Hydraulic pipe

steelfor hydraulic systemsheavy-duty

Overview
Skived and Rolled Tube E355 (St52) is manufactured from E355 (St52) low-alloy steel and processed by skiving followed by roller burnishing to deliver a finished bore with tight tolerances and a smooth internal surface suitable for hydraulic cylinder applications.

Key product attributes

• Model: Skived and Rolled Tube
• Brand: EAST AI
• Material: E355 (St52) alloy steel
• Maximum length: up to 15 m (custom lengths available; some sections reference up to 13 m)
• ID tolerance: H8–H10 (typical finished bore tolerance)
• Straightness: 0.5/1000
• Inner surface roughness: Ra ≤ 0.4 µm (summary may reference Ra ≤ 0.2 µm for specific grades)
• Packing: anti-rust oil on rod surface; each rod wrapped in paper and packed in wooden case (customizable)

Technical specifications

• Material: E355 alloy steel (St52)
• Tube type: Skived and Rolled (finished bore)
• Surface finish: bore-finished, polished inner surface
• Diameter tolerance: H8–H10
• Surface roughness: Ra ≤ 0.4 µm (variant Ra ≤ 0.2 µm noted)
• Straightness: 0.5/1000
• Maximum length: up to 13–15 m depending on configuration; custom lengths available
• Typical applications: hydraulic cylinders for mobile equipment and industrial machinery

Advantages

• Superior inner surface finish reduces seal friction and wear, improving service life.
• Finished bore eliminates or reduces the need for additional honing before assembly.
• High dimensional accuracy (concentricity and roundness) from skiving and roller burnishing.
• E355 mechanical properties suitable for dynamic, heavy-duty hydraulic systems.

Applications

• Hydraulic cylinders (single- and double-acting)
• Construction machinery (excavators, loaders, cranes)
• Industrial equipment (presses, injection moulding machines, heavy automation)
• Mobile machinery (agricultural, forestry, material handling)
• Engineering projects requiring long, straight, wear-resistant hydraulic tubes

Production, factory & stock

• Manufacturing process: skiving to control diameter followed by roller burnishing to polish the inner bore.
• Precision diameter control to H8–H10 for piston fit.
• Custom lengths produced; standard sizes stocked for rapid dispatch.
• Equipment: CNC, skiving machines, roller burnishing units and inspection tools to support large-volume projects.

Quality inspection & certificates

• Dimensional checks for bore diameter and straightness using precision gauges.
• Surface roughness verification to ensure target Ra (page references Ra ≤ 0.4 µm).
• Roundness measurement to guarantee piston fit and minimize leakage.
• Mechanical testing (tensile, hardness, fatigue) and optional NDT (ultrasonic or magnetic particle) for critical orders.
• Certificates: ISO 9001 and material test reports (chemical composition, tensile, hardness); GL indications referenced on page.

Characteristics / technical data

• Material: E355 (St52) alloy steel
• Product name: Skived and Rolled Tube (finished bore)
• Surface finish: bore-finished, smooth; Ra ≤ 0.4 µm (summary may indicate Ra ≤ 0.2 µm)
• ID tolerance: H8–H10
• Straightness: 0.5/1000
• Maximum length: up to 13–15 m depending on section; customizable lengths available
• Applications: hydraulic cylinders for mobile equipment, industrial machinery and heavy-duty systems
• Packing: anti-rust oil, paper roll wrapping and wooden case; customizable