Seamless square tubes are divided into hot-rolled seamless square tubes, cold-drawn seamless square tubes, extruded seamless square tubes, and welded square tubes according to the production process. Among them, welded square tubes are divided into: (a) According to the process – arc welded square tubes, resistance welded square tubes (high frequency, low frequency), gas welded square tubes, furnace welded square tubes (b) According to the weld seam – straight seam welded square tubes, spiral welded square tubes

Seamless square tubes are long strips of steel with a hollow section and no seams around them. Steel pipes have a hollow section and are widely used as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, coal gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipes are lighter in weight when the bending and torsional strengths are the same. They are an economical cross-section steel and are widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, and steel scaffolding used in construction. Using steel pipes to manufacture annular parts can improve material utilization, simplify manufacturing processes, save materials and processing time, such as rolling bearing rings, jack sleeves, etc., which are currently widely made of steel pipes. Steel pipes are also indispensable materials for various conventional weapons. Gun barrels and cannon barrels are made of steel pipes. Steel pipes can be divided into round pipes and special-shaped pipes according to the shape of the cross-sectional area. Since the circular area is the largest under the condition of equal circumference, more fluid can be transported by using a round pipe. In addition, the cross-section of the ring is more evenly stressed when subjected to internal or external radial pressure. Therefore, most steel pipes are round pipes. However, round pipes also have certain limitations. For example, under the condition of plane bending, round pipes are not as strong as square and rectangular pipes in bending resistance. Square and rectangular pipes are commonly used in some agricultural machinery frames, steel and wood furniture, etc.

Cherry
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