BKS, carbon steel tubes, din 2391, precision steel tube, Seamless tube, seamless tubes, steel tubes
DIN 2391 standard specifies theSeamless Precision Steel Tube used for Mechanical and Automobile.
Carbon steel tubes for machine structural purposes .
Standard:
Standard:
- DIN2391-1: Seamless Precision Steel Tube.
- EN 10305-1: Steel tubes for precision applications.
Size (mm):
- Outer Dimensions: 4.0mm-60.0mm
- Wall Thickness: 0.5mm-8 mm
- Length: max 6000mm
Application:
- motor-car construction
- pneumatic
- hydraulic operating mechanisms
Steel grade:
- DIN2391-1 ST35
- DIN2391-1 ST45
- DIN2391-1 ST52
Delivery Condition:
- GBK, BKS, BK, BKW, NBK
Inspection and Test:
- Chemical Composition, Mechanical Properties
- Visual and Dimension Test
- NDT
- Grain Size Test
Surface treatment:
- Oil-dip, Varnish, Shot Blasting
Packing:
- Inner packing:Caps on two ends of every pipe
- Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers' requirements .
- Surface treatment:Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.
- Marking: as per customers requirement
DIN2391-1: Chemical compositions(%)
| Grade | C | Si | Mn | P | S |
| DIN2391 ST35 | ≤0.17 | ≤0.35 | ≥0.40 | ≤0.050 | ≤0.050 |
| DIN2391 ST45 | ≤0.21 | ≤0.35 | ≥0.40 | ≤0.050 | ≤0.050 |
| DIN2391 ST52 | ≤0.22 | ≤0.55 | ≥1.60 | ≤0.050 | ≤0.050 |
DIN2391-1: Mechanical properties
| Grade | BK | BKW | BKS | GBK | NBK | |||||||
| Rm N/mm min | min | Rm N/mm min | min | N/ mm min | ReH N/mm min | min | N/ mm min | min | N/mm min | ReH N/mm min | min | |
| DIN2391 ST35 | 480 | 6 | 420 | 10 | 420 | 315 | 14 | 315 | 25 | 340-470 | 235 | 25 |
| DIN2391 ST45 | 580 | 5 | 520 | 8 | 520 | 375 | 12 | 390 | 21 | 440-570 | 235 | 21 |
| DIN2391 ST52 | 640 | 4 | 580 | 7 | 580 | 420 | 10 | 490 | 22 | 490-630 | 355 | 22 |
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