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EN10305-1 E235 E355 +SRA +N Cold Drawn Seamless Precision Steel
Tube for Precision Application
Tubes according to this standard EN10305-1are characterized by
having precisely defined tolerances on dimensions and a specified
surface rougghness. Typical fields of application are in the
vehicle, furniture and general engineering industrues.
The steelmaking process is at the discretion of the manufacturer.
Steels shall be fully killed.
Typical fields of application are in:
Automobile and motorcycle Shock Absorber Pipe
Hydraulic-cylinder Pipe
Mechanical steel pipes for auto and motor parts
Gas Spring pipe
motor casing pipe etc
Delivery Conditions:
| Designation | Symbol | Description |
| Cold drawn/hard | +C | No heat treatment after the final cold drawing process |
| Cold drawn/soft | +LC | After the final heat treatment there is a suitable drawing pass |
| Cold drawn and stress releived | +SR | After the final cold drawing process there is a stress relief heat treatment in a controlled atmosphere |
| Annealed | +A | After the final cold drawing process the tubes are annealed in a controlled atmosphere |
| Normalized | +N | After the final cold drawing operation the tubes are normalized in a controlled atmosphere |
Chemical Compositions:
| Steel Grade | C max | Si max | Mn max | P max | S max | Al min | |
| Steel Name | Steel Number | ||||||
| E215 | 1.0212 | 0.10 | 0.05 | 0.70 | 0.025 | 0.025 | 0.025 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.025 | 0.025 | - |
| E355 | 1.0580 | 0.22 | 0.55 | 1.60 | 0.025 | 0.025 | - |
Permissible deviations of the product analysis from the specified
limits
| Element | Limiting values for cast analysis | Permissible deviatioon of the product analysis in % by mass |
| C | ≤0.22 | +0.02 |
| Si | ≤0.55 | +0.05 |
| Mn | ≤1.60 | +0.10 |
| P | ≤0.025 | +0.005 |
| S | ≤0.015 | +0.003 |
| Al | ≥0.025 | -0.005 |
