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Standard EN 10305 covers steel precision tubes. The standard includes delivery conditions for six different parts. Part 1 or EN 10305-1 refers to seamless cold drawn precision tubes. These precision tubes are specially marked with the letter E, so they are manufactured to standards and hold tight tolerances, making them ideal for use as machine parts. This is because the precision steel tube en 10305-1 is the same as the system to be connected.
EN10305-1, E235+N seamless pipe
EN 10305 is suitable for seamless precision steel tube
applications.
Power Steering Applications
The EN 10305 European Standard specifies the technical delivery
conditions for seamless cold-drawn pipes of circular cross-section
for hydraulic and pneumatic systems.
Standard and Steel Grades:
EN10305-1 E215
EN10305-1 E235
EN10305-1 E355
The allowable pressure rates and temperatures are the
responsibility of the customer according to the safety factors
specified in the latest technical and application regulations,
codes or standards.
Pipes complying with this EN 10305 European standard are characterized by precisely defined dimensional tolerances and specified surface roughness.
EN 10305 Seamless precision tubes shall be cold drawn from hot worked seamless tubes. Other suitable cold working methods are permitted. The tube shall be delivered in delivery condition +N, which means that after the final cold drawing operation, the tube is normalized in a controlled atmosphere.
NBK refers to protective heat treatment in a non-oxidizing environment to make the surface of the pipe bright and smooth.
| 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, E255, E355 According to PN-EN 10305-1 | E235 | 480 | 6 | 420 | 10 | 420 | 350 | 16 | 315 | 25 | 340- 480 | 235 | 25 |
| E255 | 580 | 5 | 520 | 8 | 520 | 375 | 12 | 390 | 21 | 440- 570 | 255 | 21 | |
| E355 | 640 | 4 | 580 | 7 | 580 | 450 | 10 | 450 | 22 | 490- 630 | 355 | 22 | |
| C34E | 590 | 5 | 540 | 7 | - | - | - | 440 | 22 | >= 460 | 280 | 21 | |
| C45E | 720 | 4 | 670 | 6 | - | - | - | 510 | 20 | >= 540 | 340 | 18 | |
| 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 |
| C35E | 0,32-0,39 | <=0,40 | 0,50-0,80 | 0,035 | <=0,035 | <=0,40 | <=0,10 | - | - | 0,63 | - |
| C45E | 0,42-0,55 | <=0,40 | 0,50-0,80 | 0,035 | <=0,035 | <=0,40 | <=0,10 | - | - | 0,63 | -
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| Yield Strength | Tensile Strength | Elongation A5 min | |||
| MPa min | ksi min | MPa min | MPa min | ksi min | Percentage |
| 490 | 630 | – | 22 | ||
| DIN | EN | BS | NFA | ASTM | ASME |
| – | EN 10305-1 Grade E355 | – | – | – | – |
| Mandatory | Chemical analysis | M | M |
| Tensile testing | M | One per tested batch | |
| Dimension verification | M | M | |
| Visual inspection | M | M | |
| Optional | Flattening test or expansion test (option 20) | M | One per tested batch |
| Roughness measurement | Not applicable | One per tested batch | |
| NDT in order to identify longitudinal discontinuity | Not applicable | Individual | |
| NDT in order to identify leaks |
