Product Overview

Our EN10305-2 E355 Cold Drawn Precision Steel Tube is a high-performance DOM (Drawn Over Mandrel) tubing specifically manufactured for hydraulic cylinder applications. Through advanced cold drawing technology combined with ERW pre-tube welding, these precision tubes achieve exceptional dimensional accuracy, surface finish, and mechanical properties that rival seamless alternatives. With 90% of the US hydraulic cylinder market utilizing welded cold-drawn tubes, this product represents the industry standard for cost-effective, high-precision hydraulic components.

Key Features & Advantages

• Superior Dimensional Accuracy: Cold drawing over mandrel achieves tight OD/ID tolerances of ±0.1mm with excellent concentricity (TIR less than 0.2mm), reducing downstream machining requirements.
• Enhanced Mechanical Properties: E355 grade steel with yield strength of 355-450 MPa and tensile strength of 490-630 MPa, providing excellent load-bearing capacity for hydraulic systems.
• Premium Surface Finish: Inner surface roughness Ra less than 0.8 micrometers in the +N delivery condition, ensuring optimal seal performance and reduced friction in hydraulic cylinders.
• Multiple Delivery Conditions: Available in +C (cold drawn/hard), +LC (cold drawn/soft), +SR (stress relieved), +A (annealed), and +N (normalized) to match specific fabrication requirements.
• Complete Weld Integrity: 100% eddy current and ultrasonic testing ensures flawless weld seam quality, with the weld line becoming virtually invisible after cold drawing.

Application Scenarios

• Hydraulic cylinder barrels for construction machinery (excavators, loaders, bulldozers)
• Agricultural equipment hydraulic systems (tractors, harvesters, sprayers)
• Automotive shock absorbers, steering columns, and stabilizer bar tubes
• Industrial pneumatic cylinders and telescopic cylinder systems
• Precision mechanical tubing for machine tools and automation equipment

Company Capabilities

• Advanced Production Line: SG/76 Enhanced High-Frequency Welding Tube Line with German edge milling and Norwegian EFD welding technology
• Quality Assurance: 100% eddy current and ultrasonic testing, full mechanical property verification
• Custom Processing: Honed ID, chrome-plated surfaces, custom cutting, chamfering, and end finishing available
• Supply Capacity: 20,000 tons annual output, MOQ 1 ton, delivery 7-10 working days
• Export Packaging: Anti-rust oil protection, seaworthy wooden cases or hexagonal bundles with waterproof wrapping
• Technical Support: Free samples and comprehensive material data sheets provided