EN 10255 Non-alloy steel tubes for welding and threading
EN 10255 Non-alloy steel tubes for welding and threading
EN 10255 is a European standard that specifies the technical delivery conditions for non-alloy steel tubes suitable for welding and threading. These tubes are commonly used for conveying fluids, air, and gas in various industrial and construction applications.
| Specification | Details |
| Standard | EN 10255 |
| Material | Non-Alloy Steel |
| Manufacturing Process | Seamless & Welded |
| Size Range | 10mm – 150mm (Nominal Diameter) |
| Wall Thickness | Light, Medium, and Heavy Series |
| End Finish | Plain End (PE), Threaded, or Socketed |
| Surface Coating | Bare, Varnished, Galvanized (Hot-Dip or Electro-Galvanized) |
| Tensile Strength | As per EN 10255 requirements |
| Threading Standard | ISO 7-1 (BSPT), NPT (on request) |
| Lengths | 3m, 6m, or custom-cut lengths |
| Applications | Plumbing, HVAC Systems, Firefighting, Gas & Water Pipelines, Structural Applications |
| Features | High Durability, Corrosion Resistance, Excellent Weldability, Cost-Effective Solution |
EN 10255 Non-alloy steel tubes Dimensions
| Designation of Diameter | O/D | Nominal Wall Thickness | ||||||||||||||
| DIA | SCH 80 S | SCH 80 | SCH 100 | SCH 120 | SCH. 140 | SCH.160 | SCH.XXS | |||||||||
| (A) | (B) | Meter | Wall | Weight Kg/Mtr | Wall | Weight Kg/Mtr | Wall | Weight Kg/Mtr | Wall | Weight Kg/Mtr | Wall | Weight Kg/Mtr | Wall | Weight Kg/Mtr | Wall | Weight Kg/Mtr |
| MM | Thk | Thk | Thk | Thk | Thk | Thk | Thk | |||||||||
| 6 | 1.8 | 10.3 | 2.41 | 0.47 | ||||||||||||
| 8 | 1/4 | 13.7 | 3.02 | 0.82 | ||||||||||||
| 10 | 3/8 | 17.2 | 3.2 | 1.12 | ||||||||||||
| 15 | 1/2 | 21.3 | 3.73 | 1.64 | 4.75 | 1.97 | 7.47 | 2.59 | ||||||||
| 20 | 3/4 | 26.7 | 3.91 | 2.93 | 5.54 | 2.93 | 7.82 | 3.69 | ||||||||
| 25 | 1 | 33.4 | 4.55 | 3.29 | 6.35 | 4.3 | 9.09 | 5.53 | ||||||||
| 32 | 11/4 | 24.2 | 4.85 | 4.53 | 6.35 | 5.69 | 9.7 | 7.88 | ||||||||
| 40 | 11/2 | 48.3 | 5.08 | 5.49 | 7.14 | 7.35 | 10.16 | 9.69 | ||||||||
| 50 | 2 | 60.3 | 5.54 | 7.6 | 8.71 | 11.26 | 11.07 | 13.65 | ||||||||
| 65 | 21/2 | 73 | 7.01 | 11.59 | 9.53 | 15.15 | 14.02 | 20.72 | ||||||||
| 80 | 3 | 88.9 | 7.62 | 15.51 | 11.13 | 21.67 | 15.24 | 28.11 | ||||||||
| 90 | 31/2 | 101.6 | 8.08 | 18.92 | 16.15 | 34.56 | ||||||||||
| 100 | 4 | 114.3 | 8.56 | 22.66 | 11.13 | 28.75 | 13.49 | 34.05 | 17.12 | 41.66 | ||||||
| 125 | 5 | 141.3 | 9.53 | 31.44 | 12.7 | 40.9 | 15.88 | 49.87 | 19.05 | 58.31 | ||||||
| 150 | 6 | 168.3 | 10.97 | 43.21 | 14.27 | 55.03 | 18.24 | 68.53 | 21.95 | 79.1 | ||||||
| 200 | 8 | 219.1 | 12.7 | 65.63 | 15.06 | 76.93 | 18.24 | 91.73 | 20.62 | 102.47 | 23.01 | 112.97 | 22.23 | 108 | ||
| 250 | 10 | 273.1 | 12.7 | 82.8 | 15.06 | 97.27 | 18.24 | 116.38 | 21.41 | 134.9 | 25.4 | 157.51 | 28.58 | 174.95 | 25.4 | 155.5 |
| 300 | 12 | 323.9 | 12.7 | 98.95 | 17.45 | 133.88 | 21.41 | 162.14 | 25.4 | 189.82 | 28.58 | 211.31 | 33.32 | 242.4 | 25.4 | 189.82 |
