SEAMLESS PRECISION STEEL TUBES
1. Standards
- EN10305-1
- DIN 2391 (has been replaced with EN 10305-1)
2. Used for
- In mechanical and automotive industries.
3. Dimensions
Precision steel tubes according DIN 2391 and EN 10305-1 in dimensional range corresponding to the workshop Cold rolling and drawing (Tab.1).
4. Tolerances
– Precision steel tubes according DIN 2391 and EN 10305-1 in dimensional range corresponding to the workshop Cold rolling and drawing (Tab.1).
– Precision steel tubes for skiving and roller burnishing according Tab.2.
5. Chemical Composition (%)
Steel Group | C | Si | Mn | P max | S max | V |
St35, E235 | max 0.17 | max 0.35 | min 0.40 | 0.025 | 0.025 | |
St45 | max 0.21 | max 0.35 | min 0.40 | 0.025 | 0.025 | |
St52, E355 | max 0.22 | max 0.55 | max 1.60 | 0.025 | 0.025 | |
E410, STE460 | 0.16÷0.22 | 0.10÷0.50 | 1.30÷1.70 | 0.030 | 0.035 | 0.08÷0.15 |
6. Mechanical Properties
Steel Group |
delivery cond. |
Tensile Strength | Yield Limit | Elongation |
N/mm² | N/mm² | % | ||
St35, E235 |
BK (+C) BKS(+SR) NBK (+N) |
min 480 min 420 340÷480 |
– min 350 min 235 |
min 6 min 16 min 25 |
St45 |
BK (+C) BKS(+SR) NBK (+N) |
min 580 min 520 440÷570 |
– min 375 min 255 |
min 5 min 12 min 21 |
St52, E355 |
BK (+C) BKS(+SR) NBK (+N) |
min 640 min 580 490÷630 |
– min 450 min 355 |
min 4 min 10 min 22 |
E410, STE460 | BKS +N |
min 690 550÷700 |
min 590 min 410 | min 12 min 22 |
7. Lengths
- Random lengths: 6÷9m or 8÷11m in length range corresponding to the workshop Cold rolling and drawing (Tab.1);
- Fixed lengths within the random lengths range;
- Tolerances: +100/-0 mm.
8. Protection
- Unprotected;
- If required, the tubes can be delivered with plastic caps at both ends;
- Oiled.
9. Marking
- The tubes will have technical details marked on tags attached to every bundle, according to standard or per customer request.
- Marking with inkjet on each pipe at customer request.
10. Delivery
Bundles up to 2000 kg.
Quantity tolerances: ±5% per size or / and per total.
11. Mill test report
- Mill test reports are issued to customer requirements. Usually they comply with EN 10204, type 3.1.