Flanges Australia includes seamless precision tubes in our product range manufactured to DIN 2391 type C.
These tubes are supplied in a seamless cold drawn and normal annealed quality, marked by the code NBK. The tubes can be delivered in either grey phosphated & oiled finish or zinc passivated finish.
The tubes are manufactured from St37.4 carbon steel with a fine grained quality according to DIN 1630 and have the following material properties.
| Material | Tensile Strength Rm inN/mm2 | Yield Strength in N/mm2 | Elongation in % |
| ST37.4 according to DIN 1630 Material No 1.0255 finegrained quality | 350….480 | 235 for wall thickness less than or equal to 16mm | 25 |
Each tube is subjected to a non destructive material testing to detect faults and improperties.
Tubes are in fixed lengths of 6 metres and can be marked over the entire length according to DIN 2391.
This designation also serves as proof that the above mentioned tests have been carried out and replaces a test report according to EN10204 ( formerly DIN 50049 )
Please note that these certificates are batch released and must be requested at the time of ordering the tubes.
| Material | Tensile Strength Rm inN/mm2 | Yield Strength in N/mm2 | Elongation in % |
| X6 CrNiMoTi 17 12 2 Material No. 1.4571 Also Known as V4A
|
500….730 | 210 | 35 |
| X6 CrNiMoTi 18 10 Material No. 1.4541 Also known V2A
|
500….730 | 200 | 40 |
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**Calculated
Working
Theoretical
Burst
OD x
Wall
Pressure in Bar to
DIN2413
Pressure in Bar
6x1.0 374 1680
8x1.0 289 1190
10x1.0 249 870
10x1.5 358 1380
12x1.5 305 1150
12x2.0 393 1580
14x2.0 343 1340
15x1.5 249 980
16x2.0 305 1170
18x1.5 210 780
20x2.5 305 1220
22x2.0 228 850
25x2.5 249 920
25x3.0 294 1050
28x2.0 182 620
30x4.0 323 1250
35x2.5 182 620
38x4.0 261 970
42x3.0 182 580
** According to DIN 2413, Case 111:
dynamic load with operating temperature range
-40°C to +120°C