Hydraulic pipe

pneumaticsteelheavy-duty

Product overview
The CK45 Skived and Roller Burnished Tube is a high-precision steel tube engineered for hydraulic and pneumatic cylinder applications. Made from premium CK45 seamless steel, the tube undergoes skiving and roller burnishing to achieve a mirror-like internal surface, high dimensional accuracy and enhanced mechanical performance. With inner diameter tolerance H8 and inner surface roughness down to Ra ≤ 0.2 μm, the tube provides superior wear resistance, reliable sealing and extended service life. Ready for direct assembly in hydraulic cylinder barrels.

Key product information

• Brand: EAST AI
• Material: CK45 (DIN 1.1191 / SAE 1045)
• Length: Max. 12 m (custom cut lengths available)
• ID Tolerance: 20 mm – 400 mm (H8)
• Straightness: ≤ 0.3 mm/m
• Application: Hydraulic cylinders for mobile equipment, industrial machinery and heavy-duty systems
• Packing: Wooden cases (export packaging options available)
• Inner surface roughness: 0.1–0.4 μm (typical; can achieve Ra ≤ 0.2 μm)

Technical Specifications
Material — CK45 (DIN 1.1191 / SAE 1045)
Outer Diameter (OD) — 30 mm – 500 mm
Inner Diameter (ID) — 20 mm – 400 mm
Wall Thickness — 5 mm – 50 mm
Inner Diameter Tolerance — H8
Inner Surface Roughness — Ra ≤ 0.2 μm
Straightness — ≤ 0.3 mm/m
Hardness — 160 – 210 HB
Roundness — ≤ 0.03 mm
Length — Up to 12 meters (custom cut lengths available)
Surface Protection — Anti-rust oil coating / VCI film / Customized packaging

Manufacturing Process

• Raw Material Selection
  Start from high-grade CK45 seamless steel tubes inspected for chemical composition and mechanical properties.
• Cold Drawing or Honing (if applicable)
  Tubes may be cold drawn or honed to refine initial inner diameter and surface before skiving.
• Skiving
  A rotating cutting tool removes a small layer from the inner surface to produce a uniform, smooth internal surface and correct minor geometric deviations.
• Roller Burnishing
  Cold-working with hard rollers compresses the inner surface to produce a mirror-like finish, increased hardness and improved surface integrity.
• Final Inspection and Surface Treatment
  Tubes are cleaned, dried and coated with anti-rust oil or VCI film; each piece is checked for roughness, roundness, hardness, straightness and dimensional tolerances.

Advantages

• Superior Inner Surface Finish
  Roller burnishing reduces surface roughness to Ra ≤ 0.2 μm, minimizing friction and improving sealing performance.
• Enhanced Dimensional Accuracy
  Strict H8 tolerance for inner diameter allows direct use in hydraulic and pneumatic cylinder barrels without additional machining.
• Improved Wear Resistance
  Cold working increases surface hardness and fatigue resistance for demanding environments.
• Reduced Maintenance and Downtime
  High-quality finish and accurate tolerances reduce leaks and component failures.
• Ready-to-Use
  Tubes are supplied ready for assembly and typically require no further honing or finishing.

Common Applications

• Hydraulic cylinders for heavy-duty machinery (excavators, bulldozers, loaders, cranes)
• Pneumatic cylinders for automation systems and industrial robots
• Agricultural equipment (tractors, harvesters, hydraulic lifting systems)
• Construction machinery (concrete pump trucks, pile drivers, lift platforms)
• Material handling systems (forklifts, lifting arms, hydraulic lifts)
• Mining equipment and other high-pressure hydraulic systems

Quality Control & Testing
Production and finished tubes undergo stringent checks including chemical composition analysis (spectrometers), ultrasonic testing (UT) for internal defects, surface roughness measurement with profilometers, inner diameter gauge checks for H8 tolerance, straightness checks with laser/digital tools and optional hydrostatic or salt spray testing. Production follows recognized standards such as DIN 2391, EN 10305 and ASTM A519 and the supplier operates under ISO 9001:2015 quality management.

Packaging & Delivery

• End protection with plastic caps
• Wrapped in anti-rust VCI film or oiled paper
• Bundled with steel straps and labeled with identification tags
• Optional wooden cases or steel frames for export packaging
• Delivered with mill test certificates and inspection reports
• Typical lead times: 7 to 20 days depending on order size and customization; common delivery terms include FOB, CIF and DDP

Customization Options

• Custom lengths and diameters
• Precision cut-to-length service
• Bore honing or chrome plating (upon request)
• Welded end caps or thread machining
• Stamping and marking with heat numbers or logos

Technical characteristics / Specifications

• Material: CK45 (DIN 1.1191 / SAE 1045)
• OD range: 30 mm – 500 mm
• ID range: 20 mm – 400 mm
• Wall thickness: 5 mm – 50 mm
• ID tolerance: H8
• Inner roughness: Ra ≤ 0.2 μm (typ.)
• Straightness: ≤ 0.3 mm/m
• Hardness: 160 – 210 HB
• Roundness: ≤ 0.03 mm
• Length: up to 12 m (custom cutting available)
• Surface protection: anti-rust oil / VCI film / customized packaging
• Packing: plastic end caps, VCI film, steel straps, wooden export cases