| 350 | 14 | 355.6 | 12.7 | 109.04 | 19.05 | 160.54 | 23.8 | 197.74 | 27.76 | 227.88 | 31.75 | 257.47 | 35.71 | 286.04 | ||
| 400 | 16 | 406.4 | 12.7 | 125.2 | 21.41 | 206.4 | 26.19 | 249.34 | 30.94 | 290.88 | 36.53 | 338.32 | 40.46 | 370.74 | ||
| 450 | 18 | 457.2 | 12.7 | 141.35 | 23.8 | 258.29 | 29.36 | 314.54 | 34.93 | 369.34 | 39.67 | 414.74 | 45.24 | 466.67 | ||
| 500 | 2C | 508 | 12.7 | 157.51 | 26.19 | 315.97 | 32.54 | 387.41 | 38.1 | 448.3 | 44.45 | 515.94 | 49.99 | 573.31 | ||
| 550 | 22 | 558.8 | 12.7 | 173.66 | 28.57 | 379.7 | 34.92 | 457.83 | 41.27 | 535.17 | 47.62 | 609.3 | 53.97 | 682.57 | ||
| 600 | 24 | 609.6 | 12.7 | 189.82 | 30.94 | 448.3 | 38.89 | 555.76 | 46.02 | 649.44 | 52.37 | 730.72 | 59.51 | 819.7 | ||
| 650 | 26 | 660.4 | 12.7 | 205.97 | (24.66D-t) t | |||||||||||
| 1000 | ||||||||||||||||
| 700 | 28 | 711.2 | 12.7 | 222.13 | Wt/pam + formula | |||||||||||
| 750 | 3C | 762 | 1270 | 238.28 | ||||||||||||
| 800 | 32 | 812.8 | 12.7 | 254.44 | Weight Stainless Steel Pipe | |||||||||||
| 850 | 34 | 863.6 | 12.7 | 270.5 | ||||||||||||
| 900 | 36 | 914.4 | 12.7 | 286.75 | OD (mm) – W.T. (mm) XW.T. (mm) X 0.02466 = Kg. per mtr. | |||||||||||
EN 10255 Chemical Composition
| Element | C (max) | Si (max) | Mn | P (max) | S (max) |
|---|---|---|---|---|---|
| EN 10255 | 0.20 | 0.35 | 0.30-1.20 | 0.035 | 0.030 |
EN 10255 Mechanical Properties
| Property | Value |
| Tensile Strength (MPa) | 320 – 520 |
| Yield Strength (MPa) | ≥ 195 (for ≤ 3mm thickness) |
| Elongation (%) | ≥ 20 |
EN 10255 Physical Properties
| Property | Value |
| Density | 7.85 g/cm³ |
| Melting Point | ~ 1420-1460°C |
| Thermal Conductivity | ~ 50 W/m·K |
| Electrical Resistivity | ~ 0.15 µΩ·m |
Manufacturing Process
1. Raw Material Selection
- High-quality non-alloy carbon steel is used.
- The steel is tested for chemical composition to meet EN 10255 specifications.
2. Forming Process
- Seamless Pipes: Manufactured through hot rolling, where a solid billet is heated and pierced to create a hollow tube.
- Welded Pipes: Cold or hot-rolled steel strips are bent into a cylindrical shape and welded using high-frequency induction welding (HFIW) or submerged arc welding (SAW).
3. Heat Treatment (If Required)
- Pipes may undergo normalizing to refine the grain structure and enhance mechanical properties.
- This process improves toughness, ductility, and strength.
4. Surface Finishing
- Pipes can be supplied in different finishes:
- Black (Uncoated): Without any external coating.
- Galvanized: Hot-dip galvanization for corrosion resistance.
- Varnished: With a protective coating to prevent rust.
5. Threading & End Finishing (If Required)
- Pipes can be threaded at both ends as per EN 10226 standards for easy coupling.
- Ends can be plain, grooved, or beveled based on application needs.
Application
- Plumbing and Water Supply
- Fire Protection Systems
- Gas and Air Transmission
- Construction and Structural Applications
- HVAC and Mechanical Applications
- Oil and Petrochemical Industry
- Agricultural and Irrigation Systems
