The specifications and models of welded pipes mainly include parameters such as nominal diameter, outer diameter and wall thickness. The common specifications are as follows:
DN15 welded pipe: outer diameter 21.3mm, wall thickness 2.8mm.
DN20 welded pipe: outer diameter 26.8mm or 26.9mm, wall thickness 2.75mm or 2.8mm.
DN25 welded pipe: outer diameter 33.5mm or 33.7mm, wall thickness 3.25mm or 3.2mm.
DN32 welded pipe: outer diameter 42.3mm, wall thickness 3.25mm.
DN40 welded pipe: outer diameter 48mm, wall thickness 3.06mm or 3.5mm.
DN50 welded pipe: outer diameter 60mm, wall thickness 3.32mm or 3.5mm.
DN65 welded pipe: outer diameter 75.5mm or 76.1mm, wall thickness 3.75mm or 4mm.
DN80 welded pipe: outer diameter 88.5mm or 88.9mm, wall thickness 4mm.
DN100 welded pipe: outer diameter 114mm, wall thickness 4mm or 4.5mm.
DN125 welded pipe: outer diameter 140mm, wall thickness 4.5mm.
DN150 welded pipe: outer diameter 165mm, wall thickness 4.5mm.
DN200 welded pipe: outer diameter 219mm, wall thickness 6mm.
Materials and uses of welded pipes
Welded pipes are usually made of steel plates or strips that are welded after curling. Common materials include Q235A, Q235C, etc. Welded pipes have simple production processes, high production efficiency, a wide variety of specifications, and low equipment investment, but their general strength is lower than that of seamless steel pipes.
Implementation Standards
The implementation standard for welded pipes is usually GB/T3091-2008, which is China's national recommended standard and is applicable to general-purpose welded steel pipes.
