EN10305 Seamless Steel Tube / EN 10305-2 / EN 10305-3 ERW Steel Tubes for Telescopic Hydraulic Cylinders – Precision Steel Tubing by Womic Steel Group
Womic Steel Group is a leading manufacturer and supplier of precision steel tubes in compliance with EN10305 Seamless Steel Tube, EN 10305-2 and EN 10305-3 standards for welded steel tubes, specifically engineered for telescopic hydraulic cylinders used in automotive, lifting, and construction applications. Our high-precision cold-drawn welded tubes offer exceptional dimensional control, surface finish, and mechanical strength — essential for seamless operation and durability in hydraulic systems.
What are EN10305-1/ EN 10305-2 / EN 10305-3 Steel Tubes?
EN 10305 is a European standard that covers precision steel tubes.
EN10305 Consists of the following parts under the general title:
EN10305 Standards Steel tubes for precision applications.
Technical delivery conditions of Precision steel pipes DIN EN 10305:
Part 1: Seamless cold drawn tubes.—Automotive, mechanical engineering
Part 2: Welded cold drawn tubes.—Automotive, mechanical engineering
Part 3: Welded cold sized tubes.—Automotive, mechanical and plant engineering
Part 4: Seamless cold drawn tubes for hydraulic and pneumatic power systems.—Hydraulic and pneumatic power systems
Part 5: Welded and cold sized square and rectangular tubes.—Automotive, mechanical and plant engineering
Part 6: Welded cold drawn tubes for hydraulic and pneumatic power systems.
EN10305-1 Seamless Cold Drawn Tubes
Grade E215, E235, E355
EN10305-1 E215, E235, E355 is the standard applicable to seamless cold drawn tubes
EN 10305-2 refers to cold drawn welded (CDW) tubes with high precision and enhanced surface finish.
EN 10305-3 focuses on welded cold-sized tubes with tight dimensional tolerances and surface quality.
These tubes are manufactured using Seamless or Electric Resistance Welding (ERW) and undergo subsequent cold drawing and sizing, ensuring consistent inner and outer diameters, which is crucial for hydraulic cylinder assembly.
Delivery Conditions for EN 10305 steel tubes.
The tubes shall be manufactured from hot finished seamless tubes by cold drawing or other suitable processes. The tubes shall be supplied in one of the delivery conditions as follows:
Designation and Symbols (EN 10305)
| Designation | Symbol | Description |
| Cold drawn/hard | +C | No heat treatment after the final cold drawing process. |
| Cold drawn/soft | +LC | After the final heat treatment there is a suitable drawing pass. |
| Cold drawn and stress relieved | +SR | After the final cold drawing process there is a stress relief heat treatment in a controlled atmosphere. |
| Annealed | +A | After the final cold drawing process the tubes are annealed in a controlled atmosphere. |
| Normalized | +N | After the final cold drawing operation, the tubes are normalized in a controlled atmosphere. |
Delivery Condition Symbol Comparison: EN 10305 vs DIN 2391
| EN 10305 Symbol | DIN 2391 Symbol |
| +C | BK |
| +LC | BKW |
| +SR | BKS |
| +A | GBK |
| +N | NBK |
EN 10305-2 / EN 10305-3 ERW Tubes Chemical Composition
EN 10305-3 ERW Tubes – Chemical Composition
| Steel Grade | Steel Number | C (max %) | Si (max %) | Mn (max %) | P (max %) | S (max %) |
| E215 | 1.0212 | 0.10 | 0.05 | 0.70 | 0.025 | 0.015 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.025 | 0.015 |
| E355 | 1.0580 | 0.22 | 0.55 | 1.60 | 0.025 | 0.015 |
EN 10305-2 ERW Tubes – Chemical Composition
| Steel Grade | Steel Number | C (max %) | Si (max %) | Mn (max %) | P (max %) | S (max %) |
| E155 | 1.0033 | 0.11 | 0.35 | 0.70 | 0.025 | 0.025 |
| E195 | 1.0034 | 0.15 | 0.35 | 0.70 | 0.025 | 0.025 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.025 | 0.025 |
| E275 | 1.0225 | 0.21 | 0.35 | 1.40 | 0.025 | 0.025 |
| E355 | 1.0580 | 0.22 | 0.55 | 1.60 | 0.025 | 0.025 |
EN 10305-2 / EN 10305-3 ERW Tubes Mechanical Properties
Carbon EN 10305-3 ERW Tube Mechanical Properties
| Steel Grade Symbol | Yield Limit ReH Min. MPa | Tensile Strength Rm Min. MPa | Elongation A Min % |
| E215 | 215 | 290 to 430 | 30 |
| E235 | 235 | 235 to 480 | 25 |
| E355 | 355 | 490 to 630 | 22 |
EN 10305-2 ERW Tubes Mechanical & Physical Properties
| Steel Grade | Cold Drawn Hard | Cold Drawn Soft | Cold Drawn & Stress Relieved | Annealed | Normalised | Rm, Mpa (N/mm2) | A, % |
| E155 | 400 | 6 | 350 | 10 | 350 | 245 | 18 |
| E195 | 420 | 6 | 370 | 10 | 370 | 260 | 18 |
| E235 | 490 | 6 | 440 | 10 | 440 | 325 | 14 |
| E275 | 560 | 6 | 510 | 8 | 510 | 375 | 12 |
| E355 | 640 | 4 | 590 | 6 | 590 | 435 | 10 |
Why Choose EN 10305 ERW Tubes for Telescopic Hydraulic Cylinders?
