Explanation

Also known as economic section steel pipe. It includes cross-sectional contours that are non circular, of equal wall thickness, of varying wall thickness, of varying diameter and wall thickness along the length direction, of symmetrical and asymmetric cross-sections. Such as square, rectangular, conical, trapezoidal, spiral tubes, etc. Specially shaped steel pipes are more suitable for the unique usage conditions, saving metal and improving labor productivity in component manufacturing. Widely used in aviation, automobiles, shipbuilding, mining machinery, agricultural machinery, construction, light textile, and boiler manufacturing. Compared with ordinary circular tubes, there are many types and fewer quantities. With the development of the national economy and the progress of the steel pipe industry, more types will continue to emerge. The production methods include cold drawing, cold rolling, electric welding, extrusion, hot rolling, etc. The cold drawing method has been widely used among them. Especially suitable for small-scale production. Compared with other methods, the cold drawing method has a wide adaptability and can produce special-shaped steel pipes with symmetrical and asymmetric sections, as well as variable diameter and spiral pipes. The preparation of the molding tools, equipment, and processes used is relatively simple.

Classification