AdminSquare tube production process including hot rolling and cold drawing of two kinds: 1. Hot rolled square tube general steel pipe, low and medium pressure boiler pipe, high pressure boiler tube, alloy steel, stainless steel pipe, oil cracking pipe, geological steel pipe and other steel pipe and so on. Hot-rolled steel pipe with hot rolled or heat treatment state delivery; Hot rolled square tube production process: from tube billet heating to perforated – three-roll skew rolling, rolling, pipe – sizing – cooling – straightening – hydrostatic test to tag, warehousing, rolling square pipe raw material is round billet, round tube embryo through cutting machine cutting the growth degree of about 1 meter of the billet, and the conveyor belt to the heating furnace. Are fed into the furnace tube billet heated to about 1200 degrees Celsius. Heating tube for hydrogen fuel or acetylene. In furnace temperature control is a crucial problem, tube billet after go through punch for punch. General is one of the more common punch is tapered roller wear steel pipe hole machine, the punching machine production efficiency is high, products of good quality and large amount of perforated hole enlargement, can wear a variety of steel grade. After perforation, tube billet has been three-roll skew rolling, rolling. To take off after extruding tube sizing. Sizing mill by taper drill bits high-speed steel into embryo punching and forming steel pipe (steel pipe diameter by sizing mill bit diameter length to determine). Steel pipe after sizing, into the cooling tower, by water spray cooling, steel pipe after cooling, will be straightening. Steel pipe after straightening the internal inspection by the conveyor belt to the metal detection machine, if steel pipe internal crack, air bubble, will be detected. Steel pipe after inspection through rigorous manual pick. Sprayed with paint after steel pipe quality, number, specification, batch number, etc. And by crane into the warehouse. 2. Cold dial square tube in addition to general steel tube, low medium pressure boiler pipe, high pressure boiler tube, alloy steel, stainless steel pipe, oil cracking pipe, steel pipe, other include carbon thin wall steel tube, alloy thin wall steel pipes, thin-walled stainless steel pipe, steel pipe. Cold rolled to heat treatment state delivery. Cold drawn square tube production process: from tube billet heating to punch to heading, annealing, pickling – oil – multi-channel time cold drawn to billet tube – heat treatment – straightening, hydrostatic test – > tag to put in storage. Cold drawn square tube rolling method of the hot rolled complex, their production process first three steps are basically the same. The difference from the fourth step, circular tube billet after punch, heading, annealing. After annealing to use special acid pickling liquid. After acid pickling, oil. And then followed by cold drawn through multi-channel time. After heat treatment, will be straightening. Steel pipe after straightening the internal inspection by the conveyor belt to the metal detection machine, if steel pipe internal crack, air bubble equivalent problem will also be singled out. From her appearance, cold drawn Steel square tube length is shorter in hot rolled square tube. Wall thickness in cold drawn square tube than hot rolled square tube evenly, hot-rolled tube of low accuracy, surface roughness, and high precision cold drawn pipe, the surface roughness or some. youtube video downloader