Why Choose Baokun?
BAOKUN is your trusted partner of high precision EN 10305 seamless steel tubes, recognized for its commitment to quality and customer satisfaction. With a focus on advanced production techniques and strict adherence to industry standards, Baokun provides precision-engineered tubes for a variety of demanding applications
- Competitive Pricing: Offering affordable prices from direct manufacturer.
- OEM Custom: Tailored specification to meet your project needs.
- Fast Delivery: 5-7 days for in-stock items, 30-45 days for custom orders.
- 24/7 After-Sales Support: Dedicated team available to assist with any questions or concerns.
- Refund & Replacement: Assurance of quality with a refund or replacement for faulty products.
- Strict Quality Control: Rigorous testing and adherence to DIN EN 10305 standards to ensure reliability and performance.
FAQs
1. What is EN 10305?
EN 10305 is a European standard for precision steel tubes. These tubes are cold-drawn (shaped at room temperature), ensuring smooth surfaces, tight size tolerances, and strength.
2. What is EN 10305-4 Material?
EN 10305-4 defines materials for hydraulic and pneumatic systems (like car brakes or factory machines). These tubes handle high pressure and need to be leak-proof.
Grades: E215, E235, E255, and E355. E235 is the most common.
Key features:
- Smooth inner surfaces to prevent seal damage.
- High strength (350–480 MPa tensile strength for E235).
- Tested for safety (hydrostatic pressure, flaring).
3. What is the Chemical Composition of EN 10305?
The chemical makeup varies by grade and part of the standard. Below are examples for EN 10305-4’s E235 and E355 grades:
| Grade | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|---|
| E235 | ≤0.17% | ≤0.35% | ≤1.20% | ≤0.025% | ≤0.015% |
| E355 | ≤0.20% | ≤0.55% | ≤1.60% | ≤0.025% | ≤0.015% |
Aluminum is often added to improve strength. Higher grades like E355 have more carbon and manganese.
4. What’s the Difference between ISO abd EN Standard?
AEN standards align with EU laws, while ISO standards are used worldwide. Many EN standards match ISO rules but include extra EU-specific requirements.
5. What’s the Difference between EN 10305-1 and EN 10305-4?
| Feature | EN 10305-1 | EN 10305-4 |
|---|---|---|
| Applications | General machinery | Hydraulic systems |
| Grades | E215, E235, E355 | Adds E255 |
| Surface Finish | Smooth but less strict | Ultra-smooth inner walls |
| Testing | Basic pressure tests | Extra flaring/seal tests |
| Tolerance | Slightly looser | Tighter dimensions |
EN 10305-1 serves general precision engineering with broader material and tolerance flexibility, while EN 10305-4 is specialized for hydraulic/pneumatic systems with stricter mechanical, dimensional, and surface requirements. The inclusion of E255 grade and impact energy specifications further distinguishes EN 10305-4 for high-stress fluid applications.
