According to the production method can be divided into seamless pipe and welded pipe. Seamless steel tube manufacturing process Tube billet heating - inspection - skin - - - perforation, pickling, grinding, dry lubrication, welding head, cold drawing, solid solution treatment, pickling, pickling passivation - inspection Welding steel tube manufacturing process Strip -- inspection -- shearing -- fixed length -- qualitative -- welding -- grinding (seamless) -- fixed length -- inspection Seamless steel tube material 10#, 20#, 35#, 45#, 16Mn, 27SIMn, 20G, 40Cr, etc Welded steel tube material Q195A, Q215A, Q235A, Q345A, etc
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Seamless steel pipe is perforated by the whole round steel, the surface of no weld steel pipe, known as seamless steel pipe. According to the production method, seamless steel tubes can be divided into hot-rolled seamless steel tubes, cold-rolled seamless steel tubes, cold-drawn seamless steel tubes, extruded seamless steel tubes, pipe jacking, etc. According to the shape of the section, the seamless steel tube is divided into two kinds: round and special-shaped. The special-shaped tube has a variety of complex shapes, such as square, oval, triangle, hexagonal, melon seed, star and finned tube. The maximum diameter is up to 900mm and the minimum diameter is 4mm. According to the different USES, there are thick wall seamless steel tube and thin wall seamless steel tube. Seamless steel tubes are mainly used for petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler and furnace pipes, bearing pipes and high-precision structural steel pipes for automobile, tractor and aviation.
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Manufacturing process: welded elliptical steel tube is made of steel plate, which is directly welded and formed after winding. The seamless elliptical steel tube is secondary shaped by pickling phosphating die. Welded elliptical steel tubes are mainly used in steel structure construction, such as bridge handrails, stair handrails, steel structure columns of large buildings and so on. Seamless elliptic steel tubes are mainly used for fluid transport, such as water, gas, steam, oil, oil and gas pipelines.
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Stainless steel industrial pipe is divided into: 304L stainless steel industrial pipe, 304 stainless steel industrial pipe, 310 stainless steel industrial pipe, 303 stainless steel industrial pipe, 302 stainless steel industrial pipe, 301 stainless steel industrial pipe, 202 stainless steel industrial pipe, 201 stainless steel industrial pipe, 410 stainless steel industrial pipe, 420 stainless steel industrial pipe, 430 stainless steel industrial pipe, etc
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Spiral pipe, also known as spiral pipe or spiral welded pipe, is a low carbon structural steel or low alloy structural steel strip according to a certain helix Angle (called forming Angle) rolled into a blank, and then welded pipe joints made, it can be used to produce large diameter steel pipe with narrow strip. Spiral pipe is mainly used for oil and natural gas transmission pipelines, and its specification is expressed by outer diameter * wall thickness. Spiral pipe has single side welding and double side welding. The welded pipe shall meet the requirements of hydrostatic test, tensile strength of weld and cold bending performance
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Shaped tubes are made of all kinds of shaped seamless steel tubes by cold drawing. Special-shaped pipe is generally divided according to the broken section, according to the material can be divided into seamless steel tube, aluminum alloy special-shaped pipe, plastic special-shaped pipe.
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Hot dip galvanizing tube is an alloy layer produced by the reaction of the molten metal with the iron matrix, so that the matrix and the coating are combined. Hot-dip galvanizing involves pickling the steel pipe first. To remove the iron oxide on the surface of the steel pipe, after pickling, the steel pipe is cleaned through the aqueous solution of ammonium chloride or zinc chloride or the aqueous solution of ammonium chloride and zinc chloride mixed, and then sent to the hot-dip plating bath. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.
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Hot dip galvanizing tube is an alloy layer produced by the reaction of the molten metal with the iron matrix, so that the matrix and the coating are combined. Hot-dip galvanizing involves pickling the steel pipe first. To remove the iron oxide on the surface of the steel pipe, after pickling, the steel pipe is cleaned through the aqueous solution of ammonium chloride or zinc chloride or the aqueous solution of ammonium chloride and zinc chloride mixed, and then sent to the hot-dip plating bath. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.
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Galvanized steel pipes are welded steel pipes with hot-dip galvanized or electro-galvanized layers on the surface. Galvanizing can increase the corrosion resistance of the steel pipe and prolong the service life. Galvanized pipes have a wide range of uses. In addition to line pipes for conveying water, gas, oil and other general low-pressure fluids, they are also used as oil well pipes and oil pipes in the petroleum industry, especially offshore oilfields, as well as oil heaters and condensate for chemical coking equipment. Pipes for coolers, coal-distilled wash oil exchangers, pipe piles for trestle bridges, and pipes for support frames in mine tunnels
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