1. Manufacturing process
Seamless square tubes are made through a series of seamless processes such as perforation and tube rolling, and there is no weld as a whole. Ordinary square tubes are made by welding the strip steel after curling and forming, and there are obvious welds.

2. Performance
Seamless square tubes have higher pressure resistance and better sealing, because they do not have the weak link of welds, and can withstand higher pressure and a more complex working environment. In contrast, there may be a certain risk of leakage at the welds of ordinary square tubes, and the pressure resistance is relatively weak.

3. Material
The material of seamless square tubes is usually more uniform and has relatively fewer impurities, so it has better mechanical properties and chemical stability. The material uniformity of ordinary square tubes may be affected by the welding process.

4. Application field
Seamless square tubes are often used in occasions with high requirements for sealing and pressure resistance, such as petrochemical, aerospace, high-pressure boilers, and other fields. Ordinary square tubes are more used in general engineering fields such as building structures, machinery manufacturing, and furniture manufacturing.

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