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DIN2391 Seamless Precision Steel Tube
DIN2391 is standard specification for seamless precision steel tube. Seamless precision steel tube will be used for Hydraulic and mechanical equipment. ST35,ST45, ST52 seamless precision steel tubes are main products in DIN2391
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Tianjin Wanlei Steel Pipe Co., Ltd. is one of the leading manufacturers and suppliers of din2391 seamless precision steel tube in China, featured by quality products and low price. If you're going to wholesale durable din2391 seamless precision steel tube made in China, welcome to get pricelist and free sample from our factory.
DIN2391 seamless precision steel tube
DIN 2391-2 standard specification for seamless precision steel tubes
Chemical composition of steel grades shown on ladle analysis
| Steel grade | Chemical composition, as a percentage by mass | ||||||||
| Symbol | Material Number | C, max | Si, max | Mn | P, max | S, max | Nb, max | Ti, max | V, max |
| St 30 Si | 1.0211 | 0.10 | 0.30 | ≤0.55 | 0.025 | 0.025 | 0.03 | 0.03 | 0.05 |
| St 30 Al | 1.0212 | 0.10 | 0.35 | ≤0.55 | 0.025 | 0.025 | 0.03 | 0.03 | 0.05 |
| St 35 | 1.0308 | 0.17 | 0.35 | ≥0.40 | 0.025 | 0.025 | 0.03 | 0.03 | 0.05 |
| St 45 | 1.0408 | 0.21 | 0.35 | ≥0.40 | 0.025 | 0.025 | 0.03 | 0.03 | 0.05 |
| St52 | 1.0580 | 0.22 | 0.55 | ≤1.60 | 0.025 | 0.025 | 0.03 | 0.03 | 0.05 |
Remark: Nb+Ti+V≤0.05%
Permitted deviations of the product analysis from the specified ladle analysis
| Element | permitted deviation from the specified limited of the ladle analysis, as a percentage by mass |
| C | +0.02 |
| Si | +0.03 |
| Mn | +0.06 or -0.06 |
| P | +0.005 |
| S | +0.005 |
| Nb | +0.01 |
| Ti | +0.01 |
| V | +0.05 |
Final supply condition of DIN 2391 seamless precision steel tube
| Designation | Symbol | Description |
| Cold finished (hard) | BK | Tubes don't undergo heat treatment following the final cold forming and, thus, have s 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 atomsphere. |
| Normalized | NBK | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
Mechanical properties of tubes at ambient temperature
| Steel grade | Cold finished (hard) (BK) | Cold finished(soft) (BKW) | Cold finished and stress-relieved (BKS) | Annealed (GBK) | Normalized (NBK) | ||||||||
| Material designation | Material number | Min. tensile strength, Rm, MPa | Min. elongation at fracture, A5, as a percentage | Min. tensile strength, Rm, MPa | Min. elongation at fracture, A5, as a percentage | Min. tensile strength, Rm, MPa | Min. yield strength, ReH, MPa | Min. elongation at fracture, A5, as a percentage | Min. tensile strength, Rm, MPa | Min. elongation at fracture, A5, as a percentage | Tensile strength, Rm, MPa | Min. yield strength, ReH, MPa | Min. elongation at fracture, A5, as a percentage |
| St 30 Si | 1.0211 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290-420 | 215 | 30 |
| St 30 Al | 1.0212 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290-420 | 215 | 30 |
| ST 35 | 1.0308 | 480 | 6 | 420 | 10 | 420 | 315 | 14 | 315 | 25 | 340-470 | 235 | 25 |
| ST 45 | 1.0408 | 580 | 5 | 520 | 8 | 520 | 375 | 12 | 390 | 21 | 440-570 | 255 | 21 |
| ST 52 | 1.0580 | 640 | 4 | 580 | 7 | 580 | 420 | 10 | 490 | 22 | 490-630 | 355 | 22 |
Seamless precision steel tubes are mainly used where accuracy to size and, possibly, a small wall thickness, a particular surface condition and specific mechanical propertiesare required.
NBK surface of DIN 2391 seamless precision steel tube
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