Hydraulic telescopic cylinders require tubes with:
Excellent concentricity for piston alignment
Smooth internal surfaces to reduce friction and wear
Tight dimensional tolerances to ensure seal integrity and high-pressure performance
Uniform wall thickness to handle dynamic pressure cycles
Womic’s EN 10305 ERW tubes meet these criteria with precision engineering and advanced inspection.
Dimensional Tolerances According to EN 10305-2 / EN 10305-3
EN 10305 Standard – Tolerances for Precision Steel Tubes
Dimensional Tolerances According to EN 10305
| Item | Requirement | Description |
| Outer Diameter Tolerance (OD) | ±0.08 mm (D ≤ 30 mm) ±0.15 mm (D > 30 mm) |
Depending on size and cold-drawn condition. EN 10305-2 offers higher precision. |
| Wall Thickness Tolerance (WT) | ±10% (EN 10305-2) ±15% (EN 10305-3) |
Based on nominal wall thickness. Cold drawn tubes are more accurate. |
| Ovality | ≤ 50% of OD tolerance | Ovality must not exceed half of OD tolerance. |
| Straightness | ≤ 0.3 mm per 1000 mm | Maximum deviation allowed over tube length. |
| Surface Roughness (Ra) | Ra ≤ 4 μm (standard) Ra ≤ 1.6 μm (on request) |
Smooth inner and outer surfaces, suitable for hydraulic systems. |
| Eccentricity | ≤ 10% (WT/OD) | Eccentricity impacts force balance in hydraulic systems. |
These precise tolerances guarantee interchangeability, leak-proof performance, and longer service life in hydraulic applications.
Material Grades Available, or other also can be supplied.
EN 10305-2 / 3 E215
EN 10305-2 / 3 E235
EN 10305-2 / 3 E355
These grades are selected based on the required mechanical properties, formability, and pressure endurance. Womic ensures all tubes meet the Yield Strength, Tensile Strength, and Elongation parameters as per EN standards.
Applications in Telescopic Hydraulic Cylinders
Hydraulic cylinders for dump trucks, cranes, and agricultural equipment
Piston and sleeve systems requiring tight sliding fit
Applications requiring light weight, high strength, and fatigue resistance
Quality Control and Testing
Womic Steel Group conducts rigorous inspection on each tube batch:
Dimensional Testing (OD, WT, concentricity)
Hydrostatic & Eddy Current Testing
Tensile and Hardness Testing
Surface Roughness & Straightness Measurement
Microstructure & Metallographic Analysis
We ensure that every tube conforms to or exceeds EN 10305 standards and client-specific requirements.
Why Womic Steel Group?
✅ In-house Production Control – From slitting to drawing, all processes are monitored.
✅ Customized Sizes and Lengths – Available up to 6 meters or as per customer requirement.
✅ Fast Delivery and Global Export – Warehouses in China.
✅ Expertise in Hydraulic Tube Applications – Supported by decades of experience in fluid power systems.
Contact Us for Best Price and Immediate Stock Availability
Womic Steel Group is your reliable supplier for:
EN 10305-2 Cold Drawn Welded Tubes
EN 10305-3 Cold-Sized ERW Tubes
Precision Tubes for Telescopic Hydraulic Cylinders
Email: sales@womicsteel.com
Website: www.womicsteel.com
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Let Womic Steel Group be your precision partner in hydraulic solutions.
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Post time: Jun-23-2025