Main material is 35 crmo, 42 crmo, # 20, 20 g, Q345B, 12 cr1movg, 15 crmo, API 5 l GR. B/X42 X46 / X52 / X60, A333 GR. 1 / GR. 3 / GR. 6, A335 P5 / P9 / P11 / P12 P22 / P91 / P92 steel tubes.
The biggest advantage of large diameter alloy steel tube is that it can be recycled 100%.Seamless steel tubes are divided into hot rolled (extruded) seamless steel tubes and cold drawn (rolled) seamless steel tubes due to their different manufacturing processes.
Cold drawing (rolling) tube is divided into circular tube and special-shaped tube.
Large-diameter Alloy Steel Pipe is mainly used for fertilizer equipment conveying high temperature and high pressure fluid pipeline.Represents material of 20, 16Mn, 12CrMo, 12Cr2Mo, etc.Large diameter alloy steel pipe is defined according to the production material (that is, the material), as the name implies is the alloy made of pipe;And seamless pipe is defined according to the production process (seamless), the difference between seamless pipe is seamless pipe, including straight seam welded pipe and spiral pipe.
Due to its different manufacturing process, it can be divided into hot rolled (extrusion) seamless steel tube and cold drawn (rolling) seamless steel tube.Cold drawing (rolling) tube is divided into circular tube and special-shaped tube.
Hot rolling (extruded seamless steel tube): round tube billet → heating → perforation → three-roll cross rolling, continuous rolling or extrusion → stripping → sizing (or reducing)→ cooling → billet tube → straightening → hydraulic test (or flaw detection)→ marking → storage.
Seamless steel pipe cold drawing (rolling) : round billet - heat - punch to heading, annealing and pickling to apply oil (copper), multi-channel time cold drawing (cold) and billet tube - heat treatment - straightening to hydrostatic test (NDT) - > tag, put in storage.
Large-diameter Alloy Steel Pipe is widely used in automobile, motorcycle, electric vehicle, petrochemical, power load, ship, aerospace, bearing, pneumatic components, medium and low pressure boiler seamless steel tube and other categories, also can be applied to steel sleeve, hydraulic, mechanical processing and other fields!
According to the production method, large-diameter alloy steel pipes can be divided into two categories: hot-rolled seamless steel tubes and hot-rolled seamless steel tubes.Hot-rolled seamless steel tubes are divided into steel tubes, low-medium pressure boiler steel tubes, high-pressure boiler insulation steel tubes, alloy steel tubes, stainless steel tubes, petroleum cracking tubes, geological steel tubes and other steel tubes.Cold rolling (dipper) seamless steel tube in addition to general steel tube, low and medium pressure boiler extrusion steel tube, high pressure boiler steel tube, alloy steel tube, stainless steel tube, oil cracking tube, other steel tubes, also including precision steel tube, carbon thin wall steel tube, alloy thin wall thick wall steel tube, stainless steel thin wall steel tube, special-shaped steel tube.