Hydraulic pipe

pneumaticcarbon steelheavy-duty

Product overview ST52 Honed Tube is a high-precision seamless steel tube widely used in hydraulic cylinders, machinery and engineering applications. With a fine internal finish, tight dimensional tolerances and high mechanical strength, it ensures smooth piston movement and long service intervals. Manufactured using advanced honing or skiving & roller burnishing processes, the tube offers low roughness, wear resistance and optional corrosion protection for demanding hydraulic and industrial systems.

Product details

• Model: Honed Tube
• Brand: EAST AI
• Material: ST52
• Maximum length: 13 m
• Inner diameter tolerance: H8 ~ H10
• Straightness: 0.5/1000
• Application: Hydraulic cylinders for mobile equipment, industrial machinery and heavy-duty systems
• Packing: Wooden cases with protective end caps
• Surface roughness: ≤0.4 μm (typical Ra ≤0.2–0.4 μm after honing/SRB)

Advantages of ST52 Honed Tube

• High strength and durability due to ST52 steel grade, suitable for heavy-duty hydraulic applications.
• Superior internal finish from honing or skiving & roller burnishing, extending seal life.
• Accurate dimensional tolerances to ensure smooth piston and rod movement.
• Reduced friction and lower energy loss thanks to a polished bore.
• Optional corrosion-resistant coatings or plating for harsh environments.
• Available in a wide range of inner diameters, wall thicknesses and lengths to meet project requirements.
• Proven reliability trusted by global OEMs and cylinder manufacturers.

Production process

• Raw material selection: High-grade ST52 seamless steel tubes selected for consistent chemistry and mechanical properties.
• Cold drawing or hot rolling: Tube forming to refine grain structure and improve dimensional accuracy.
• Heat treatment: Normalizing or stress relieving to enhance toughness and remove internal stresses.
• Boring & turning: Rough machining of the inner diameter to remove defects and prepare for finishing.
• Honing or skiving & roller burnishing: Final machining to achieve precise tolerances and mirror-like surface finish.
• Cleaning & deburring: Thorough removal of oil, chips and residues.
• Inspection & testing: Dimensional checks, surface roughness measurement, hardness and pressure testing.
• Packaging & stocking: Protective end caps, anti-rust oil and seaworthy wooden cases for global delivery.

Application scenarios

• Hydraulic cylinder barrels for construction and agricultural mobile equipment.
• Pneumatic cylinders where a smooth bore improves efficiency.
• Mining and quarrying machinery: loaders, crushers and drilling rigs.
• Oil & gas equipment: hydraulic systems for offshore and onshore rigs.
• Industrial automation: presses, robotics and machine tools requiring precise motion control.
• Marine and offshore machinery: winches, cranes and deck equipment.
• Material handling equipment: forklifts, cranes and lifting platforms.

Factory inventory and supply The factory holds a large inventory of ST52 Honed Tubes for fast delivery. Standard sizes are stocked to cover common hydraulic cylinder applications; custom dimensions are available for OEM and project requirements. Warehouse capacity exceeds 5,000 tons of honed and SRB tubes ready to ship. Fast dispatch from Wuxi (near Shanghai port) for global distribution.

Quality inspection Every ST52 Honed Tube undergoes strict quality control. Inspection items include chemical composition analysis (spectrometer), dimensional inspection (bore diameter, wall thickness, straightness), surface roughness measurement (Ra), hardness testing, hydrostatic pressure test and optional salt spray test for coated/plated tubes.

Certificates Available documentation and certifications: ISO 9001:2015 Quality Management Certificate, GL Approval of Material Manufacturers (AMM), Material Test Certificate (EN 10204 3.1/3.2) and third-party inspection reports (SGS, BV, TUV).

Technical specifications

• Commercial model: Honed Tube
• Brand: EAST AI
• Material / Grade: ST52
• Maximum length: 13 m
• Inner diameter tolerance: H8 ~ H10
• Straightness: 0.5 per 1000
• Surface roughness: ≤0.4 μm (typical Ra ≤0.2–0.4 μm after honing/SRB)
• Packing: Wooden cases with protective end caps and anti-rust oil
• Typical production finishes: Honed, skived & roller burnished (SRB)
• Available options: Protective coatings or plating for enhanced corrosion resistance
• Quality & testing: Chemical composition analysis, dimensional inspection, surface roughness testing, hardness testing, hydrostatic pressure testing, optional salt spray test
• Standards / certificates: ISO 9001:2015; Material Test Certificate EN 10204 3.1/3.2; GL Approval (AMM); third-party inspection reports available (SGS, BV, TUV)