Welded Steel Pipe

Welded steel pipe is made from steel plate or steel strip, which is rolled into tube blank and then welded. Compared with seamless steel pipe, it features lower cost, higher production efficiency and prominent advantages for large‑diameter sizes. It is widely used for fluid transportation, steel structures, infrastructure and metallurgical equipment pipelines.

1. Main Types

1. Straight‑Seam Welded Pipe

1. ERW High‑Frequency Electric‑Resistance Welded Pipe ‑ Process: High‑frequency resistance welding without filler wire; main product for small and medium diameters ‑ Outer diameter: DN15‑DN600 ‑ Features: High dimensional accuracy, large output, cost‑effective ‑ Application: Water supply & drainage, gas, steel structures, mechanical protective pipes, low‑pressure fluid
2. LSAW Longitudinal Submerged‑Arc Welded Pipe ‑ Process: Steel plate bent and formed, double‑sided submerged‑arc welding ‑ Outer diameter: DN400‑DN1500, heavy‑wall available ‑ Features: High weld quality, good pressure resistance ‑ Application: Medium‑&‑high‑pressure pipelines, oil & gas, heavy‑industry projects

2. SSAW Spiral‑Seam Welded Pipe

‑ Process: Steel strip spiral forming, double‑sided submerged‑arc welding with spiral weld seam ‑ Outer diameter: DN200‑DN3600, excellent cost advantage for extra‑large diameter ‑ Features: Dispersed weld stress; longer total weld length ‑ Application: Large‑diameter water & oil transmission, municipal pipelines, pile foundation, large‑scale steel structures

Details