Welded square tube is a square cross-section steel tube formed by cold bending of steel plates or steel strips and then welding. It has the characteristics of stable structure, flexible processing and moderate cost. It is widely used in construction, machinery, transportation, furniture and other fields.

Welded Steel Pipe is a steel pipe made by welding steel plates or steel strips after curling and forming. It is widely used in industry, construction, energy, transportation and other fields.