EN10305-1 E235 E355 Seamless Cold Drawn Steel Tube Automotive Precision Tube
EN10305-1 E235 Carbon Steel Seamless Cold Drawn Tube Bright Annealed Precision Tube
EN10216 seamless precision tubes made of carbon steel like E235, E255, and E355 are frequently used in automotive industry due to their excellent mechanical properties, such as high strength and good formability. The economic advantage of using these precision tubes lies in their cost-effectiveness compared to other materials while still meeting the required quality and performance standards.
EN10305 Carbon Steel Tube Chemical Properties
| Pipe types | CHEMICAL COMPOSITION (LADLE ANALYSIS) | ||||||||||
| C% | Si% | Mn% | P% | S% | Cr% | Mo% | V% | Inne% | Cr+ Mo+ Ni Max% | Al.% | |
| E235 | <=0,17 | <=0,35 | <=1,20 | <=0,025 | <=0,025 | - | - | - | - | - | 0,020- 0,060 |
| E255 | <=0,21 | <=0,35 | 0,40-1,10 | <=0,025 | <=0,025 | - | - | - | - | - | 0,020- 0,060 |
| E355 | <=0,22 | <=0,55 | <=1,60 | <=0,025 | <=0,025 | - | - | - | - | - | 0,020- 0,060 |
EN10305 Carbon Steel Tube Mechanical Properties
| Mechanical properties at room temperature | |||||||||||||
| Steel Grade | Minimum values for the delivery condition | ||||||||||||
| Steel Name | Steel Number | +C | +LC | +SR | +A | +N | |||||||
| Rm | A | Rm | A | Rm | ReH | A | Rm | A | Rm | ReH | A | ||
| Mpa | % | Mpa | % | Mpa | Mpa | % | Mpa | % | Mpa | Mpa | % | ||
| E215 | 1.0212 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290 to 430 | 25 | 30 |
| E235 | 1.0308 | 480 | 6 | 420 | 10 | 420 | 350 | 16 | 315 | 25 | 340 to 480 | 235 | 25 |
| E355 | 1.058 | 640 | 4 | 580 | 7 | 580 | 450 | 10 | 450 | 22 | 490 to 630 | 355 | 22 |
EN10305 Carbon Steel Tube Resistance Properties
| Pipe types | Steel grades | Resistance properties | |||||||||||
| +C | +LC | +SR | +A | +N | |||||||||
| Rm [MPa] | A% | Rm [MPa] | A% | Rm [MPa] | Re [MPa] | A% | Rm [MPa] | A% | Rm [MPa] | Re [MPa] | A% | ||
| Precision | E235 | 480 | 6 | 420 | 10 | 420 | 350 | 16 | 315 | 25 | 340- 480 | 235 | 25 |
| E235, | E255 | 580 | 5 | 520 | 8 | 520 | 375 | 12 | 390 | 21 | 440- 570 | 255 | 21 |
| E255, | E355 | 640 | 4 | 580 | 7 | 580 | 450 | 10 | 450 | 22 | 490- 630 | 355 | 22 |
| E355 | C34E | 590 | 5 | 540 | 7 | - | - | - | 440 | 22 | >= 460 | 280 | 21 |
| According to PN-EN 10305-1 | C45E | 720 | 4 | 670 | 6 | - | - | - | 510 | 20 | >= 540 | 340 | 18 |
EN10305-4 E235N Carbon Steel Seamless Tube
The "N" in E235 N stands for normalized, which means the steel has been heat-treated to improve its mechanical properties.
This type of tube has a high dimensional accuracy and a smooth surface finish, which makes it suitable for applications where tight tolerances and a clean appearance are important.
Seamless precision tubes are used for the following applications
- Heat exchangers
- Elevator tubes
- Gas bottles
- Pit props
- HPL tubes (with phosphated, alternatively galvanised surface)
- Hawse pipes
- Motorbike/bicycle frames
- Rivets
- Pump pipes
- Textile machine construction
- Cylindrical pipes, piston pipes, telescopic pipes
- Stabiliser pipes
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