Introduction to Special Shape Steel PipesFor economic sectionSteel pipe. Including cross-sectional profiles that are not circular, such as equal wall thickness, variable wall thickness, varying diameter and wall thickness along the length, and both symmetrical and asymmetrical cross-sections. Such as square, rectangular, conical, trapezoidal, and helical shapes. Special-shaped steel tubes can better adapt to the specific conditions of use, save metal, and improve the labor productivity of component manufacturing. They are widely used in aviation, automotive, shipbuilding, mining machinery, agricultural machinery, construction, light industry and textiles, and boiler manufacturing. The methods of producing special-shaped tubes include cold drawing, electric welding, extrusion, and hot rolling, among which cold drawing is applied more widely.