Hydraulic tube

steelfor hydraulic systemsheavy-duty

Product Overview
40Cr Honed Tube is a steel tube used in hydraulic cylinders and precision engineering. With a machined honed bore and controlled mechanical properties, it provides reliable sealing performance, reduced friction, and extended service life for hydraulic systems. The product is supplied for distributors, stockists, and engineering manufacturers requiring consistent dimensional and surface specifications.

Advantages

• High mechanical strength: 40Cr alloy steel offers good load-bearing capacity and impact resistance after heat treatment.
• Wear resistance: Suitable for high-frequency and heavy-duty hydraulic applications.
• Precision honed bore: Low surface roughness reduces friction and improves sealing efficiency.
• Extended component life: Minimises wear on seals and pistons, extending maintenance intervals.
• Heat treatment compatible: Can be quenched and tempered to achieve target hardness and fatigue resistance.
• Wide application range: Compatible with construction, mining, lifting and industrial hydraulic systems.

Production Process

• Raw material selection: Seamless 40Cr alloy steel pipes sourced to specification.
• Cold drawing / hot rolling: Refines dimensions and improves mechanical properties.
• Heat treatment (quenching & tempering): Adjusts hardness and strength.
• Boring: Prepares inner bore for precision honing.
• Honing: Achieves required ID tolerance and surface finish.
• Skiving & roller burnishing (optional): Further improves surface roughness and bearing properties.
• Straightening: Ensures axial alignment and dimensional accuracy.
• Inspection: Dimensional, mechanical and surface tests performed.
• Packing & storage: Rust‑proof packaging for transport and warehousing.

Applications

• Hydraulic cylinders for excavators, loaders, bulldozers and construction machinery.
• Mining equipment: hydraulic supports, rock drills and related systems.
• Industrial machinery: presses, injection moulding machines, forging equipment.
• Lifting platforms and cranes: telescopic and hydraulic jacks.
• Agricultural machinery: tractors, harvesters and hydraulic implements.
• Energy sector: hydraulic systems in wind, hydro and oilfield equipment.

Quality Inspection & Testing

• Dimensional inspection: OD, ID and wall thickness measured with precision instruments.
• Surface roughness test: Ra checked to ensure smooth bore finish (typ. ≤0.4 µm).
• Hydraulic pressure test: Verifies tube strength under working pressure.
• Mechanical properties test: Tensile strength, hardness and elongation testing.
• Ultrasonic & eddy current testing: Detects internal and surface defects.
• Salt spray test (optional): Verifies corrosion protection when required.

Technical Specifications

• Model: Honed Tube
• Brand: EAST AI
• Material: 40Cr
• Length: Max. 13 m
• ID tolerance: H8 ~ H10
• Straightness: 0.5/1000
• Application: Hydraulic cylinders for mobile equipment, industrial machinery and heavy-duty systems
• Packing: Wooden cases
• Roughness: ≤0.4 µm
• Stock & supply capability: Large stock of common diameters; custom machining (cutting, deep boring, honing, roller burnishing) on request
• Production capacity: Advanced honing and skiving equipment ensuring stable monthly output