This standard specifies the ultrasonic inspection comparison specimens, inspection instruments and equipment, inspection conditions and methods, defect determination and evaluation, quality classification of steel plates, inspection reports, etc. for thick steel plates. This standard is applicable to ultrasonic inspection of steel plates with a thickness of not less than 6 mm for boilers, pressure vessels, bridges, buildings, shipbuilding, steel structures, pipelines, molds, etc. Austenitic stainless steel plates can also refer to this standard. GB/T 2970-2004 Ultrasonic inspection method for thick steel plates GB/T2970-2004 Standard download decompression password: www.bzxz.net

IN 77. 40. 2U
National Standard of the People's Republic of China
GB/T2970--2004
Generation/297199
Thick steel plates--Methnd for ultrasonic inspection
Thicker steel plates--Methnd for ultrasonic inspection2004-05-09Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of Standardization of the People's Republic of China
2004-10-01Implementation
National Standard (H/12970--1SS1)International Standard for Ultrasonic Inspection of Steel Plates. Compared with GB/297U-11, this standard has the following changes: The applicable scope of this standard includes austenitic stainless steel plates: Double-piece straight-change head can detect the thickness of the steel plate. The original range is expanded from 2 cram to nm. The test specimens for dynamic inspection are simplified:
The performance requirements of the product straight probe have been changed. The requirements for single pits that are not allowed to exist in the steel plate have been improved: This standard is a normative standard.
This standard is issued by the China Steel Industry Association, and is under the jurisdiction of the National Steel Standardization Technical Committee. The drafting unit of this standard is the Iron and Steel Research Institute, the Metallurgical Industry Information Standard Research Institute, and the main drafters of this standard are: Zhang Chun, Zhang Jianwei, Fan Hong, Kuan Lanming, and Zhiyi. The previous versions of this standard are: GD 2370-19H2.G (1/7 2970-199). GB/T2970-2004
1 Scope
Thick steel plate ultrasonic glass inspection method
CB/T 29702004
This standard specifies the thick steel plate overproduction wave inspection comparison specimens, inspection equipment and modification, inspection conditions and methods, the determination and evaluation of defects, and the effectiveness of the wall repair report.
The standard is applicable to: boilers, pressure vessels, bridges, buildings, shipbuilding, structures, lines, and molds. The production of stainless steel plates can refer to the standard, 2 normative reference documents
The clauses in the listed documents are not necessarily the terms of this standard. For any document with a date, all subsequent amendments (excluding those in parentheses) or revisions are not applicable to this standard. However, the parties that have reached an agreement on the revision are encouraged to explore whether a new version can be developed as soon as possible. For any document without a date, the latest version is applicable to this standard: GB/T3S:1 Gold plate cross-talk board flaw detection method GBT260! Ultrasonic testing technology
J3/3031A type external pulse flaw detection general technical requirements
3 General requirements
3.1 The surface of the plate should be flat, smooth, and of uniform thickness. There should be no dripping, oil corrosion and other contaminants. 3.2 The metallographic structure of the material should be inspected, and the interference echo produced by the inspection should be avoided during the inspection. 3.3 The inspection site should avoid strong magnetic fields and strong 3.4 The ultrasonic flaw detection personnel shall be supervised by the competent department and have obtained the professional certificate of ultrasonic flaw detection and the qualification certificate of ... Liquid diffusion and piezoelectric probes or electric probes have been tested. 3.6 The specified section can be used for dynamic wave testing. Wave analysis 4 Comparison sample 4.1 The material and performance of the sample after comparison should be the same as the calcium plate to be tested, and the plate should be guaranteed to have no defects that affect the test. 4.2 When using double wafers to replace the steel plate with a thickness not greater than ! m, the comparison sample is shown in the figure. 4.3 Single product wafer Replace the test film and compare the test sample with the requirements of Table 2, Table 1 and Table 2: 4.4 When using piezoelectric or electric tunneling ultrasonic testing methods, the long side of the test sample is produced in two ways, the end face should be straight, and the tolerance should be less than 2 times the plate thickness. The location of the defect is as shown in Figure 3. 4.5 For detailed test forms of the test using lunar and glaze waves, see [H/T865 and JH73-15S1 radiographic recording TI.1
GB/T 2970--2004
Bottle thickness = 60mm double crystal straight probe replacement test sample
Note, vertical point, running test block thickness can be measured, single piece straight probe test sample
Single limit is for the meter
Year is for the new
Test decision number
Sample call
Single piece mutual probe comparison sample
Inspection and judgment number
22--42
60--luc
2-1:~-16k
2:62~226
Look at the whole surface to the flat hole height S!
Han 2 verticality & change with sample coursebZxz.net
_60 -- 2G
GB/T2970-2004
Unit is old meter
Trial use!
