EN 10297 Seamless circular steel tubes for mechanical and general engineering purposes. Technical delivery conditions. Non-alloy and alloy steel tubes.
Standard: BS EN 10297-1:2003
Standard: BS EN 10297-1:2003
Applications of EN10297:
Alloy and non-alloy steel pipes, with circular section for mechanical and engineering applications.
Process: Seamless
Tolerance and size range :
Outside diameter:
D<=219.1mm: +/-1%(Min+/-0.5mm)
D>219.1mm:+/-1%
D<=219.1mm: +/-1%(Min+/-0.5mm)
D>219.1mm:+/-1%
Thickness:
D<=219.1mm:+/-12.5%(min +/-0.4mm)
D>219.1mm: itchanges according to the ratio thickness/ diameter
D<=219.1mm:+/-12.5%(min +/-0.4mm)
D>219.1mm: itchanges according to the ratio thickness/ diameter
Tolerance on thickness related to t/CD:
| <=0.025 | 0.025<T<=0.050 | >0.050 |
| +/- 20% | +/-15% | +/-12.5% |
Size range: According to DIN_EN_10220-2003 unless differently spcified by the customer
Straightness
D<33.7mm :not specified
D>=33.7mm :0.15% on the total length
D>=33.7mm :0.15% on the total length
Note:
D: Outside diameter
T: Nominal thickness (mm)
T: Nominal thickness (mm)
Out of proundness
Included in the outside diameter tolerance
Standard and Steel grade:
- EN 10297 E235
- EN 10297 E355
- EN 10297 C35E
- 20MnV6
Certification: UNI EN10204.3.1
Chemical analysis [%] of EN 10297:
| Steel grade | C | Si | Mn | P | S |
| E235 | ≤0,17 | ≤0,35 | ≤1,20 | ≤0,040 | ≤0,045 |
| E355 | ≤0,22 | ≤0,55 | ≤1,60 | ≤0,040 | ≤0,045 |
| C35E | 0,32 – 0,39 | ≤0,40 | 0,50 – 0,80 | ≤0,035 | ≤0,035 |
| 20MnV6 | 0,16 – 0,22 | 0,10 – 0,50 | 1,30 – 1,70 | ≤0,035 | ≤0,040 |
Mechanical properties of EN 10297:
| Steel grade | Supply condtion | ReH min [MPa] | Rm min [MPa] | A [%] | ||
| T≤16 | 16<T≤25 | T≤16 | 16<T≤25 | |||
| E235 | AR | 235 | 225 | 360 | 360 | 25 |
| E355 | AR | 355 | 345 | 490 | 490 | 20 |
| C35E | N | 300 | 280 | 520 | 500 | 17 |
| 20MnV6 | AR | 470 | 450 | 650 | 620 | 17 |
Condition on delivery:
| Term | Symbol | Explanation |
| Cold-finished/hard (cold-finished as-drawn) | BK | No heat treatment after the last cold-forming process. The tubes therefore have only low deformability. |
| Cold-finished/soft (lightly cold-worked) | BKW | After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits. |
| Annealed | GBK | After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum. |
| Normalized | NBK | The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum. |
