SSID / DOM Cold Drawn Welded Tube Steel For Pneumatic Cylinders
SSID/DOM TUBE
Detailed Product Description
With the aid of a special drawing technique, the cold drawn welded
tube with a inside smooth and
compressed surface can directly used for the hydraulic and
pneumatic cylinder application ( ready-to-use). The hoing or
burnishing is not required. Compared to the seamless tube, the
advantage of
the SSID reduce the wall thickness deviation and the material cost.
Specification:
EN10305-2 , DIN 2393, ASTM A513 Type 6
ID tolerance: H9
ID roughness: Ra ≤ 0.80u
Concentricity < 3%
Delivery status: BK or BKS
Honing or Burnishing process can be provided after SR on SSID tubes
with H8 tolerance.
The welded tubes were approved by eddy current testing and
ultrasonic testing.
Hydraulic cylinders were also approved by eddy current test.
Finished tubes are also tested by UT and ET,
Ultrasonic Test (EN10246-7),Eddy current test(EN 10246-3)
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 HB |
| Steel Grade | Tensile Strength Mpa | Elongation(%)
| Tensile Strength Mpa | Yield Strength 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 |
Hydraulic Cylinder Tube
1. Specification
GB/T, DIN2391, EN10305-1
2. Delivery Condition
Stress Relieving Annealed a ( +SR, BKS)
As per the request, + N (NBK) or + C ( BK) is available.
3. Outer Diameter
< 40 mm +/-0.2mm
From 40 to 100 mm +/-0.3mm
>100mm +/-0.5mm
4. Wall Thickness
<100mm OD +/-5%
>100mm +/-7.5%
5. Straightness 0.5/1000mm
6. Inside Honed Dia ISO H8
7. Rourghness Ra 0.2~0.4um
8. Length 5.0-5.8m
9. Fix length tolerance
Length<500 +3mm
500< length <=2000 +5mm
2000<length <5000 +10mm
5000<length<7000 +20mm
10. Stencilling Mark
Mill Logo + Specification + Delivery Condition + Steel Grade + Size
+ Heat Number
11. Tube Ends
Tube ends shall cut square to the tube axis and be free from
excessive burrs.
Both ends protected with Plastic caps.
As the result of stress relieved annealing after the final drawing,
residual stresses are reduced, forming within defined limits is
made possible, and dimensional changes during/after machining are
minimized.
