Square pipe is a name for square pipe, which is a steel pipe with equal side lengths. It is made of strip steel rolled through process treatment. Generally, the strip steel is unpacked, flattened, curled, and welded into a round tube, which is then rolled into a square tube and then cut to the required length.

Square tubes are divided according to production technology: hot-rolled seamless square tubes, cold-drawn seamless square tubes,

Extruded seamless square tubes and welded square tubes.

Among them, welded square pipes are 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. According to the welding seam, weld the square tube with straight seam and spiral welding.

The square tube can be galvanized for protection to make it more protective and resistant to corrosion.