GB/T 2970-2016 PDF English
US$85.00 · In stock · Download in 9 secondsGB/T 2970-2016: Method for ultrasonic testing of thicker steel plates Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 2970: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 2970-2016 | English | 85 |
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Method for ultrasonic testing of thicker steel plates
| Valid |
| GB/T 2970-2004 | English | 399 |
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Thicker steel plates -- Method for ultrasonic inspection
| Obsolete |
| GB/T 2970-1991 | English | 359 |
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Thicker steel plate--Method for ultrasonic inspection
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GB/T 2970-2016: Method for ultrasonic testing of thicker steel plates---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT2970-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.20
H 26
Replacing GB/T 2970-2004
Method for ultrasonic testing of thicker steel plates
Issued on. FEBRUARY 24, 2016
Implemented on. SEPTEMBER 1, 2016
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... 4
2 Normative references... 4
3 General requirements... 4
4 Contrast samples... 5
5 Testing instruments and equipment... 8
6 Test conditions and methods... 9
7 Defect determination and assessment... 10
8 Quality grading of steel plates... 12
9 Testing report... 12
Appendix A (Normative) Methods for transverse wave testing of steel plates 13
Appendix B (Normative) Property requirements of dual-crystal probes... 17
Foreword
This Standard is drafted according to the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 2970-2004 Thicker steel plates - Method for
ultrasonic inspection. Compared with GB/T 2970-2004, the major technical
changes are as follows.
— MODIFY the debugging method for sensitivity of dual-crystal straight
beam probes. For the steel plates with the thicknesses of greater than
60mm, the debugging method for testing sensitivity of dual-crystal
straight beam probes is consistent with that of single-crystal straight
beam probes.
— STIPULATE similar acoustic properties, which is “the acoustic attenuation
bias shall be within the range of ± 25%”.
— ADD the provisions on the contrast samples of the single-crystal straight
beam probes for the steel plates with the thicknesses of greater than
200mm.
— ADD “rectangular groove” to the “dynamic samples”.
— MODIFY the test method of defect boundaries and lengths.
— ADD Appendix A (Normative).
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of the National Technical
Committee for Standardization of Steels (SAC/TC 183).
Drafting organizations of this Standard. Central Iron and Steel Research
Institute, Eddysun (Xiamen) Electronic Co., Ltd, China Metallurgical Information
and Standardization Institute, Sichuan Xingtianyuan Material Testing
Technology Co., Ltd, and NCS Testing Technology Co., Ltd.
Main drafters of this Standard. Zhang Jianwei, Fan Hong, Lin Junming, Dong
Li, Liu Changqing, Zhang Ke, Shen Haihong, Jia Huiming, Yuan Gangqiang and
Zhang Weixu.
The previous released editions replaced by this Standard are as follows.
— GB/T 2970-1982, GB/T 2970-1991 and GB/T 2970-2004.
Method for ultrasonic testing of thicker steel plates
1 Scope
This Standard specifies the general requirements, contrast samples, testing
instruments and equipment, test conditions and methods, defect determination
and assessment, quality grading of steel plates, and testing report of the
ultrasonic testing of thicker steel plates.
This Standard is applicable to the ultrasonic testing of the steel plates with the
thicknesses of not less than 6mm and used in pressure elements, bridges,
buildings, shipbuilding, steel structures, pipelines, moulds, etc. The austenitic
stainless steel plates can also make reference to this Standard.
2 Normative references
The following documents are essential to the application of this document. For
dated references, only the editions with the dates indicated are applicable to
this document. For undated references, only the latest editions (including all the
amendments) are applicable to this document.
GB/T 8651 Flaw detection method by the ultrasonic plate wave for metal
plates
JB/T 10061 Commonly used specification for A-mode ultrasonic flaw
detector using pulse echo technique
3 General requirements
3.1 The surfaces of the tested plates shall be flat and smooth along with
uniform thickness. There shall be no droplets, oil stains, corrosions and other
dirt.
3.2 During testing, the internal constitutions of the tested plates shall not
generate interference echoes affecting the testing.
3.4 The personnel engaged in ultrasonic testing of steel plates shall be trained,
and obtained Level 1 qualification certificate and above of professional
ultrasonic flaw detection issued by certification authorities.
3.5 It is allowed to scan manually and automatically. It is allowed to use the
piezoelectric (contact and immersion methods) and electromagnetic ultrasonic
testing methods.
3.6 The adopted ultrasonic wave shapes can be longitudinal waves,
transverse waves and plate waves. When using transverse waves as the
supplement of the longitudinal wave testing, it shall be agreed upon by the
supply and requisitioning parties when ordering goods.
