Seamless square and rectangular tubes are precision-engineered hollow sections designed for high-strength structural and mechanical applications. Unlike welded tubes, seamless tubes are manufactured without any welding joints, ensuring superior uniformity, pressure resistance, and durability. These tubes are made from high-quality carbon steel, alloy steel, or stainless steel, and are widely used in construction, machinery, automotive, shipbuilding, energy, and hydraulic systems.

Welded square and rectangular tubes, also known as welded hollow sections (WHS), are essential structural materials widely used in construction, mechanical manufacturing, automotive engineering, furniture production, and industrial frameworks. These tubes are formed by rolling and welding steel strips or coils into square or rectangular shapes, offering excellent strength, dimensional precision, and cost efficiency. Compared with seamless tubes, welded tubes provide greater flexibility in size customization, lighter weight, and more economical production — making them a preferred choice for structural and decorative applications worldwide.