All mechanical properties are tested and verified in accordance with EN 10305-1 standards, at room temperature, covering the full dimensional range of our tubes.
| Property |
Test Standard |
Guaranteed Requirement |
Typical Production Range |
| Upper Yield Strength (ReH) |
EN ISO 6892-1 |
≥ 355 MPa |
360 – 390 MPa |
| Tensile Strength (Rm) |
EN ISO 6892-1 |
490 – 630 MPa |
510 – 580 MPa |
| Elongation After Fracture (A) |
EN ISO 6892-1 (L₀=5.65√S₀) |
≥ 22 % |
24 – 28 % |
| Charpy V-Notch Impact Energy (KV) |
EN ISO 148-1 (Longitudinal, Room Temperature) |
≥ 27 J |
30 – 45 J |
Unmatched Features & Competitive Advantages
Our E355+N seamless steel tubes are purpose-built to solve core challenges in high-stakes industrial and automotive applications, delivering tangible benefits to your production and end products:
1. Full EN 10305-1 Compliance for Global Supply Chain Access
We strictly follow the full technical and quality requirements of the EN 10305-1 European standard, the global benchmark for precision steel tubes in automotive and hydraulic sectors. This compliance guarantees seamless acceptance in European, North American and global automotive supply chains, eliminating regulatory barriers and qualification risks for your components.
2. Superior E355+N Normalized Material for Exceptional Mechanical Performance
Delivered in a fully normalized (+N) condition, our E355+N tubes feature a refined, uniform metallographic structure that delivers guaranteed mechanical performance per the above specifications:
- High tensile strength and stable yield strength for heavy-load and high-pressure working conditions
- Outstanding impact toughness and fatigue resistance under dynamic load cycles, critical for long-service-life automotive and hydraulic components
- Consistent mechanical properties across the full tube length and every production batch, minimizing performance variability in your manufacturing process
3. Ultra-High Dimensional Precision & Premium Surface Finish
Engineered for precision-critical applications, our tubes set the bar for dimensional accuracy:
- Tight tolerance control on outer diameter, inner diameter and wall thickness, with extremely low eccentricity
- Smooth, defect-free inner and outer surface finish, which reduces fluid flow resistance in oil and fuel lines, minimizes wear in bushing and sleeve applications, and eliminates costly secondary finishing operations
- Excellent formability for bending, flaring, expanding and welding processes, without cracking or deformation, streamlining your component fabrication workflow
4. Excellent Pressure Resistance & Durability in Harsh Environments
Our tubes are designed to perform reliably in extreme working conditions:
- Superior burst pressure and long-term hydrostatic stability, ideal for high-pressure hydraulic cylinder and fluid transmission systems
- Consistent performance in fluctuating temperatures and dynamic load cycles, ensuring stable operation in automotive powertrain, brake and fuel system applications
- Good machinability and compatibility with common surface treatment processes, for enhanced corrosion resistance in harsh service environments
5. Comprehensive Size Range & Customization Flexibility
With an outer diameter range spanning 3mm to 120mm, our product line covers the full spectrum of your application needs — from ultra-precision miniature automotive oil lines to heavy-duty hydraulic cylinder tubes. We offer full customization of wall thickness, tolerance classes, cut length and delivery conditions, to perfectly match your unique design and production requirements, enabling one-stop procurement and simplified supply chain management.
6. Rigorous Quality Control & Full Batch Traceability
Quality is embedded in every step of our production process:
- Strict incoming inspection of raw materials, with verified chemical composition and mechanical properties
- Real-time in-process monitoring of all production stages, to ensure 100% compliance with EN 10305-1 standards
- Comprehensive final inspection, including dimensional verification, non-destructive testing (NDT), mechanical property testing and surface quality inspection
- Complete traceability for every batch, with full material test reports provided, meeting the strictest quality management requirements of the automotive industry (aligned with IATF 16949 standards)
Typical Industry Applications
Our EN 10305-1 E355+N precision seamless tubes are the preferred choice for a wide range of high-demand applications, including:
- Automotive Industry: Fuel injection lines, engine oil circuits, brake system components, power steering tubes, and structural bushing parts
- Hydraulic & Pneumatic Systems: Precision hydraulic cylinder barrels, piston rods, fluid transmission pipes, and pneumatic actuator components
- General Precision Engineering: Machinery sleeves and bushings, shaft components, fastener raw materials, and high-precision mechanical structural parts
- Fluid Control Equipment: Valves, pumps, and instrumentation tubing for industrial fluid handling systems
Partner with Us for Your Precision Tube Needs
Whether you need standard off-the-shelf tubes or fully customized solutions for your critical applications, our team of technical and sales experts is ready to support you. We are committed to delivering high-quality, consistent products that optimize your production efficiency and enhance the performance of your end products.
Contact us today to request a quote, order samples, or discuss your specific project requirements.
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