4 Contrast samples
4.1 The materials and acoustic properties of the contrast samples shall be the
same or similar with those of the tested steel plates (the acoustic attenuation
bias shall be within the range of ± 25%). Furthermore, ENSURE that there are
no defects affecting the testing inside.
4.2 When using a dual-crystal straight beam probe to test the steel plates with
the thicknesses of not greater than 60mm, the contrast samples being used are
shown in Figure 1.
4.3 When using a single-crystal straight beam probe for testing, the contrast
samples shall conform to the provisions of Figure 2 as well as Tables 1 and 2.
4.4 When using the piezoelectric or electromagnetic automatic ultrasonic
testing method, the long side of the dynamic contrast sample shall be parallel
to the calendaring direction. In the meantime, the end surface shall be straight.
It is allowed to make reference to Figure 3 for the preparation of the dynamic
contrast sample.
5 Testing instruments and equipment
5.1 Flaw detector
The properties of the flaw detector being used shall conform to the relevant
provisions of JB/T 10061.
5.2 Transducer
5.2.1 For the selection of piezoelectric straight beam probes, SEE Table 3.
5.2.2 For the dual-crystal straight beam probes whose tested plates are not
greater than 60mm in thickness, the properties shall conform to the
requirements of Appendix B.
5.2.3 When using the plate waves for flaw detection, the selection of the wave
shape, wave mode and test method shall conform to the requirements of GB/T
8651.
5.2.4 When using the transverse waves for flaw detection, EXECUTE
according to the Appendix A of this Standard.
6 Test conditions and methods
6.1 Testing time
In principle, the testing shall be conducted after steel plate processing. It is also
allowed to be conducted after rolling.
6.2 Tested surface
It is allowed to test from any rolled surface of the steel plate.
6.3 Testing sensitivity
6.3.1 When using the piezoelectric probes, the testing sensitivity shall be
included in the surface coupling acoustic energy loss (dB) between contrast
sample and tested steel plate.
6.3.5 In dynamic status, ADJUST the testing sensitivity of each channel
according to the methods given in Sections 6.3.1 to 6.3.4.USE the dynamic
samples described in Section 4.4 to determine the dynamic underreporting and
misinformation. SCAN afterwards.
6.4 Probe scanning forms
6.4.1 When using the piezoelectric probes, the probes scan along the
direction perpendicular to the steel plate’s calendaring direction, and the
parallel lines with the spacing of not greater than 100mm.
6.4.2 When using the dual-crystal probes, the sound insulation layers of the
probes shall be parallel to the calendaring direction (SCAN along the direction
perpendicular to the calendaring direction).
6.4.3 According to the requirements of the contract or technical agreement or
drawings, it is allowed to perform other forms of scanning.
6.5 Testing speed
The testing speed shall not affect the flaw detection. However, when using the
flaw detectors without automatic alarm function for scanning, the testing speed
shall not be greater than 200 mm/s.
7 Defect determination and assessment
7.1 Defect records
During testing, RECORD the following circumstances discovered within the
testing sensitivity.
7.2 Determination method for defect boundaries or indicating lengths
7.2.1 After discovering the defects during testing, TEST around to determine
the extension of the defects.
7.2.2 When using a dual-crystal probe to determine the defect boundaries or
indicating lengths, the probe’s moving direction shall be perpendicular to its
sound insulation layer.
7.2.5 When determining the defect boundary or indicating length in Section
7.1 c) of this Standard, MOVE the probe, until the first reflected wave of the
steel plate’s bottom surface (or end) increases to 50% of the full scale of the
fluorescent screen under the condition of testing sensitivity.
7.2.6 When using the automatic ultrasonic method for testing, after
discovering suspected defect, QUANTIFY and POSITION the defect manually.
USE the manual method to accurately determine the defect indicating length
and boundary as well.
7.4 Assessment rules of single defect indicating area
7.4.1 For single defect, CONSIDER its showing area as the single indicating
area of this defect.
7.5 Assessment rules of defect density
Within any 1m × 1m testing area, DETERMINE according to the percentage of
the defect area.
8 Quality grading of steel plates
8.1 For the quality grading of steel plates, SEE Table 4.
8.2 Within the testing area 50mm around the steel plate (when the plate
thickness is greater than 100mm, TAKE half of the plate thickness) and within
25mm away from both sides of the groove predetermined line, the single defect
indicating lengths shall not be greater than or equal to 50mm.
9 Testing report
The testing report shall include the following contents.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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