What are the differences between seamless pipe and welded steel pipe?

The differences between seamless steel pipe and welded steel pipe

1.In application

Seamless pipes can be used for liquid flow pipes and pressure parts above 0.8MRa; welded pipes can only be used for liquid flow pipes and structural pipes below 0.8MRa.

2.In production process

Seamless pipes are perforated and extruded from billets; welded pipes are welded from strip steel.

3.In price

The seamless pipe is high; the welded pipe is low. The seamless pipe is higher than the welded pipe by 1500-2000 yuan/ton.

4.Naming in size

The seamless pipe is marked directly, such as Φ32X2.5, which indicates the diameter is 32, and the wall thickness is 2.5; the welded pipe is marked with the nominal diameter (nominal size) "DNXX", such as DN32, the diameter is 42.4, and the wall thickness is 2.75-3.94.