Structure with seamless steel tubes
1, overview: the product has high strength, high pressure, easy installation, low cost, long service life, and many other advantages.
2, detailed instructions:

20 seamless steel tube is made from solid tube ingot or the perforation capillary, then through hot rolling and cold rolling or cold dial.20, seamless steel pipe has an important position in the steel industry in our country.According to incomplete statistics, China's existing 20, about more than 240 seamless steel tube production enterprise, about more than 250 sets of seamless steel pipe unit, an annual output of 450 tons of capacity about 450.From the diameter < 76, accounted for 35%, < phi 159-650, accounting for 25%.Look from breed, general use pipe 1.9 million tons, accounting for 54%;Oil pipeline 760000 tons, accounting for 5.7%;Hydraulic prop, precision tube 150000 tons, accounting for 4.3%;Stainless pipe, bearings, auto tube 50000 tons, accounting for 1.4%.
20 seamless steel tube is made from solid tube ingot or the perforation capillary, then through hot rolling and cold rolling or cold dial.20, seamless steel pipe has an important position in the steel industry in our country.
Rolling seamless pipe raw material is round billet, round tube billet through cutting machine cutting the growth degree of about 1 meter of the billet, and by the conveyor belt to heating furnace.Billet are fed into the furnace heating, the temperature is about 1200 degrees Celsius.Fuel for hydrogen or acetylene.In furnace temperature control is a crucial problem. Circular tube billet after go through pressure punch wear empty.General is one of the more common punch is tapered roller puncher, this kind of punch high production efficiency, product quality good, large amount of perforated hole enlargement, can wear a variety of steel grade.After perforation, circular tube billet has been three-roll skew rolling, rolling or extrusion.To take off after extruding tube sizing.Sizing mill by taper drill bits high-speed rotating billet into punching and forming steel pipe.Steel pipe diameter by sizing mill bit length to determine the diameter.Steel pipe after sizing, into the cooling tower, by water spray cooling, steel pipe after cooling, will be straightening.Steel pipe by the conveyor belt to the metal detection after straightening machine (or water pressure experiment) for internal inspection.If the steel pipe internal crack, air bubble, will be detected.Steel pipe quality through rigorous after manual pick.Sprayed with paint after steel pipe quality, number, specification, batch number, etc., and by crane into the warehouse.
Seamless steel pipe standards (national standard)
【 1 】 structure with seamless tube (GB/T8162-2008) is used for general structure of the mechanical structure of seamless steel tube.
【 2 】 fluid with seamless steel tube transmission (GB/T8163-2008) is used for conveying water, oil, gas and other fluid general seamless steel tube.GB/T8163-2008 (transmission fluid with seamless steel tube) is mainly used for conveying fluid pipeline engineering and large equipment.On behalf of the material (brand) of 20, Q345, etc.
[3] low medium pressure boiler seamless steel tube (GB3087-2008) is used in the manufacture of various structural low intermediate pressure boiler superheated steam pipe, water pipe and locomotive boiler superheated steam pipe and arch brick works of high quality carbon structural steel hot rolling and cold drawing (rolling) seamless steel tube.GB3087-2008 (low intermediate pressure boiler seamless steel tube).Mainly used in industrial boiler and boiler of low intermediate pressure fluid pipe life.On behalf of the material for 10, 20 steel.
[4] high pressure boiler seamless steel tube (GB5310-2008) is used in the manufacture of high pressure and over pressure of the water tube boiler heating surface quality carbon steel, alloy steel and heat resistant stainless steel seamless steel tube.GB5310-2008 (high pressure boiler seamless steel tube).Is mainly used for power plant and nuclear power plant boiler high temperature resistant, high voltage transmission fluid collection box and the pipeline.On behalf of the material of 20 g, 15 crmo, 15 crmog, etc.

[5] fertilizer equipment with high-pressure seamless steel tube (GB6479-2000) is applicable to the working temperature for - 40 ~ 400 ℃, the working pressure of 10 ~ 30 ma chemical equipment and pipeline of high quality carbon structural steel and alloy steel seamless steel tube.GB6479-2000 (high pressure chemical fertilizer equipment with seamless steel tube).Mainly used for fertilizer equipment in high temperature and high pressure liquid pipeline.On behalf of the material for 20, 16 mn, 12 crmo, 12 cr2mo, etc.

[6] Seamless steel pipe used in oil cracking (GB9948-2006) is suitable for oil refinery furnace tube, heat exchangers and pipe seamless steel pipe.GB9948-2006 with seamless steel tube, petroleum cracking).Mainly used in oil refineries in the boiler, heat exchangers and pipe conveying fluid.It represents material for 1cr5mo 20, 12 crmo.