HYDRAULIC CYLINDER TUBE
precision cold drawn/ cold rolled seamless steel tubes and skived & roller burnished tubes for all kinds of hydraulic cylinders, covering construction machinery, agriculture machinery, mining machinery, material handling machinery, aerial working platform, lifting platform, vehicle, hydraulic jack and etc.
Size Range
Cold Drawn Tube: I.D φ 16-220mm, WT 2-32mm
Cold Rolled Tube: I.D φ 16-82mm, WT 3.2-32mm
SRB Tube: I.D φ 50-250mm, WT 3-32mm
Executive Standard
GB/T3639, Cold-drawn or cold-rolled precision seamless steel
GB/T1591, High strength low alloy structural steels
DIN2391, Seamless precision steel tubes
DIN2393, Welded Precision Steel Tubes
EN10305-1, Steel tubes for precision applications Part 1: Seamless cold drawn tubes
EN10305-2, Cold drawn steel tubes for precision applications Part 2: Welded cold drawn tubes
ASTM A519, Seamless Carbon and Alloy Steel Mechanical Tubing
ASTM A513, Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing
According to customer’s specific requirements
Steel Grade
20#, 45#, 25Mn, Q355B, Q345D ； ST45, ST52 ； E255, E355 ； 1020, 1026, 1045 and etc.
Delivery Condition
Cold drawn/hard (+C) (BK)
Cold drawn and stress relieved (+SR) (BKS)
Hydraulic Cylinder Tube Size
| Processing Type | ID（mm） | Length（mm） | Straightness（mm） | tolerance（mm） | Roughness（μm） |
| Cold Drawn | 16-220 | ≤12 | 0.2-0.5/1000 | As per request | 0.8-1.6 |
| Cold Rolled | 16-82 | ≤12 | 0.2-0.5/1000 | ≤0.8 | |
| Skived and Roller Burnished | 50-250 | ≤6 | 0.2-0.3/1000 | H8-H9 | ≤0.4 |
Chemical Composition
| Steel Grade | C | Si | Mn | P | S | Cr | Ni | Cu | V | Al |
| 20# | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.30 | ≤0.25 | ||
| 45# | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.30 | ≤0.25 | ||
| Q355B | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.035 | ≤0.30 | ≤0.50 | ≤0.30 | ≤0.15 | |
| Q345D | ≤0.18 | ≤0.50 | ≤1.70 | ≤0.030 | ≤0.025 | ≤0.30 | ≤0.50 | ≤0.30 | ≤0.15 | ≥0.015 |
| 25Mn | 0.22-0.29 | 0.17-0.37 | 0.70-1.0 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.30 | ≤0.25 | ||
| 1026 | 0.22-0.28 | 0.15-0.35 | 0.60-0.90 | ≤0.040 | ≤0.050 | |||||
| ST45 | ≤0.21 | ≤0.35 | ≥0.4 | ≤0.025 | ≤0.025 | |||||
| E255 | ≤0.21 | ≤0.35 | 0.40-1.10 | ≤0.025 | ≤0.025 | |||||
| E355 (ST52) | ≤0.22 | ≤0.55 | ≤1.6 | ≤0.025 | ≤0.025 | ≥0.02 |
Mechanical Properties
| Delivery Condition | Cold Finished Hard (+C/ BK) | Cold Finished and Stress Relieved (+SR/ BKS) | ||||
| Steel Grade | Tensile Strength (Mpa) | Elongation (%) | Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) | Impact Value (-20℃) |
| 20# / 1020 / E255 / ST45 | ≥580 | ≥8 | ≥580 | ≥480 | ≥15 | - |
| 45# / 1045 | ≥680 | ≥5 | ≥630 | ≥520 | ≥12 | - |
| Q355B | ≥660 | ≥8 | ≥620 | ≥520 | ≥15 | - |
| Q345D | ≥660 | ≥8 | ≥620 | ≥520 | ≥15 | ≥27 |
| 25Mn (1026) | ≥640 | ≥8 | ≥620 | ≥510 | ≥15 | - |
| E355 (ST52) | ≥680 | ≥8 | ≥650 | ≥580 | ≥15 | ≥27 |
Application:
