Hydraulic pipe

steelfor power plantsfor agricultural applications

Product overview
The EAST AI 42CrMo4 honed tube is a quenched-and-tempered alloy-steel hydraulic cylinder bore produced for heavy-duty and high-cycle applications. It combines controlled mechanical properties with a precision honed inner surface for reliable piston sealing and extended service life.

Key product information

• Model：Honed Tube
• Brand：EAST AI
• Material：42CrMo4 (quenched and tempered alloy steel)
• Max length：13 m
• ID tolerance：H8–H10
• Straightness：0.5 / 1000
• Inner roughness：≤0.4 μm (honed finish Ra 0.2–0.4 μm)
• Packing：Wooden cases

Advantages

• High mechanical strength — Optimized heat treatment for yield and tensile strength.
• Excellent wear resistance — Suitable for abrasive and high-cycle hydraulic environments.
• Superior fatigue resistance — Engineered to withstand repetitive pressure fluctuations.
• Dimensional accuracy — Honed to tight ID tolerances for consistent piston fit.
• Smooth bore finish — Polished inner surface reduces friction and extends seal life.
• Optional surface protection — Anti-rust oil, phosphate coating, or chrome plating available.

Production process

• Raw material selection — 42CrMo4 sourced to meet EN 10297 / DIN 2391 requirements.
• Forming — Hot rolling or cold drawing to produce seamless tubes.
• Heat treatment — Quenching and tempering to achieve specified hardness and toughness.
• Pre-machining — Boring or rough machining of the inner diameter.
• Honing / Skiving & roller burnishing — Final bore finishing to Ra 0.2–0.4 μm.
• Dimensional calibration — Measurement and verification to ISO H8/H9 tolerances.
• Surface protection — Inner/outer anti-rust treatment for storage and shipment.
• Final inspection — 100% quality checks before packaging.

Application scenarios

• Construction machinery: excavators, loaders, cranes.
• Agricultural equipment: tractors, harvesters.
• Mining machinery: drill rigs, dump trucks, crushers.
• Industrial equipment: presses, machine tools, automation systems.
• Marine & offshore equipment: cranes, winches (with appropriate corrosion protection).
• Energy sector: hydraulic systems in wind turbines and oilfield equipment.

Factory inventory
Large stock of standard-size 42CrMo4 honed tubes for urgent orders. Over 2,000 tons available; custom sizes produced on request. Global export packaging and logistics support ready for immediate shipment.

Quality testing

• Chemical composition analysis (EN 10297 compliance).
• Mechanical testing: yield, tensile strength, hardness, elongation.
• Ultrasonic testing for internal defects.
• Dimensional inspection: OD, ID, wall thickness, roundness, straightness.
• Surface roughness measurement to verify bore finish.
• Optional hydraulic pressure test to validate in-service performance.

Certificates

• ISO 9001 Quality Management System
• Material Test Certificates (EN 10204 3.1 / 3.2)
• Third-party inspection reports (SGS, BV, TUV)
• GL approval for material manufacturers (AMM)

Technical specifications

• Model: Honed Tube
• Brand: EAST AI
• Material: 42CrMo4 (quenched & tempered)
• Max length: 13 m
• ID tolerance: H8–H10
• Dimensional tolerance standard: ISO H8 / H9
• Straightness: 0.5 / 1000
• Inner bore roughness: ≤0.4 μm; honed Ra 0.2–0.4 μm
• Packing: Wooden cases
• Typical applications: Hydraulic cylinders for mobile equipment and heavy-duty systems
• Stock: >2000 tons available