Seamless tubes for structures are seamless tubes for general construction and mechanical construction. Seamless steel tube is divided into a variety of different uses.
Structure for seamless pipe is widely used in chemical, petroleum, hot-rolled stainless steel made of textile, medical, food, machinery and other industrial anti-corrosion pipes and structural parts and parts of the (extrusion, expansion) and cold drawing (rolling) seamless pipe.
GB/T8162-2008 (structural seamless pipe) is mainly used for general structure and mechanical structure. The representative of material (trademark): carbon steel 20, 45 steel, Q235 steel, Q345, 20Cr, 40Cr alloy, 20CrMo, 30-35CrMo, 42CrMo etc..
Seamless pipe structure for its production technology, divided into hot-rolled seamless steel tube (Rou Nie) and cold drawing (rolling) seamless steel tube two. Cold drawing (rolling) tube is divided into two kinds of circular shaped tube.
A. (hot rolled seamless steel tube billet, kneading): heating, perforation, three roll cross rolling, rolling, kneading, or tube sizing pipe (or reducing) - cooling - tube, straightening, hydrostatic test (or testing), symbols and warehousing.
B. cold drawing (rolling) seamless steel pipe: round tube to heating to perforation, annealing, pickling, leading to oil (copper), multi pass drawing (Leng Zha) heat treating, straightening, hydrostatic test, blank tube, (testing), symbols and warehousing.