Torque tube Concept and classification of

Rectangular tube is a kind of light thin-walled steel tube with hollow square section, also known as steel cold-formed section. It is a shape steel with square section and overall dimension made of Q235 hot-rolled or cold-rolled strip or coil as the base material after cold bending and forming and then high-frequency welding. Hot rolled extra thick wall square tube is in the condition of wall thickening, and its corner size and edge straightness reach or exceed the degree of resistance welding cold formed square tube.

Classification of rectangular pipes: steel pipes are divided into seamless steel pipes and welded steel pipes (seamless pipes), hot rolled Seamless square tube Cold drawn seamless square tube, extruded seamless square tube, welded square tube.

The welded square pipe is divided into:

1. According to the process: arc welding square tube, resistance welding square tube (high-frequency, low-frequency), gas welding square tube, furnace welding square tube;

2. It is divided into straight seam welded square tube and spiral welded square tube according to weld seam.