SSID/DOM TUBE
DOM / SSID For Pneumatic Cylinders, Cold Drawn Welded Tube Steel
The cold drawn welded tube with an inner smooth and compressed surface can be utilised directly for hydraulic and pneumatic cylinder applications thanks to a specific drawing procedure ( ready-to-use). It is not necessary to hoe or burnish the surface.
The advantage of the SSID over the seamless tube is that it reduces wall thickness deviation and material expense.
- On SSID tubes with H8 tolerance, an Honing or Burnishing treatment can be used after SR.
- Eddy current and ultrasonic tests are used to validate the welded tubes.
- Eddy current testing was also used to validate hydraulic cylinders.
- The finished tubes are additionally subjected to UT and ET tests, as well as an Ultrasonic Test (EN10246-7) and an Eddy current test (EN 10246-3)
Detailed SSID Tube Specification
| Material: | Steel | Name: | Hydraulic Cylinder Tube |
|---|---|---|---|
| Specifications: | GB/T, DIN2391, EN10305-1 | Delivery Condition: | BKS / BK |
| Inside Honed Dia: | H8 | Length: | 5m - 5.8m |
| High Light: | honed tubing, honed cylinder tube | ||
Chemical Composition
| Steel Grade | 20# | 45# | 25Mn | 27SiMn | Q345B(ST52) | *Q345D(ST52) |
|---|---|---|---|---|---|---|
| C | 0.17-0.23 | 0.42-0.50 | 0.22-0.29 | 0.24-0.32 | 0.20 | 0.18 |
| Si | 0.17-0.37 | 0.17-0.37 | 0.17-0.37 | 1.10-1.40 | 0.55 | 0.55 |
| Mn | 0.35-0.65 | 0.50-0.80 | 0.70-1.00 | 1.10-1.40 | 1.00-1.60 | 1.00-1.60 |
| P | 0.035 | 0.025 | 0.03 | 0.035 | 0.04 | 0.03 |
| S | 0.035 | 0.02 | 0.03 | 0.035 | 0.04 | 0.03 |
| Cu | 0.25 | 0.20 | 0.20 | 0.30 | / | / |
| Ni | 0.30 | 0.25 | 0.25 | 0.30 | / | / |
| Cr | 0.25 | 0.25 | 0.25 | 0.30 | / | / |
| V | / | / | / | / | 0.02-0.15 | 0.02-0.15 |
| Nb | / | / | / | / | 0.015-0.06 | 0.015-0.06 |
| Ti | / | / | / | / | 0.02-0.20 | 0.02-0.20 |
| Al | / | / | / | / | / | 0.015 |
Mechanical property
| Supply Condition | Cold finished(Hard) - BK | Cold Drawn & Stress - relieved (BK+S) | Hardness align="center" height="30" HB | |||
|---|---|---|---|---|---|---|
| Steel Grade | Tensile Strength align="center" height="30" Mpa | Elongation(%) | Tensile Strength align="center" height="30" Mpa | Yield Strength align="center" height="30" Mpa | Elongation(%) | |
| 20# | ≧620 | ≧8 | ≧570 | ≧470 | ≧14 | 175 |
| 45# | ≧650 | ≧5 | ≧600 | ≧520 | ≧12 | 207 |
| ST52 | ≧640 | ≧5 | ≧600 | ≧520 | ≧15 | 190 |
| 25Mn | ≧640 | ≧5 | ≧600 | ≧510 | ≧15 | 195 |
| 27SiMn | ≧840 | ≧5 | ≧800 | ≧720 | ≧10 | 230 |
