Hollow hexagonal steel is widely used in various structural parts, tools and mechanical parts. Compared with round pipes, hexagonal pipes generally have larger moments of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce structural weight and save steel. Hexagonal tubes are also divided into carbon steel hexagonal tubes, hexagonal oxygen blowing tubes, and stainless steel hexagonal tubes according to different processes and materials.Hexagonal steel can be used to form various stress-bearing components according to the different needs of the structure, and can also be used as a connection between components. Widely used in various building structures and engineering structures, such as building beams, bridges, power transmission towers, lifting and transporting machinery, ships, industrial furnaces, reaction towers, container racks and warehouse shelves, etc.The special-shaped pipes are generally distinguished according to the cross section and the overall shape. They can be generally divided into: oval shaped steel pipes, triangular shaped steel pipes, hexagonal shaped steel pipes, diamond shaped steel pipes, stainless steel patterned pipes, stainless steel U-shaped steel pipes, and D-shaped pipes. Pipes, stainless steel elbows, S-shaped pipe elbows, octagonal shaped steel pipes, semi-circular shaped steel rounds, unequal-sided hexagonal shaped steel pipes, five-petal plum shaped shaped steel pipes, double convex shaped steel pipes, double concave shaped steel Stainless steel water trap, melon seed shaped steel pipe, conical shaped steel pipe, corrugated shaped steel pipe.