Single collection is meter
Unit is coming
Comparison~: . The second reading is the second flat degree of the human body, plus mica, left double mining, the meal is thick:/2, the defect leads to high anti-0 1~ 3 u133 For the dynamic surface system, please go deep into m:
22.34T defect length x width nmm
Appropriate position increase effective measurement through the hole,
Figure 3 Dynamic specimen for automatic ultrasonic testing
5 Inspection receiver and equipment
5.1 Probe agreement
The performance of the flaw detection receiver shall comply with the relevant provisions of GB/T6e51 or JB/T103S1, 5.2 Competitive end
5.2.1 Selection of piezoelectric re-probe3,
No matter which probe is selected, it must be ensured that Effective detection area, plate thickness is greater than the center r =, if the performance index of the double-film straight probe can reach 3
GB/T2970-2304
single-film straight technical head, effective products can be selected,
Education rate: mm
>:5--m
Table 3 Selection of deep head
Chuancaihui
Product film straight meaning
Double-film mutual exploration single-film mutual meaning
Total product film depth
5.2.2 The performance of the double-film straight control head should meet the requirements of Appendix A of the Science and Technology Council, 5.2.3 The wave type, mold and inspection method shall comply with the requirements of 1R/T965. 5.2.4 When adopting the deep material, the test method of 17.50-190 can be used as reference. 7H.6 Inspection conditions and methods 6.1 Inspection time In principle, it can be carried out after the steel tax processing is completed, and it can also be carried out during the rolling process. 6.2 Inspection surface can be moved from the steel plate to the finished surface. The surface of the inspected plate should be flat and not sensitive to the live The impact of the vehicle's north reflection on the whole, and the test, continent; line, etc.,
6.3 The number of test sensitivities
..1 The positive electrode probe should be compared with the surface of the vehicle being tested. The loss of the whole vehicle (cI3) 6.3.2 The double-chip Lu probe is used for pulling the test. Use the sample in Figure 1 or in the hand-held steel suction 1. Adjust the first bottom wave height to the full height: the south control sensitivity must be 10 as the control test fork. 33 Use a single-chip straight deep head test. The sensitivity of the test flat bottom hole in Figure 2 is selected. The second reflection is still more than three full moments. The major push.
6.3.4 According to the depth of the head 3 times the depth of the sun, the receiving sensitivity H is determined by the potential echo height 9, 6.3.5 Under the actual state, the corresponding block sinking in the second speed test described in door 2 can also be used. In the absence of impurities, the fast person J. Defects are reflected in the wet signal. Only the thickness of the light must be summer, and then increased by 10 as the initial test record. 6.4 Probe scanning form
6.4.1 Compared with [the probe, the probe is multiplied by the parallel lines with a delay of no more than m and the spacing is not greater than m to scan the same circumference of the same center m. The original plate is half: and The city is scheduled to be determined by the supply and demand effect in the contract. The specific configuration of the technical office is determined in the contract. The two services are 25mrr. The inner edge is then expanded: 6.4.2 When using a chip probe: the probe is parallel to the extension direction (scanning in the rolling direction! E.4.3 According to the contract or technical agreement or drawing requirements, a common form of scanning or some scanning can also be performed. 6.4.4 Self-verification inspection number 4 is parallel to the steel dialing direction. 6.5 Inspection speed
Jin Jiandi degree does not affect the deep defense. However, when scanning the deep damage equipment with no alarm function: the inspection degree is not large. Fcc r*x.
7 Determination and evaluation of the lack of sound
7.1 During the inspection process, the following situations should be recorded. 7.1., the first reflection liquid is missing: the height is greater than or equal to 50% of the ambient temperature. 7.1.2 When the first reflection wave from the surface reaches the full scale, the height of the first reflection wave (F) of the trap is greater than or equal to 5% of the first reflection wave (B) of the bottom surface (extreme part).
7.1.3 When the first reflection wave (B) of the bottom surface (extreme part) is less than 50% of the full scale: : 7.2 Defect boundary or indication length and width determination method 7.2.1 After the defect is confirmed, the defect shall be inspected in the register to determine the extension of the defect. GB/T 2979—2004
7.2.? When using a probe to determine the boundary or indication length of a defect, the probe shall be used in a vertical manner. 7.2.3 Use the half-higher sign to indicate the length of the probe or the indication length. 7.2.4 When determining the boundary indication length of the defect in 7.-.2, move the probe, move the bottom surface (or end) of the probe to 505 of the full scale of the first reflection wave plate under the inspection bar. At this time, the center point of the probe is the edge point of the entire defect. 7.2.5 The defect can be located by the inspection method. If it is found, the defect can be prevented. The indication length can be determined by the workmanship. 7.3 Evaluation rules for defect indication length
The length of a single defect is taken as the indication length of the defect. If the indication length is less than 42mm, its length may not be recorded.
