Hydraulic tube

steelheavy-dutymining and quarrying

Overview
The Q355B honed tube is a high-strength precision steel tube designed for hydraulic cylinder applications. Manufactured using cold drawing, heat treatment and multi-step honing, it provides tight dimensional control, high toughness and a polished internal bore to reduce friction, improve sealing and extend hydraulic system service life. Suitable for construction, lifting, mining, agricultural and industrial machinery where reliable cylinder performance is required.

Product Details

• Model: Honed Tube
• Brand: EAST AI
• Material: Q355B
• Length: Max. 13 m
• ID tolerance: H8 (customizable on request)
• Straightness: 0.5/1000
• Application: Hydraulic cylinders for mobile equipment, industrial machinery and heavy-duty systems
• Packing: Wooden cases
• Roughness: ≤0.4 µm (internal bore)

Advantages of Q355B Honed Tube

• High strength and toughness: Q355B low-alloy steel offers improved mechanical properties for heavy-duty cylinder applications.
• Precision surface finish: Honing achieves a smooth bore (typical Ra 0.2–0.8 µm), improving sealing and reducing leakage.
• Accurate dimensional tolerance: Tight ID/OD tolerances with controlled roundness and straightness ensure proper fit with piston seals.
• Good weldability and machinability: Q355B is suitable for welding and machining, enabling custom cylinders and reduced manufacturing time.
• Extended service life: Reduced friction and wear preserve seals and increase cylinder lifespan; good fatigue resistance for harsh conditions.

Production Process

• Raw material selection: Q355B seamless tubes with certified quality; chemical and mechanical testing.
• Cold drawing: Refines microstructure, improves strength and dimensional accuracy.
• Heat treatment: Stress-relieving or normalization for toughness and stability.
• Boring and rough machining: Inner bore prepared to remove defects before honing.
• Honing: Multi-step honing to achieve target roughness (Ra 0.2–0.8 µm) and control roundness/straightness.
• Final inspection: Size, roughness, hardness and mechanical performance checks.

Applications

• Construction machinery (excavators, loaders, bulldozers, cranes)
• Lifting equipment (aerial work platforms, scissor lifts, forklifts)
• Mining equipment (supports, drilling machines, dump trucks)
• Agricultural machinery (harvesters, tractors, irrigation systems)
• Industrial systems (presses, hydraulic presses, manufacturing equipment)

Factory Inventory and Supply Capability

• Large stock of standard Q355B honed tube sizes for urgent deliveries.
• Standard OD/ID combinations available; custom production for non-standard dimensions.
• Monthly production capacity: 2,000+ tons of honed tubes.
• Stock-ready sizes can be shipped within days to minimize downtime.

Quality Inspection

• Dimensional inspection: OD, ID, wall thickness and straightness measurement.
• Surface roughness test: Ensuring Ra ≤0.8 µm (typical Ra 0.2–0.8 µm).
• Hardness testing: Confirming material strength and durability.
• Hydraulic pressure test: Verifying sealing and pressure resistance.
• Eddy current and ultrasonic testing: Detecting internal or external defects.
• Salt spray test: Available on request for corrosion resistance evaluation.

Certificates and Compliance

• ISO 9001:2015 Quality Management System
• GL Approval of Material Manufacturers (AMM)
• Mill Test Certificate (EN 10204 3.1/3.2)
• Compliance with DIN 2391, EN 10305 and ASTM A519 standards

Technical Specifications

• Material: Q355B (low-alloy high-strength structural steel)
• Model / Commercial name: Honed Tube
• Brand: EAST AI
• Maximum length: 13 m
• ID tolerance: H8 (customizable)
• Straightness: 0.5/1000
• Internal surface roughness: Typical Ra 0.2–0.8 µm; guaranteed ≤0.4 µm in standard offering
• Applicable standards: DIN 2391, EN 10305, ASTM A519; MTC per EN 10204 3.1/3.2