Bos Hydraulic's DIN EN 10305 steel tubes represent the pinnacle of precision-engineered seamless tubing, manufactured through advanced cold-drawing processes to achieve exceptional dimensional accuracy and superior surface quality. These high-precision tubes maintain strict inner and outer diameter tolerances within 0.2mm while delivering optimal bending and torsional strength characteristics.
Specifications of EN 10305 Seamless Cold Drawn Tubes
| Size: | OD: 6mm-114mm |
| WT: 0.5mm – 40mm | |
| LENGTH: 5.8/6/11.8/12m | |
| Material | C20, CK45, E355, ST52, SAE1020 |
| Heat Treatment | NBK(+N) GBK(+A) BK(+C) BKW(+LC) BKS(+SR) |
| Grade | Chemical Composition% | ||||
| C | Si | Mn | P | S | |
| SAE1020 | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 |
| SAE1045 | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 |
| SKTM13C-T(25Mn) | 0.22-0.29 | 0.17-0.37 | 0.70-1.00 | 0.035 | 0.035 |
| 27SiMn | 0.24-0.32 | 1.10-1.40 | 1.10-1.40 | 0.035 | 0.035 |
| E355 | ≤0.22 | ≤0.55 | ≤1.6 | 0.025 | 0.025 |
| Q345B | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.03 | 0.03 |
| Q345D | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.03 | 0.03 |
| SAE1026 | 0.22-0.28 | 0.15-0.35 | 0.60-0.90 | 0.04 | 0.05 |
| Delivery condition | Bos Hydraulic | Bos | |||
| Cold Drawn & Stress-Relieved | Cold finished | ||||
| Steel Grade | Rm MPa | ReH MPa | Elongation A5(%) | Rm MPa | Elongation A5(%) |
| ST45 | ≥520 | ≥375 | ≥15 | ≥550 | ≥5 |
| ST52(E355) | ≥600 | ≥520 | ≥14 | ≥640 | ≥5 |
| SAE1026 | ≥600 | ≥510 | ≥15 | ≥640 | ≥5 |
| SAE1045 | ≥600 | ≥520 | ≥10 | ≥640 | ≥5 |
| SAE1020 | ≥520 | ≥375 | ≥15 | ≥550 | ≥8 |
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% |
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.
What is 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 |
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