A seamless square tube is a square-shaped steel pipe with no seams around the circumference. It is made by cold-drawing and extruding seamless steel tubes and is widely used in mechanical structures and fluid transportation fields. Seamless steel pipes have a hollow cross-section and no seam around the circumference. Square tubes are formed by extruding seamless pipes through a mold on all four sides, which is why they are called seamless steel pipes.

Seamless square tubes are made from steel ingots or solid pipe blanks, which are pierced to make rough tubes, and then hot-rolled, cold-rolled, or cold-drawn to make the final product.

The main differences between seamless and welded square tubes are:

1. Different manufacturing processes:

Seamless square tubes are made by cold-drawing seamless steel tubes. Welded square tubes, on the other hand, are made by welding steel plates or steel strips together.

2. Price differences:

Seamless square tubes are usually more expensive than welded square tubes of the same brand and specifications.

3. Performance differences:

During the welding process of the welded square tube, high temperature affects the structure of the metal, which makes its mechanical properties less stable than that of seamless square tubes.

4. Different applications:

Welded square tubes are mainly used in construction, mechanical manufacturing, steel construction projects, shipbuilding, solar power bracket fabrication, steel structure engineering, power engineering, power plants, agriculture and chemical machinery, glass curtain walls, automobile chassis, airports, boiler construction, high-speed road guardrails, and housing construction applications. Seamless square tubes are mainly used in liquid transportation, hydraulic brackets, mechanical structures, medium and low-pressure and high-pressure boiler tubes, heat exchanger tubes, gas, petroleum, and other industries.