7.4 Evaluation rules for single defect indication area 7.4.1 The area of ​​a single defect is taken as the indication area of ​​the defect. 7.2.2 When the spacing between multiple defects is less than 1m or the spacing between adjacent defects is less than the indication length (measured by the ratio of the indication length to the indication length), the sum of the defect areas is also taken as the indication area of ​​the single defect. 7.5 Evaluation of defect density Rules
The percentage of defect area in the inspection area is determined by the percentage of defect area in the inspection area. 8 Quality grading of copper plate
8.1 Quality grading of copper plate is shown in Table
2 The upper center of the plate periphery is mm (when the plate thickness is greater than 100mm, take one tenth of the plate thickness) The inspectable area and the two sides of the plate top line must be within 35r, and the length of the single core shall not be greater than or equal to 5n. Table 4 Quality grading of steel plate
Not allowed in the single
Inspection report
Defects in descending order are not allowed to be /u.0
The whole inspection report should include the following content:
Not allowed in In the negative heart tooth
depression, etc.
) standard method ratio: material brand, industry thickness reputation: in, x shock time
Nan Nei not only allowed the money in
Bank of A Ji Bai Chemical: Xue
Next year, the number of defects will be trained
surface record on
Inspection parts: deep damage instrument number, operating head type, probe nominal rate, crystal size, donation mixture, payment ratio test sample, etc.: h
Inspection about: including defect location and distribution of defects, quick and brief, etc. Others must be: inspection person, report issued by the person's name and qualifications, etc., long-term announcement issued H period, etc.: 5
GA/T 2970—2004
A.1. Probe performance
A.1.1 Distance-amplitude characteristic curve
Appendix A
(Normative appendix)
Performance requirements for dual-element straight probes
Use the sample shown in Figure 1 to measure the echo height of each thickness, and make the characteristic curve shown in Figure 1. The following requirements must be met: A.1.1.1 The maximum thickness to be tested and the maximum echo height difference should be within the range of 0cH-6cB. For dual-element probes with distance compensation, the echo height of the maximum thickness to be tested and the maximum echo height after compensation should also be within the range of d. A.1.1.2 The echo height at a distance of mn and the maximum echo height difference should be within the range of 0R-6. For the instrument that can compensate for the distance, the double-chip straight probe used in the following items shall be compensated for. The return height at a height of 3mM shall be 0-6B:
A.1.2 The surface leakage return height of the double-chip probe measured by the method must be 40% lower than the method height. A, 1.3 The difference between the echo height of the hole of the sample A.2 and the ground echo height must be within 1+?. 4.1.4 Effective beam width
Align the probe to the A.2 test block, AmⅡ flat bottom hole, and move parallel to the sound field of the double-chip probe. The return height decreases with the side of the 6-meter range. All the required degrees must be greater than m. Standard bottle!
Fast 1 style maximum echo when two degrees:
Maximum thickness of the sense,
Figure, 1 distance - amplitude characteristic curve
Note: Weizhong upper single and fire mm1
Figure A2 special instrument and deep head combination performance sample GR/T2970-20042. The surface leakage height of the double-piece probe must be 40° lower than the surface leakage height of the double-piece probe measured by the method. A, 1.3 degree (measured by the sample in Figure 4.2) The difference between the echo height of the hole in the sample in Figure A.2 and the ground echo height must be within a range of 1+?. 4.1.4 Effective beam width
Align the probe to the A.2 test block, AmⅡ flat bottom hole, and move parallel to the sound field of the double-piece probe. The echo height decreases with the side of the 6-degree range. The total degree must be greater than m. Accurate bottle!
Fast 1 style maximum echo when two degrees:
Maximum thickness of the sense,
Figure, 1 distance - amplitude characteristic curve
Note: Weizhong upper single and fire mm1
Figure A2 special instrument and deep head combination performance sample GR/T2970-20042. The surface leakage height of the double-piece probe must be 40° lower than the surface leakage height of the double-piece probe measured by the method. A, 1.3 degree (measured by the sample in Figure 4.2) The difference between the echo height of the hole in the sample in Figure A.2 and the ground echo height must be within a range of 1+?. 4.1.4 Effective beam width
Align the probe to the A.2 test block, AmⅡ flat bottom hole, and move parallel to the sound field of the double-piece probe. The echo height decreases with the side of the 6-degree range. The total degree must be greater than m. Accurate bottle!
Fast 1 style maximum echo when two degrees:
Maximum thickness of the sense,
Figure, 1 distance - amplitude characteristic curve
Note: Weizhong upper single and fire mm1
Figure A2 special instrument and deep head combination performance sample GR/T2970-2004
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