Square rectangular pipe is a term for square and rectangular pipes, which refers to steel pipes with equal or unequal side lengths. It is rolled from strip steel through process processing. Generally, the strip steel is unpacked, flattened, curled, and welded into circular tubes, which are then rolled into square tubes and cut to the required length.

Square and rectangular tubes are divided into hot-rolled seamless square tubes, cold drawn seamless square tubes, extruded seamless square tubes, and welded square tubes according to production processes.

The welded square tube is further divided into:

1. Divided by process - arc welded square tube, resistance welded square tube (high-frequency, low-frequency), gas welded square tube, furnace welded square tube

2. Divided by weld seam - straight seam welded square tube, spiral welded square tube.

Material classification:

Square tubes are classified by material: plain carbon steel square tubes, low-alloy square tubes.

1. Ordinary carbon steel is divided into Q195, Q215, Q235, SS400, 20 # steel, 45 # steel, etc.

2. Low alloy steel is divided into Q345, 16Mn, Q390, ST52-3, etc.

Application areas: Widely used in mechanical manufacturing, construction industry, metallurgical industry, agricultural vehicles, agricultural greenhouses, automotive industry, railways, highway guardrails, container frames, furniture, decoration, and steel structure fields.

Used in engineering construction, glass curtain walls, door and window decoration, steel structures, guardrails, machinery manufacturing, automobile manufacturing, home appliance manufacturing, shipbuilding, container manufacturing, electricity, agricultural construction, agricultural greenhouses, bicycle racks, motorcycle racks, shelves, fitness equipment, leisure and tourism products, steel furniture, various specifications of oil casings, oil pipes and pipeline pipes, fluid transportation such as water, gas, sewage, air, heating, fire protection and support, construction industry, etc.