GB/T 4162-2008 (GB/T 4162-2022 Newer Version) PDF English
GB/T 4162-2008 (GB/T4162-2008, GBT 4162-2008, GBT4162-2008)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 4162-2022 | English | 185 |
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Method for ultrasonic testing of forged and rolled steel bars
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| GB/T 4162-2008 | English | 70 |
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Forged and rolled steel bars -- Method for ultrasonic testing
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| GB/T 4162-1991 | English | 239 |
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Forged and rolled steel bars--Method for ultrasonic examination
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Newer version: GB/T 4162-2022 Standards related to (historical): GB/T 4162-2022
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GB/T 4162-2008: PDF in English (GBT 4162-2008) GB/T 4162-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.20
H 26
Replacing GB/T 4162-1991
Forged and Rolled Steel Bars -
Method for Ultrasonic Testing
ISSUED ON. MAY 13, 2008
IMPLEMENTED ON. NOVEMBER 11, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Requirements ... 6
5 Test methods and procedures ... 9
6 Testing result assessment ... 11
7 Quality level ... 12
8 Record and report ... 12
Foreword
This standard is not equivalent to ASTM E2375-04 "Forged and Rolled Products -
Method for Ultrasonic Testing".
This standard replaces GB/T 4162-1991 "Forged and Rolled Steel Bars--Method for
Ultrasonic Examination".
Compared with GB/T 4162-1991, the changes of this standard are listed below.
— The diameter (thickness) application range in this standard (12 mm ~ 250 mm)
replaces the one in the previous standard (20 mm ~ 250 mm);
— Add a Chapter "terms and definitions";
— Add the requirements for the physical dimensions and specifications of
reference blocks;
— Modify the reference block for transverse wave test;
— Add the dimension-comparison reference tables of quality grade and cross hole;
— Delete the permissible error of buried depth and discontinuous depth for
equivalent flat bottomed hole in previous standard;
— Add the water-path adjustment, divisional test, distance amplitude
compensation and the arrangement of alarm level when immersion method test
is carried out during test.
— Add discontinuous strip-length-measurement method and the discontinuous
assessment contents for transverse wave test in discontinuous assessment;
— Modify the Class AAA quality in the previous standard; add Class C in this
standard; and Class C in the previous standard is modified as Class D in this
standard.
This standard was proposed by the China Iron and Steel Association.
This standard shall be under the jurisdiction of the National Steel Standardization
Technical Committee.
Chief drafting organizations of this standard. Special Steel Branch Company, Baoshan
Iron & Steel Co., Ltd., and China Metallurgical Information and Standardization
Institute
Chief drafting staffs of this standard. Ni Xiumei, Wang Yongling, Jiang Yimin, Zhao
Forged and Rolled Steel Bars -
Method for Ultrasonic Testing
1 Scope
This standard specifies the requirements, test method, procedure, result assessment,
quality grade, record and report of ultrasonic test for forged and rolled steel bars.
This standard is applicable to the forged and rolled steel bars whose diameter
(thickness) is 12mm ~ 200mm and is tested with ultrasonic (longitudinal wave or
transverse wave) impulse reflection method (contact method or immersion method);
this standard may also act as the reference for the test of other forged and rolled bars.
This standard is not applicable to austenite scorched steel bars.
2 Normative references
The following standard contains the provisions which, through reference in the
following text, constitute the provisions of this standard. For dated reference, the
subsequent amendments (excluding correction) or revisions of these publications do
not apply. However, parties who reach an agreement based on this standard are
encouraged to investigate the possibility of applying the most recent editions of the
standards indicated below. For undated references, the latest edition of the normative
document referred to applies. For undated references, the latest edition of the
normative document referred to applies.
