Explanation

materials products with the same longitudinal shape, hollow cross section and significantly larger length relative to cross section size. The cross section is usually round or square, and there are also trapezoidal, elliptical and various shapes of special section tube. Tube is produced by drawing, rolling, extrusion, piercing and welding. Tube produced by rolling, drawing, extrusion or piercing is called seamless pipe; The tube produced by weld of rolled plates or strips is called welded pipe, which can be divided into straight seam welded pipe and spiral welded pipe according to the shape of weld seam.

Classification