|
Class |
Unacceptable individual discontinuity mm2 |
Acceptable clusters of discontinuities |
||
|
Area a> considered mm |
Maximum density not greater than |
|||
|
So |
S > 5 000 |
1 000 < S < 5 000 |
20 in the most populated |
|
|
|
|
|
1 m x 1 m square |
|
|
Si |
S > 1 000 |
100 < S< 1 000 |
15 in the most populated |
|
|
|
|
|
1 m x 1 m square |
|
|
S2 |
S > 100 |
50 < S < 100 |
10 in the most populated |
|
|
|
|
|
1 m x 1 m square |
|
|
S3 |
S> 50 |
20 < S < 50 |
10 in the most populated |
|
|
|
|
|
1 m x 1 m square |
|
|
a) Area of each discontinuity in the cluster in question (see 9.2). |
|
|||
|
NOTE This table can be used for thicknesses > 60 mm if an appropriate method other than the 6 dB |
||||
|
method is used for the sizing of discontinuities. |
|
|||
Table 4 : Acceptance criteria for testing with normal probes for the body of flat products
|
Class |
Unacceptable individual discontinuity |
Acceptable clusters of discontinuities |
||||||
|
Dimensions a> (number) considered |
Maximum number not greater than |
|||||||
|
So |
S > 5 000 mm2 |
1 000 < S < 5 000 mm2 |
20 in 1 m x 1 |
the most m square |
populated |
|||
|
S! |
S > 1 000 mm2 |
100<S< 1 000 mm2 |
15 in 1 m x 1 |
the most m square |
populated |
|||
|
S2 |
Discontinuities where the flaw echo has an amplitude greater than the characteristic curve 0 11 mm |
n2 (between 0 8 mm and 0 11 mm) |
10 in 1 m x 1 |
the most m square |
populated |
|||
|
S3 |
Discontinuities where the flaw echo has an amplitude greater than the characteristic curve 0 8 mm |
N3 (between 0 5 mm and 0 8 mm) |
10 in 1 m x 1 |
the most m square |
populated |
|||
|
a) Dimensions of each discontinuity in the cluster in question (see 9.2). |
||||||||
Table 5 - Acceptance criteria for flat product edge zone testing
|
Class |
Permissible individual discontinuity size |
Minimum discontinuity dimension considered Lmin mm |
Permissible number of discontinuities smaller than the maximum area Smax and longer than Lmin per 1 m length |
|
|
Maximum Dimension Emax mm |
Maximum Area Smax mm |
|||
|
Eo |
100 |
2 000 |
50 |
6 |
|
Ei |
50 |
1 000 |
25 |
5 |
|
e2 |
40 |
500 |
20 |
4 |
|
E3 |
30 |
100 |
15 |
3 |
|
Ед |
20 |
50 |
10 |
2 |
NOTE For product with thickness > 60 mm, a counting of the discontinuities is carried out using the characteristics curves for the 11 mm, 8 mm and 5 mm diameters holes :
Ез number of discontinuities giving echos with an amplitude between characteristic curves for the 8 mm and 11 mm diameter holes : 3 ;
Ед number of discontinuities giving echos with an amplitude between characteristic curves for the 5 mm and 8 mm diameter holes : 2.
Key :
See table 2 for the value of the edge zone width
Scan line
Edge zone
Principal rolling direction
Flat product
Width
Length
Figure 1 - Schematic representation of terms used
Annex A
(informative)
List of equivalent terms in several european languages
Table A.1
|
English |
French |
German |
Italian |
Dutch |
|
Time base |
Base de temps |
Zeitablenkung |
Base dei tempi |
Tijdbasis |
|
Noise signal |
Bruit de fond |
Rauschanzeige |
Rumore di fondo |
Ruis |
|
Discontinuity echo |
Echo d'anomalie |
Fehlerecho |
Eco del difetto |
Indicatie-echo |
|
Back echo |
Echo de fond |
Ruckwandecho |
Eco di fondo |
Bodemecho |
|
Probe |
Traducteur |
Prufkopf |
Sonda |
Taster |
|
Double transducer probe |
Traducteur emetteur et recepteur separes |
SE-Prijfkopf |
Sonda ed emettitore e ricevitore separati (sonda doppia) |
Dubbel-kristaltaster |
|
Single probe |
Traducteur normal |
Einschwinger- Prufkopf |
Sonda normale |
Rechtetaster |
|
Transducer |
Transducteur |
Schwinger |
Transduttore |
Kristal |
|
Flat bottomed hole |
Trou a fond plat |
Flachbodenbohrung |
Foro a fondo piatto |
Vlakbodemgat |
|
Dead zone |
Zone morte |
Tote Zone |
Zona morta |
Dode zone |
