Seamless Tubes For Hydraulic And Pneumatic Systems
Roller burnished tube is a type of metal tube that has undergone a specialized finishing process to achieve a smooth and polished surface texture.
Seamless Tubes For Hydraulic And Pneumatic Systems
Roller burnished tube is a type of metal tube that has undergone a specialized finishing process to achieve a smooth and polished surface texture.
Roller-Burnished Tubes are precision-engineered steel tubes with a smooth, hardened bore, designed for hydraulic cylinder tubes and pneumatic cylinder tubes. These tubes undergo a specialized process combining skiving and roller burnishing to achieve exceptional surface finish and dimensional accuracy. Conforming to standards like DIN 2391, EN 10305-1, and ASTM A519, they offer superior durability and wear resistance, making them ideal for high-pressure applications in industries such as construction, automotive, and heavy machinery.
The roller burnishing process involves pressing hardened steel rollers against the inner surface of the tube, cold-working the material to create a mirror-like finish (Ra 0.05–0.20 µm) and improve surface hardness. This process eliminates the need for additional machining, providing ready-to-use tubes for hydraulic cylinder manufacturing. Available in various materials, including carbon steel (ST52, CK45), alloy steel (AISI 4140), and stainless steel, these tubes are tailored for diverse industrial needs.
This process involves the use of precision rollers to apply pressure and polish the outer surface of the tube, resulting in enhanced strength, improved corrosion resistance, and reduced friction.
| Grade | C (% max) | Si (% max) | Mn (%) | P (% max) | S (% max) |
|---|---|---|---|---|---|
| ST52 (DIN 2391) | 0.22 | 0.55 | 1.60 | 0.025 | 0.015 |
| E355 (EN 10305-1) | 0.22 | 0.55 | 1.60 | 0.025 | 0.015 |
| ASTM A519 1026 | 0.22–0.28 | 0.15–0.35 | 0.60–0.90 | 0.040 | 0.050 |
| Grade | Tensile Strength (MPa min) | Yield Strength (MPa min) | Elongation (% min) |
|---|---|---|---|
| ST52 (DIN 2391) | 600 | 520 | 14 |
| E355 (EN 10305-1) | 580 | 450 | 15 |
| ASTM A519 1026 | 515 | 350 | 15 |
| Feature | Honed Tubes | Standard Tubes |
|---|---|---|
| Material Type | Carbon/Alloy Steel (ST52, E355) | Carbon Steel |
| Surface Finish | Ra ≤0.4 µm (Honed/SR-B) | Ra ≥1.0 µm |
| Tolerance | H7–H9 | H11 or lower |
| Tensile Strength (MPa) | 515–600 | 400–500 |
| Applications | Hydraulic/Pneumatic Cylinders | General Piping |
| Cost | Higher (precision processing) | Lower |
| Key Advantage | Precision bore, extended seal life | Cost-effective for non-precision uses |
| ID (mm) | TOLERANCE (mm) | |||
|---|---|---|---|---|
| H7 | H8 | H9 | H10 | |
| ≦30 | +0.021/0 | +0.033/0 | +0.052/0 | +0.084/0 |
| 30 – ≦50 | +0.025/0 | +0.039/0 | +0.062/0 | +0.100/0 |
| 50 – ≦80 | +0.030/0 | +0.046/0 | +0.074/0 | +0.120/0 |
| 80 – ≦120 | +0.035/0 | +0.054/0 | +0.087/0 | +0.140/0 |
| 120 – ≦180 | +0.040/0 | +0.063/0 | +0.100/0 | +0.160/0 |
| 180 – ≦250 | +0.046/0 | +0.072/0 | +0.115/0 | +0.185/0 |
| 250 – ≦315 | +0.052/0 | +0.081/0 | +0.130/0 | +0.210/0 |
| 315 – ≦700 | +0.057/0 | +0.089/0 | +0.140/0 | +0.230/0 |
This will provide long piston seal life and prevent failure of the cylinder. The tube material is selected on the basis of application & working pressure.
The seamless tube for hydraulic cylinders, obtained from high quality cold drawn tubes, available in a wide dimensional range.
Select round bars of suitable size that meet the required standards as raw material bars for processing.
Process the steel round bar through free forging and heat treatment.
Use a forging hammer to straighten the treated raw material bar.
Produce seamless mother pipes from the round bars using hot rolling, hot extrusion, or hot piercing.
Cold draw the mother pipe to create cold-drawn seamless tubes (CDS tubes) and prepare pre-honed tubes.
The honing process, a form of grinding and a finishing method, enhances surface finish and wear resistance with high productivity and machining accuracy.
Apply NBK finish, phosphate-coating and normalizing the tubes for corrosion resistance, followed by oiling inside and outside.
Heat metals at a high temperature and allow them to cool naturally to room temperature, creating a tougher, more formable, harder, and ductile product.
Inspect the finished honed tubes according to customer requirements and standards, ensuring compliance with size, accuracy, mechanical properties, and chemical composition.
Explore honed tubes with targeted long-tail keywords, covering specifications, applications, and manufacturing for hydraulic and pneumatic systems.
Note: Honed tubes are precision-engineered for hydraulic and pneumatic systems, meeting DIN 2391, EN 10305-1, and ASTM A519 standards. Contact suppliers for detailed specifications.
The tube size e quality of steel required for the project were not standard, so it had been necessary not only to manufacture the tube on customer’s specification, starting from a specific raw material tube but also to plan a peculiar manufacturing process.
For example, also both left ends had been treated in order to let the assembly of the piece. It has to be stressed the importance of honing the left ends and the roundesses where the O-Ring is allocated since they impact dramatically on the system performance.
Honed tubes, characterized by their precisely machined inner surface, are essential components in various industrial applications where high accuracy and surface finish are crucial. They are used in hydraulic and pneumatic cylinders, offering precision and durability in construction, automotive, and industrial machinery applications.
They are a primary component in hydraulic cylinders, providing precise control and power in various applications.
Supports hydraulic systems in heavy vehicles and suspension systems.
Used in injection molding and press machines for precision operation.
Powers pneumatic cylinders in robotic and automated equipment.
Used in hydraulic systems for tractors and harvesters, providing precise control and power.
Supports hydraulic systems in marine equipment and vessels.
Why Honed Tubes? These tubes, made from high-quality seamless steel (e.g., ST52, E355), offer precision bore and corrosion resistance, ensuring reliable performance in high-pressure hydraulic and pneumatic systems.
Roller-burnished tubes offer precision bore and du...
