinal and transverse
defects of seamless steel tubes for various purposes. The testing methods stated in
this standard are mainly applicable to test the defects that destroy the metal continuity
of steel tubes, but can not effectively test laminar defects.
This standard is applicable to the inspection of tubes with an outside diameter greater
than or equal to 6 mm, and with a wall thickness-outside diameter ratio less than or
equal to 0.2. For tubes with a wall thickness-outside diameter ratio greater than 0.2,
one of the methods specified in annex C shall be used by agreement between
manufacturer and purchaser.
Electromagnetic ultrasonic testing may be carried out according to this standard.
2    Normative References 
The following standards contain provisions which, through reference in this text,
constitute the provisions of this standard. For dated references, all subsequent
modifications (excluding corrigendum) or revisions are not applicable to this standard.
However, all parties who enter into an agreement according to this standard are
encouraged to study whether the latest editions of these documents are applicable.
For undated references, the latest edition of the normative document referred to
GB/T 9445 Non-destructive testing - Qualification and certification of personnel
YB/T 4082 Measurement method of comprehensive properties for automatic
ultrasonic flaw detection system for steel tubes
JB/T 10061 Commonly used specification for A-mode ultrasonic flaw detector
using pulse echo technique
3    Ultrasonic Testing Principle   
Interconversion between electric energy and sound energy can be realized by
ultrasonic probe; and the physical properties of ultrasonic traveling in an elastic
medium are the basis of steel tube ultrasonic testing principle. Ultrasonic beams
emitted along a particular direction will generate wave reflection when encounter
defects during travel in the tube, defect echo is picked up by ultrasonic probe, and
then treated by defect detector to obtain defect echo signals and hereby give out
quantitative defect indication.
4    Ultrasonic Testing Methods 
4.1 Steel tubes shall be tested with shear wave reflection method under the relative
move state of probe and steel tube. During automatic or manual testing, sound beams
shall scan all surfaces of steel tubes. Both ends of steel tubes can not be tested
effectively during the automatic testing; this area is regarded as the blind area of
automatic testing. The quality of this area may be guaranteed by the manufacturer
through adopting effective methods.
4.2 When the longitudinal defects are tested, the sound beams shall travel along the
circumferential direction inside the tube wall; when transverse defects are tested, the
sound beams shall travel along the tube axis direction inside the tube wall.
Longitudinal and transverse defects shall be tested in two opposing directions of steel
4.3 The manufacturer may only test the longitudinal defects if transverse defects are
not required by the purchaser. Longitudinal and transverse defects may be tested only
in one direction of steel tubes by agreement between manufacturer and purchaser.
4.4 Ultrasonic testing may be carried out for oblique defects by agreement between
manufacturer and purchaser. See Annex D for the ultrasonic testing of oblique defects
in seamless steel tubes.
4.5 During automatic or manual testing, coupling media with good coupling effects
and without damage to the surfaces of steel tubes shall be adopted.
5    Reference Block   
5.1 Purpose
The reference block is used for debugging of ultrasonic testing equipment, testing of
overall performance and timing verification during the application process. Artificial
defect on the reference block is the basis for evaluating natural defect equivalent,
6.1.2 The adjustable range of defect detector repetition frequency shall meet the
requirements of defect detection technology.
6.1.3 Defect detector shall be possessed of automatic alarm or defect signal output
6.2 Probe
6.2.1 The working frequency of piezoelectric ultrasonic probe may be selected from
1MHz ~15MHz; crystal plate length or diameter of single probe shall not be greater
than 25 mm, but shall not be greater than 12mm when artificial defect length is less
than 20mm.
6.2.2 Line focusing or point focusing probe may be used for piezoelectric ultrasonic
6.3 Test device
Test device shall be possessed of high-precision adjusting mechanism for probe
relative to the position of steel tube, and can be reliably and tightly locked, or can
realize good machinery tracing, to guarantee constant incident conditions of sound
beam to st...
(Above excerpt was released on 2016-02-24, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT5777-2008