Square and rectangular tubes, also known as equal and unequal-sided steel pipes. They are formed by rolling steel strips after processing. Typically, steel strips are unpacked, leveled, curled, and welded into round tubes, then rolled into square tubes and cut to the required length.

Hot-rolled Seamless Square Pipe, Cold Drawn Seamless Square Pipe, Extruded Seamless Square Pipe, Welded Square Pipe

Among them, the welded square tubes are further divided into:

1. By process: Arc Welded Square Tubes, Resistance Welded Square Tubes (High Frequency, Low Frequency), Gas Welded Square Tubes, Furnace Welded Square Tubes

2. By weld type - Straight seam welded square tube, Spiral seam welded square tube

Material Categories

Carbon steel square tubes, low-alloy square tubes

1. Carbon steel grades include: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc.

2. Low-alloy steel includes: Q345, 16Mn, Q390, ST52-3, etc.

Surface Treatment Categories

Hot-dip galvanized square tubes, electro-galvanized square tubes, oiled square tubes, pickled square tubes.

Application Categories

Decorative square tubes, machine tool square tubes, mechanical industry square tubes, chemical industry square tubes, steel structure square tubes, shipbuilding square tubes, automotive square tubes, steel beam columns square tubes, special purpose square tubes.

Wall thickness classification

Extra-thick wall rectangular tubes, thick wall rectangular tubes, and thin wall rectangular tubes.