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Specifications
DIn2391 St45 Honed Hydraulic tubes1.Fast delivery
2.Non-standard sizes and made-to-order
3.Small min o
DIn2391 St45 Honed Hydraulic tubes
Seamless precision steel tubes are used variously:
• equipment engineering
• elevator tubes
• gas cylinders
• pit props
• hydraulic lines
• chain pipes
• bicycle/ motorcycle frames
• rivets
• pumps
• technical machinery
• cylinder, piston and telescopic tubes
• stabiliser tubes
• gear box tubes
• drive shaft tubes
Tubes for automotive industry:
• axles for gearboxes
• fuel injection lines
• piston bolts
• ball cages
• steering wheel shafts column tubes
• power-assisted steering tubes
DIN 2391-1: Seamless precision steel tubes
This standard specifies dimensions for cold finished, seamless precision steel tubes. The preferred sizes listed are mainly used in mechanical and automotive engineering.
| Steel Grade | Chemical Composition(%) | ||||
| C max | Si max | Mn | P max | S max | |
| St35 | 0.17 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| St45 | 0.21 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| St52 | 0.22 | 0.55 | ≥0.40 | 0.025 | 0.025 |
Mechanical properties
|
Steel grade |
BK | BKW | BKS | GBK | NBK | |||||||
|
Tensile Strength Rm N/mm min |
Eloga-tion A % min |
Tensile Strength Rm N/mm min |
Eloga-tion A % min |
Tensile Strength Rm N/mm min |
Yield Strength ReH N/mm min |
Eloga-tion A % min |
Tensile Strength Rm N/mm min |
Eloga-tion A % min |
Tensile Strength Rm N/mm min |
Yield Strength ReH N/mm min |
Eloga-tion A % min |
|
| St35 | 480 | 6 | 420 | 10 | 420 | 315 | 14 | 315 | 25 | 340-470 | 235 | 25 |
| St45 | 580 | 5 | 520 | 8 | 520 | 375 | 12 | 390 | 21 | 440-570 | 235 | 21 |
| St52 | 640 | 4 | 580 | 7 | 580 | 420 | 10 | 490 | 22 | 490-630 | 355 | 22 |
Designation |
Symbol |
Description |
Cold finished (hard) |
BK |
Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation. |
Cold finished (soft) |
BKW |
The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming. (e.g. bending, expanding). |
Cold finished and stress-relieved |
BKS |
Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
Annealed |
GBK |
The last cold forming process is followed by annealing in a controlled atmosphere. |
Normalized |
NBK |
The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
- Mill test certificates will be issued according to EN10204/3.1B
- Packing: Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.
- Inspection and Test: Chemical Composition Inspection, Mechanical Properties Test(Tensile Strength,Yield Strength, Elongation, Flaring, Flattening, Bending, Hardness, Impact Test), Surface and Dimension Test, No-destructive Test, Hydrostatic Test.
- Surface treatment: Oiled, black painted, hot dipped galvanized or phosphate coating as required.
- Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.
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