SR EN 10255 Galvanised pipes made from carbon steel, longitudinal welded, with zinc coating are destined for cold and hot water transport networks, for heating installations (where the pressure does not exceed 50 bars), also for tehnological installations. The superior quality of the used material, allows to estimate a minimum lifespan for the product of 15 years, respecting the proper anticorrosion protection measures.
The exterior and interior surfaces of the pipe must be smooth, without fissures, cracks, overlay of materials, non-metallic inclusions. Small scratches, bumps, dents, a thin layer of welding cinder or traces after clearing defects resulting from the production process are allowed, avoiding wall thickness to fall under the minimal allowed limits. The welding seam needs to be compact and continuous, without fissures or other defects that reduce the rezistence of the seam under the rezistence of the base metal. The exterior ledge of the welding seam is removed. Thickening of the seam within the range of permitted diameter limits is allowed. The interior burr of the welding seam is not removed. Unevenness on the margins of the metal strip in the welding seam is not allowed. Extremities of the pipe must be cut perpendicularly on its' axis. A burr on the pipe ends resulting from the tehnologic process of cutting is allowed. Deformation of pipe ends is not allowed.
Galvanized pipes must have an adherent and continuous layer of zinc on the interior and exterior surface. The covering with zinc of both surfaces or only the inner surface is achieved by submersion in a molten zinc bath. Local roughness and thickening of the zinc layer is allowed, mainly on a portion of 80 mm from the end of the pipe, where the blowing of the tubes is executed. The thickness of the zinc layer on the outer surface must be thinner than the layer of the inner surface. The thickness of the interior surface must be approximately 56 µm. The linear mass of galvanised pipes is calculated by adding the mass of the coresponding minimal thickness of the zinc layer to the mass of the pipes.
The steel sections are not treated after the cold-rolling. On the external and internal surface, there can appear tracks of emulsion, respectively smaller tracks of oxidation. On the external surfaces of the sections there is applied an oil covering, that assures a provisional protection against corrosion. At request one can renounce to this protection covering.
| Diameter Ø (mm) | Thickness (mm) | Weight (kg/m) |
|---|---|---|
| 21.3 | 2.6 | 1.27 |
| 26.9 | 2.6 | 1.63 |
| 33.7 | 3.2 | 2.50 |
| 42.4 | 3.2 | 3.21 |
| 48.3 | 3.2 | 3.69 |
| 60.3 | 3.6 | 5.19 |
| 76.1 | 3.6 | 6.63 |
| 88.9 | 4 | 8.60 |
| 114.3 | 4.5 | 12.5 |
| 139.7 | 4.85 | 16.90 |
| 165.1 | 4.85 | 20.20 |
| 21.3 | 2.3 | 1.14 |
| 26.9 | 2.3 | 1.45 |
| 33.7 | 2.9 | 2.29 |
| 42.4 | 2.9 | 2.93 |
| 48.3 | 2.9 | 3.37 |
| 60.3 | 3.2 | 4.65 |
| 76.1 | 3.2 | 5.94 |
| 88.9 | 3.6 | 7.79 |
| 114.3 | 4 | 11.1 |
| Standard | State | Thickness | Rm N/mm2 | Rp 0,2 | A5 (%) |
|---|---|---|---|---|---|
| SR EN 10255 | S235JR | <16 | 360-510 | 235 | 26 |
| 16-40 | 360-510 | 225 | 26 | ||
| 40-63 | 360-510 | 215 | 25 | ||
| 63-80 | 360-510 | 215 | 24 | ||
| 80-100 | 360-510 | 215 | 24 | ||
| 100-150 | 350-500 | 195 | 22 | ||
| 150-200 | 340-490 | 185 | 21 | ||
| 200-250 | 340-490 | 175 | 21 |
| S235JRH | C | Mn | P | S | N | Cu | CEV |
|---|---|---|---|---|---|---|---|
| max 20 | max 1.4 | max 0.04 | max 0.04 | max 0.012 | max 0.55 | max 0.38 |
The standard size at which these steel profiles are delivered is 6000 mm.
In the case of sheets you can buy whole pieces!
