S235JR Circular Welded Pipe
Detailed Explanation of S235JR Round Pipe/Welded Pipe
S235JR round welded pipe refers to all steel pipes with a circular cross-section manufactured using S235JR structural steel (strip or plate) as raw material and formed through various welding processes. It adopts the European standard (EN 10025-2) for non-alloy structural steel. Minimum yield strength: 235 MPa. It also possesses good plasticity, toughness, and excellent weldability, which are the foundation for its ability to be manufactured into welded pipes.
Corrosion Protection Treatment of S235JR Round Welded Tube/Pipe
The standard corrosion protection treatment for S235JR round welded pipe is hot-dip galvanizing. This process forms a dense zinc-iron alloy layer on the pipe surface, providing a dual protection mechanism: the zinc layer first acts as a physical barrier to isolate corrosive media, and simultaneously, in the event of coating damage, it continues to protect the substrate through cathodic protection. Welded pipes treated in this way can achieve weather resistance for decades, effectively resisting atmospheric conditions, rainwater, and mild chemical corrosion, fully meeting the long-term service requirements of building structures, outdoor railings, and underground pipe networks.
Process Types of S235JR Circular Welded Pipes/Tube
| Process Type | Welding Method | Key Features | Typical Diameter Range |
|---|---|---|---|
| High-Frequency Resistance Welding (HFW) | High-frequency current heating and pressure | High production efficiency, low cost, high dimensional accuracy, smooth weld seam | Small to medium diameter (Φ20mm - Φ660mm) |
| Spiral Submerged Arc Welding (SSAW) | Spiral coiled submerged arc welding | Can produce large diameters from narrow strips, cost-effective, uniform pressure distribution | Large diameter (Φ300mm - Φ3000mm+) |
| Longitudinal Submerged Arc Welding (LSAW) | Automatic submerged arc welding straight seam | High weld quality, strong pressure-bearing capacity, complex process | Large diameter thick wall (Φ400mm - Φ1600mm+) |
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