GB/T 9445 Non-Destructive Testing - Qualification and Certification of Personnel
GB/T 12604.1 Non-destructive Testing - Terms Used in Ultrasonic Testing
GB/T 18694 Non-destructive Testing - Ultrasonic Inspection - Characterization of
Search unit and Sound Field
B/T 18852 Ultrasonic Non-destructive Testing - Reference Blocks and Test
Procedures for the Characterization of Contact Search Unit Beam Profiles
JB/T 10061 Commonly Used Specification for A-Mode Ultrasonic Flaw Detector Using
Pulse Echo Technique
3 Terms and definitions
The established terms and definitions in GB/T 12604.1 are applicable to this standard.
4 Requirements
4.1 Provisions
If ultrasonic test is carried out according to this standard, the types and quality grades
etc. of ultrasonic shall be specified in contract or related documents by the supplier
and demander.
4.2 Personnel qualification
The personnel who are engaged in executing this standard shall be trained according
to GB/T 9445 or the related standard, and then receives a qualification certificate. The
personnel who are engaged in signing and issuing test report shall receive the Class II
or above Class II qualification certificate.
4.3 Couplant
4.3.1 Immersion method
Water which is free from extraneous material that affects ultrasonic test and air bubble
may be used. Proper preservative and lubricant may be added to prevent corrosion
and reducing the bubble formation on steel bar and probe.
4.3.2 Contact method
Water, oil, fat and water soluble gel etc. may be used; besides, the viscosity and
surface wettability of couplant shall be proper enough to ensure that the ultrasonic
energy will transmit into steel bars perfectly.
4.4 Reference block
4.4.1 The material whose acoustic property is the same as or similar to the acoustic
property of the tested steel bar shall be adopted.
4.4.2 Reference block shall be carefully inspected with ultrasonic test method under
high sensitivity in advance, but attention shall be given not to affect the used echo
wave existence.
4.4.3 If the test diameter of longitudinal wave is not greater than 200mm, the
reference block whose specification is close to the one in Table 1 or Figure 1 may be
used; if the test diameter is greater than 200 mm, plane-block may be used.
6 Testing result assessment
6.1 Echo signal record
According to the maximum sensitivity indicated in the quality grade, any echo signal which
is more than or equals to the sensitivity level shall be recorded in the scanning process.
The record may be coordinate figures or C-scanning figures, which may indicate the
position and of the echo signal.
6. 2 Bottom wave loss assessment
Carried out the bottom wave measurement via the straight sound beam under lower gain,
compare it with the bottom wave of the normal part, if the bottom wave loss is over 50%
and not caused by the surface conditions and misalignment, the bottom wave is
incompetent.
6.3 Noise assessment
The noise exceeding the alarming level is considered disqualified. The alarming level of
titanium alloy shall be set just over the noise level, but shall not exceed 70% of the
detection sensitivity.
6.4 Discontinuity assessment
6.4.1 Longitudinal wave
6.4.1.1 Single discontinuity
Compare the flat bottomed hole echo specified in Table 4 of similar buried depth with the
discontinuous echo; the discontinuities that exceed the specification in Table 4 are
deemed as disqualified.
6.4.1.2 Multiple discontinuities
Move the probe to find the maximal echo of each discontinuity; measure the distance of
the multiple discontinuity. If the distance was less than the specification in Table 4, It is
deemed as unqualified.
6.4.1.3 Rectangle discontinuity
Measure the length according to the following method. If the length exceeds the
specification in Table 4, it is deemed as unqualified.
a) On the test block of rectangle discontinuous flat bottomed holes with similar buried
depth, make the echo on the flat bottomed hole to reach its maximum; regulate the
instrument to full amplitude and move the probe to opposite directions along the
Table 4 Quality grade (mm)
Quality
grade
Single discontinuity
flat bottomed hole
diameter
Multiple discontinuities strip discontinuities
Bottom
wave loss Noise Flat bottomed
hole diameter Distance
Flat bottomed
hole diameter Length
AAA 0.8 0.4 25 0.4 3.2 50%
Alarming
level
AA 1.2 0.8 25 0.8 13 50%
A 2.0 1.2 25 1.2 25 50%
B 3.2 2.0 25 2.0 25 50%
C 3.2 Not applicable 50%
D 4.0 Not applicable
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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