BS/EN 10307-2001 pdf download.Non-destructive testing Ultrasonic testing of austenitic and austenitic—ferritic stainless steels flat products of thickness equal to or greater than 6 mm (reflection method).
8.3 Calibration blocks
Calibration blocks shall conform to the requirements detailed in EN 12223
8.4 Reference blocks
References blocks shall be made from a material having siimlar acoustic properties to the product to be examined. The surface conditn of the reference block shall be rep(esenlative of the surface condition of the product La be examined, Unless otherwise specified the reference block shall contain at least three reflectors covering the entire depth range under examination
The bottom of the holes shall be as flat as practicable, parallel to the ultrasound entry surface and free from pits or score marls that sgnificantly degrade its ultrasonic reflectivity. The tolerance on the diameter of the flat-bottomed hole or width of recess shall be 1 5 %.
8.5 Couplant
The couplant used shall be appropriate to the application. The same type of couplant shall be used for calibration, setting sensitivity, scanning and evaluation of discontinuities,
After examination. couplant shall be removed if its presence could adversely affect later manufacturing or inspection operations or the integrity of the product
NOTE Wate is normally used but other couplng media may be used at the discretion of the supfrier.
9 Routine calibration and checking
The combined equipment (instrument and probes) for manual testing shall be calibrated and checked in uuorduncc with thc rcquircrnciit dctuilcd in EN 12668 3.
10 Stage of manufacture
Ultrasonic testing shall be performed in the delivery condition unless otherwise agreed at the time of enquiry arid order.
Calibration of the ultrasonic test equipment fo*- use particularly requires that the time base. power and amplification be cietemlined according to bN tJ-2.
The time base is calibrated to a value at which the distance, on the oscalloscope screen, between the interface echo and back-wall echo is sufficient to allow a defect echo to be clearly detected between them
The power and amplification shall be calitwated on an area free from discontinuities. The amplitude of the first hack-wall echo is sel to the maxinlum screen height
The system shall be checked at least once every 8 h.
The procedure to be used shall also be in accordance with EN 583-2.
The characterisation curves shall be determined by using steeped reference blocks and shall give
a) the change in the amplitude of the hack-wall echo as a function of the product thickness
b) the change in the amplitude of the echo of the flat-bottomed hole as a function of its position for holes of diamntnr
11 mm for quality classes S1 S2 and E1
8 mm for quality classes S. S3. E2 and E3:
5 mm for quality classes S3 and E4.
When testing with a double-transducer probe only the 5 mm diameter hole is used for all the qualities as the characteristic curves corresponding to the 8 mm and 11 mm diameter holes become confused with the curve of the back-wall echo.
According to the family of stainless steel to be tested, the reference blocks with flat-bottomed holes of 11 mm, 8 mm and 5 mm diameter are made of austenitic or austenitic-ferritic stainless steel with a homogenous structure and close acoustic properties to the part to be examined and each curve shall be determined from at least five points distributed over the entire held ol use ot the probe
Thus, for a flat pioduct of yiveii thickness, the method consists of adjustiiiy the ampliLude of the back-wall echo to the value given by the curve for the variation of the back-wall echo amplitude and comparing the amplitude of the discontinuity ocho with the characteristics curves (for 11 mm. 8 mm and 5 mm diamoter holes) in accordance with tho quality class selected. Only discontinuitics for which the amplitude of the echo is greater than that of the characteristic curve shall be taker’ into account.BS/EN 10307-2001 pdf download.

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