Hydraulic pipe

pneumaticcarbon steelfor compressors

Product overview
Q355D Skived and Rolled Tube is a seamless steel tube processed by skiving and roller burnishing to provide a precision bore suited for hydraulic cylinder applications. The process ensures tight ID tolerances, excellent surface finish and mechanical properties suitable for mobile and industrial hydraulic systems.

Key product details

• Model: Q355D
• Brand: EAST AI
• Material: Q355D seamless steel
• Length: Max. 13m
• 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

Advantages of Q355D Skived and Rolled Tube

• Superior surface finish: Bore roughness typically Ra 0.2–0.4 μm to reduce seal wear.
• High dimensional accuracy: Controlled ID tolerance, roundness and straightness facilitate assembly and sealing.
• Strong mechanical properties: Q355 series steel delivers suitable yield strength and impact resistance for heavy-duty use.
• Extended cylinder life: Smooth bore reduces friction and improves hydraulic efficiency.
• Corrosion protection: Anti-rust oil coating and protective packaging for long-term storage.
• Cost-effective for bulk supply: Large stock and flexible length cutting services available.
• Versatility: Suitable for hydraulic and pneumatic cylinders, lifting equipment and construction machinery.

Production process

• Raw material selection: High-quality Q355 seamless steel tubes selected.
• Cold drawing: Tubes cold drawn to reach required dimensions and mechanical properties.
• Heat treatment: Stress relieving and normalization to improve toughness.
• Straightening: Correct bending to meet straightness requirements.
• Skiving: Internal cutting to remove material and approach target tolerance.
• Roller burnishing: Bore surface compressed and smoothed to achieve mirror-like finish and dimensional accuracy.
• Inspection: Bore size, roundness, surface roughness and straightness checked.
• Cleaning & anti-rust protection: Tubes cleaned and coated with protective oil.
• Packaging: Wooden cases or steel frames with plastic end caps for safe delivery.

Applications

• Hydraulic cylinders for construction machinery, agricultural and mining equipment
• Pneumatic cylinders, air compressors and automation systems
• Lifting equipment: forklifts, aerial platforms, cranes
• Construction machinery: excavators, bulldozers, loaders
• Industrial equipment: presses, injection moulding machines
• Marine & offshore hydraulic systems (shipbuilding, drilling platforms)

Factory stock & supply capability

• Large inventory of standard sizes for fast delivery
• Customized processing: cutting, machining, special size production
• High capacity: advanced skiving and roller burnishing equipment with monthly production in thousands of tons
• Reliable packing methods to guarantee safe global transport

Quality control & testing

• Dimensional checks: OD, ID, wall thickness
• Surface roughness measurement: ensuring Ra ≤ 0.4 μm
• Straightness test: verify compliance with standards
• Ultrasonic testing (UT) to detect internal defects
• Hydraulic pressure test to confirm performance under working pressure
• Salt spray test (optional) for corrosion resistance assessment

Certificates

• ISO 9001:2015 Quality Management System
• GL – Germanischer Lloyd Approval of Material Manufacturers (AMM)
• Mill Test Certificate (MTC) according to EN 10204 3.1
• Third-party inspection available (SGS, BV, TUV)

Technical specifications / caractéristiques

• Model: Q355D
• Commercial designation: Q355D
• Brand: EAST AI
• Material: Q355D seamless steel
• Max length: 13 m
• ID tolerance: H8–H10
• Straightness: 0.5/1000
• Surface roughness: Ra 0.2–0.4 μm (typical), guaranteed ≤ 0.4 μm
• Packing: Wooden cases or steel frames with plastic end caps
• Typical applications: hydraulic and pneumatic cylinders, lifting and construction equipment, industrial machinery, marine/offshore systems