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EN 10305-1 is a European standard on the technical delivery conditions of precision steel pipes, which details the technical requirements for seamless cold-drawn steel pipes.
Honing is a finishing method used to improve the internal surface finish and accuracy of steel pipes.
C35E cold drawn steel pipe has high precision, high smoothness and excellent mechanical properties, and is suitable for applications that require high inner surface quality and mechanical properties of steel pipes.
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EN 10305-1 C35E Honed Seamless Steel Tube
Standard: EN 10305-1, EN 10305-4
Materials:C35E
Technical: cold-drawn seamless
Delivery Condition:BK.BKW,BK+S,GBK,NBK
Straightness: 0.5mm/1m max for tubes below 3m,0.8mm/1m max for tubes between 3 to 6m, 1.2mm/1m for tubes above 6m
Technology: honed & SRB(Skived and Roller Burnished).
Application: used in the hydraulic cylinder of the Heavy Machinery, Cranes, Excavator, and Forklifts. etc
Chemical composition
| C | Si | Mn | Ni | P | S | Cr | Mo |
| 0.32 - 0.39 | max 0.4 | 0.5 - 0.8 | max 0.4 | max 0.045 | max 0.045 | max 0.4 | max 0.1 |
Mechanical properties
| Nominal thickness (mm): | to 16 | 16 - 100 | 100 - 250 | 250 - 500 | 500 - 1000 |
| Rm - Tensile strength (MPa) (+N) | 550 | 520 | 500 | 480 | 470 |
Products Application Areas
Hydraulic and Pneumatic Systems:
Hydraulic and Pneumatic Cylinders: Honed inner bores ensure sealing and reduce leakage risk.
Examples: Hydraulic actuators in construction machinery and injection molding machines.
Automotive Industry:
Shock Absorber Tubes: High-precision inner bores ensure smooth piston movement.
Steering Systems: Serving as the base material for steering gear tie rods or gear shafts.
Precision Machinery:
Bearing Rings, Needle Roller Bearing Outer Rollers: Dimensional stability directly affects rotational accuracy.
Guide Sleeves, Mechanical Shafts: Reduces secondary machining after assembly.
Products Description
1. What is EN 10305-1 C35E Honed Seamless Steel Tube, and what makes it "high-quality"?
EN 10305-1 C35E is a cold-drawn seamless precision steel tube manufactured to European standards, specifically designed for high-accuracy mechanical applications. The "high-quality" designation stems from:
Tight Dimensional Tolerances: Achieved through cold-drawing, ensuring consistent outer diameter (OD) and wall thickness (WT) precision (e.g., h8/h9 for OD, ±5% WT tolerance).
Honed Inner Surface: The inner bore is polished to a mirror-like finish (Ra ≤ 0.4 μm), reducing friction and wear in hydraulic/pneumatic systems.
Material Purity: Strict control over chemical composition (C: 0.32–0.39%, Mn: 0.5–0.8%, P/S ≤ 0.035%) minimizes impurities, enhancing durability.
Heat Treatment: Delivered in normalized (+N) condition for optimal balance of strength (520–550 MPa tensile) and ductility (≥19% elongation).
2. What are the key applications for this product?
This tube excels in applications requiring precision, durability, and corrosion resistance:
Hydraulic & Pneumatic Systems: Cylinder tubes, shock absorbers, and valve components.
Automotive Industry: Steering system rods, suspension parts, and gear shafts.
Precision Machinery: Bearing sleeves, linear guide rails, and robotic arm components.
Industrial Equipment: Conveyor rollers, printing press cylinders, and textile machinery parts.
3. How does C35E compare to other steel grades (e.g., E235, 1045)?
| Grade | Carbon Content | Strength (MPa) | Hardness | Best For |
|---|---|---|---|---|
| C35E | 0.32–0.39% | 520–550 | Medium | High-load mechanical parts |
| E235 | 0.16–0.22% | 360–480 | Soft | Low-stress structural components |
| 1045 | 0.42–0.50% | 570–670 | Hard | Heavy-duty gears/shafts |
| C35E offers a balanced performance-stronger than E235 but more ductile than 1045, making it ideal for applications needing both strength and machinability. |
4. What surface treatments are available to enhance durability?
We offer customized surface finishes to meet specific environmental demands:
Phosphating: Improves paint adhesion and corrosion resistance (ideal for outdoor machinery).
Galvanizing (Zinc Coating): Provides long-term protection against rust (recommended for marine/coastal applications).
Internal Coating: PTFE or chrome plating reduces friction and extends service life in hydraulic systems.
Oil Dipping: Temporary rust prevention during storage/transport.
5. How do you ensure dimensional accuracy and surface quality?
Our quality control process includes:
In-Line Inspection: Laser gauges monitor OD/WT during cold-drawing.
Honing Verification: Profilometers check inner surface roughness (Ra ≤ 0.4 μm).
Non-Destructive Testing (NDT): Ultrasonic testing detects internal defects.
Certification: Each batch includes EN 10204 3.1 material certificates with chemical/mechanical test reports.
6. What is the minimum order quantity (MOQ), and can you supply custom lengths/sizes?
MOQ: Typically 500 meters per size, but flexible for recurring orders.
Customization: We offer cut-to-length services (6–12m standard) and non-standard diameters/wall thicknesses (subject to tooling feasibility).
Packaging: Bundled with plastic caps and VCI paper to prevent corrosion during transit.
7. How quickly can you deliver orders, and which regions do you serve?
Lead Time: 3–4 weeks for standard sizes (expedited options available).
Global Coverage: Direct shipments to North America, Europe, Asia, and Latin America via sea/air freight.
Stock Programs: Partner warehouses in Germany, USA, and China for just-in-time deliveries.
8. Do you provide technical support for component design?
Absolutely! Our engineering team offers:
Material Selection Guidance: Matching grade properties to application loads.
Tolerance Optimization: Advising on cost-effective OD/WT combinations.
Failure Analysis: Root-cause diagnosis for premature wear or cracking.
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