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GB/T 4162-2008 English PDF (GBT4162-2008)

GB/T 4162-2008 English PDF (GBT4162-2008)

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GB/T 4162-2008: Forged and rolled steel bars -- Method for ultrasonic testing

This standard specifies the requirements, test method, procedure, result assessment, quality grade, record and report of ultrasonic test for forged and rolled steel bars.
GB/T 4162-2008
GB
NATIONAL STANDARD OF THE
PEOPLE 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 and 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

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