North Steel manufactures a variety of 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.
Hydraulic Cylinder Tube
Seamless hydraulic tubing is produced as a seamless tube by rolling and piercing bar stock. It then gets multiple cold-drawing reductions before a final cold draw guarantees tight dimensional tolerances and excellent surface finish. After final sizing of the tube through cold drawing it undergoes intermediate annealing and a dead-soft annealing process to meet requirements.
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)
Advantages:
Adopt quality hydraulic cylinder-standard raw material from leading mills
High precision with tight allowance
No defects on internal surface
High concentricity and small wall thickness tolerance
High straightness
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:
