EN 10305-1 E355 Hydraulic Cylinder Pipe,Round Honed Steel Tube,EN 10305-1 E355 seamless tubes
EN 10305-1 E215/E235/E355 Seamless tube
EN 10305 – 1 Steel tubes for precision applications – Technical delivery conditions – Part 1: Seamless cold drawn tubes
This Part of EN 10305 specifies the technical delivery conditions for seamless cold drawn steel tubes of circular cross section for precision applications.
Tubes according to this Part of EN 10305 are characterized by having precisely defined tolerances on dimensions and a specified surface roughness. Typical fields of application are in the vehicle, furniture and general engineering industries.
Honing is a kind of machining technology. Through honing head, the inner hole of cold drawn pipe is processed by reciprocating high-speed grinding technology, so that the inner hole can meet the requirements of tolerance size and surface roughness that we need.
Honed tube is a kind of smooth bore steel tube used to manufacture hydraulic cylinder barrels that is the core part of a piece of hydraulic cylinder.
Size range: 40mm*30mm-580mm*500mm
Available steel grade:
| SAE/AISI: | SAE1020, SAE1026, SAE1045, SAE4130, SAE4140 |
| DIN: | ST52, ST52.3, ST52.4 |
| EN: | E355, C45E, 25CrMo4, 42CrMo4, CK45, S45C, E410, E470 |
| GB: | 20#, 45#, 16Mn, Q345B, Q345C, Q345D, Q345E, 25Mn, 27SiMn, |
Manufacture method: Cold rolled, hydraulic cold drawn, hot rolled+deep hole boring
Delivery condition:
| BK | BKW | BKS | GBK | NBK | Q+T |
| +C | +LC | +SR | +A | +N | |
| Cold rolled | Cold drawn | Stress relieved | Annealed | Normalized | Quenched+Tempered |
Bore treatment: Honing, skiving&roller burnishing
Bore roughness control: Ra0.25um max or Ra0, 35um max for honed tubes, Ra0.25um max for skived&roller burnished tubes.
End finish: Plain ends with square cuts, free of burrs for honed tubes. Little bevelled ends for skived&roller burnished tubes.
Standard export packing: In bundles tied with steel strips. Internal & external oil coating. Plastic caps on both ends. External packing by PVC bags and knit bags.
Customized packing and marking can be provided upon request.
H8 tolerance:
| ID range | Tolerance | ID range | Tolerance |
| 18< d ≤30 | +0/+0.033 | 180< d ≤250 | +0/+0.072 |
| 30< d ≤50 | +0/+0.039 | 250< d ≤300 | +0/+0.081 |
| 50< d ≤80 | +0/+0.046 | 300< d ≤315 | +0/+0.081 |
| 80< d ≤120 | +0/+0.054 | 315< d ≤400 | +0/+0.089 |
| 120< d ≤180 | +0/+0.063 | 400< d ≤500 | +0/+0.097 |
Difference between honed tube and skived & roller burnished tube: In hydraulic cylinder industry, there are 2 solutions for bore treatment: Honing, and skiving&roller burnishing. Honing or skiving&roller burnishing leads to different internal surface image, but both ensure good roughness.
| Chemical composition (cast analysis)a | |||||||
| Steel name | Steel number | C | Si | Mn | P | S b | Al |
| max. | max. | max. | max. | max. | min. | ||
| E215 | 1.0212 | 0.10 | 0.05 | 0.70 | 0.03 | 0.03 | 0.025 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.03 | 0.03 | – |
| E355 c | 1.0580 | 0.22 | 0.55 | 1.60 | 0.03 | 0.03 | – |
b See option 2
c Addition of Nb, Ti and V are permitted at the discretion of the manufucturer. The content of these elements shall be reports.
Option 2: For the steel grades E235 and E355 a controlled sulphur content of 0.015 % to 0.040 % is specified to
support machinability. It shall be obtained by resulphurising the steel after maximum desulphurisation or alternatively by using a low oxygen process.
Mechanical properties at room temperature
| Steel grade | Minimum values for the delivery condition a,b | ||||||||||||
| Steel name | Steel number | +C c | +LC c | +SR | +A d | +N | |||||||
| Rm Mpa | A % | Rm Mpa | A % | Rm Mpa | ReH Mpa | A % | Rm Mpa | A % | Rm Mpa | ReH e Mpa | A % | ||
| E215 | 1.0212 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290 to 430 | 215 | 30 |
| E235 | 1.0308 | 480 | 6 | 420 | 10 | 420 | 350 | 16 | 315 | 25 | 340 to 480 | 235 | 25 |
| E355 | 1.0580 | 640 | 4 | 580 | 7 | 580 | 450 f | 10 | 450 | 22 | 490 to 630 | 355 | 22 |
a Rm: tensile strength ; ReH: upper yield strength; A: elongation after fracture.
b 1 MPa = 1 N/mm2.
c Depending on the degree of cold work in the finishing pass the yield strength may nearly be as high as the tensile strength. For calculation purposes the following relationships are recommended:
– for delivery condition +C: ReH ≥ 0.8 Rm;
– for delivery condition +LC: ReH ≥ 0.7 Rm.
d For calculation purposes the following relationship is recommended: ReH ≥ 0.5 Rm.
e For tubes with outside diameter ≤ 30 mm and wall thickness ≤ 3 mm the ReH minimum values are 10 MPa lower than the values given in this Table.
f For tubes with outside diameter > 160 mm: ReH ≥ 420 MPa.
