DIN2391 Seamless Steel Tube
DIN 2391 standard specifies the Seamless steel tubes used forMechanical and Automobile. The main products of steel / steel grade: DIN2391-1(ST35, ST45, ST52).
Carbon steel tubes for machine structural purposes.
Standard:
- DIN2391-1: Seamless Precision Steel Tube.
- EN 10305-1: Steel tubes for precision applications – Technical delivery conditions – Part 1: Seamless cold drawn tubes.
Size (mm):
- Outer Dimensions: 4.0mm – 60.0mm
- Wall Thickness: 0.5mm – 8 mm
- Length: max 6000mm
Application:motor-car construction, pneumatic and hydraulic operating mechanisms .
Steel grade:
- DIN2391-1 ST35
- DIN2391-1 ST45
- DIN2391-1 ST52
Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers requirements.
DIN2391-1: CHEMICAL COMPOSITIONS(%)
| Grade | C | Si | Mn | P | S |
| ST35 | ≤0.17 | ≤0.35 | ≥0.40 | ≤0.050 | ≤0.050 |
| ST45 | ≤0.21 | ≤0.35 | ≥0.40 | ≤0.050 | ≤0.050 |
| ST52 | ≤0.22 | ≤0.55 | ≥1.60 | ≤0.050 | ≤0.050 |
DIN2391-1: MECHANICAL PROPERTIES
| Grade | BK | BKW | BKS | ||||
| RmN/mmmin | min | RmN/mmmin | min | N/mmmin | ReHN/mmmin | min | |
| ST35 | 480 | 6 | 420 | 10 | 420 | 315 | 14 |
| ST45 | 580 | 5 | 520 | 8 | 520 | 375 | 12 |
| ST52 | 640 | 4 | 580 | 7 | 580 | 420 | 10 |
| Grade | GBK | NBK | |||
| N/mmmin | min | N/mmmin | ReHN/mmmin | min | |
| ST35 | 315 | 25 | 340-470 | 235 | 25 |
| ST45 | 390 | 21 | 440-570 | 235 | 21 |
| ST52 | 490 | 22 | 490-630 | 355 | 22 |
