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Straight seam welded pipes, steel pipes made of hot-rolled or cold-rolled steel plates or steel strip coils welded on welding equipment, are all called straight seam welded pipes. (The name is given b...

Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. It is generally pided into metric electric welded steel pipe, electric welded thin...

What are the weld requirements for straight seam steel pipes? 1. The height of the weld burr of the electric resistance welded steel pipe (ERW pipe) The external burrs of the steel pipe welds should...

Straight seam steel pipes can be pided into high-frequency straight seam steel pipes(ERW) and submerged arc welded straight seam steel pipes (LSAW) according to the production process. The most common...

Annealing process for seamless steel pipes: The seamless annealing of the seamless steel pipe is to heat the hypo-eutectoid steel to 30~50°C above the Ac3 temperature, and to the temperature range of ...

In high-frequency longitudinally welded pipes (ERW welded pipe), the manifestations of cracks include long cracks, local periodic cracks and irregular intermittent cracks. There are also some steel pi...