DIN2391 Seamless Precision Steel Tubes
DIN2391 Precision steel Tubes is a kind of high-precision steel pipe material after cold drawing or cold rolling.
It is mainly used as a pipe or structural part and honed tubes.
When you choose our DIN2391 Seamless Precision Steel Tubes, you’re investing in quality, efficiency, and a product that stands the test of time.
Haotan offers the perfect solution all kinds of tubes.
DIN2391 Tube Specifications
• Procedure: SMLS
• Dimensions: 10.3mm – 165mm
• Thickness: 1.0mm – 25mm
• Unit Length: 1 – 12 metres
• Steel Grade: St 30 Si，St 30Al, St 35, St 45, St 52
• End Shape: Beveled end, plain end, vanished, or adding plastic caps, as per customer's requirements
• Pipe Packing: In bundles, Plastic film full length wrap
Supply Condition:
• BK (+C) No heat treatment after last cold forming process.
• BKW (+LC) After last heat treatment there is a light finishing pass (cold drawing)
• BKS (+SR) After the final cold forming process the tubes are stress relieve annealed.
• GBK (+A) After the final cold forming process the tubes are annealed in a controlled atmosphere.
• NBK (+N) After the final cold forming process the tubes are annealed above the upper transformation point in acontrolled atmosphere.
Mechanical Property
| Steel Grade | Mechanical Performance | |||||
| GBK(+A) | NBK(+N) | |||||
| Tensile | Elongation | Tensile | Yield | Elongation | ||
| Strength | rate | rate | Strength | Strength | rate | |
| (Rm mpa) | (A5 %) | (A5 %) | (Rm mpa) | (Reh mpa) | (A5 %) | |
| St30 Si | ≥280 | ≥30 | ≥30 | 290-420 | ≥215 | ≥25 |
| St35 Al | ≥280 | ≥30 | ≥30 | 290-420 | ≥215 | ≥25 |
| St35 | ≥315 | ≥25 | ≥25 | 340-470 | ≥235 | ≥25 |
| St45 | ≥390 | ≥21 | ≥21 | 440-570 | ≥255 | ≥21 |
| St52 | ≥490 | ≥22 | ≥22 | 490-630 | ≥355 | ≥22 |
Chemical Composition
| Steel Grade | Chemical Composition, as a percentage by mass | |||||
| Symbol | Material No | C | Si | Mn | P | S |
| Max. | Max. | Max. | Max. | |||
| St30 Si | 0.1 | 0.3 | ≤0.55 | 0.025 | 0.025 | |
| St35 Al | 0.1 | 0.05 | ≤0.55 | 0.025 | 0.025 | |
| 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 | 0.35 | ≤1.60 | 0.025 | 0.025 | |
Advantages of haotan tube
• Precise custom outer diameter and inner diameter
• Tight tolerances, resulting in reduced machine time / Dimensional accuracy
• Smooth and Clean OD and ID surfaces
• Excellent machining characteristics
• Wider range of physical properties attainable through process and annealing options
