Technology Of Seamless Steel Tube Production
Three-roll rolling tube billet have to initially, after the extrusion sizing test, if there is no action after fracture on the surface of pipeline need to be reduced after reducing maker, cutting expand concerning a meter of billet.And then enter the annealing procedure, annealing with acid pickling fluid, marinading when must take note of whether there is a lot of bubble surface, if there is a great deal of bubbles reveal that the high quality of the steel tube can not meet the matching standards.Appearance on cool rolled seamless steel tube is shorter in hot rolled seamless steel pipeline, chilly rolled seamless steel tube wall surface thickness generally smaller sized than warm rolled seamless steel tube, but the surface looks brighter than the thick ASTM A106 seamless steel pipe, not a great deal of rough surface, the diameter is not a lot of burr.
steel pipe cheap of warm rolled seamless steel tube is normally made after heat treatment.Hot-rolled smooth steel tube after QC should pass personnel strict manual pick, after the quality inspection for surface layer of oil, and after that complied with by cool illustration experiment many times, perforation of the experiments carried out after hot rolling processing, if the punched hole diameter is as well big for correcting straightening.After straightening, the transmission device is transmitted to the detector to execute the examination, and then the tag and the spec are taken into the storage facility.
Circular tube billet as well as home heating to punch, three-roll alter rolling, rolling, or pushing - pipeline - sizing (or reducing) - cooling - straightening out to hydrostatic test or examination - > tag, warehousing seamless steel tube is made from strong tube ingot or the perforation blood vessel, after that via warm rolling and also chilly rolling or cold dial.The specification of seamless steel tube is shown by the external size of the wall thickness millimeter.
Usually above 32 mm warm rolled seamless steel tube size, wall thickness 2.5 200 mm, to 6 mm cool rolled smooth steel tube size, wall surface density to 0.25 mm, to 5 mm slim wall surface pipe diameter thickness much less than 0.25 mm, chilly than hot rolled high dimensional precision.
It is generally made from the high quality carbon steel, such as 10, 20, 30, 35, 45, and so on, such as reduced alloy steel, such as 16Mn, 5MnV, and so on, etc., which are made of hot rolled or cool rolled steel, such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc.The smooth pipe made by reduced carbon steel, such as 10 and also 20, is primarily utilized for flow pipe.The smooth job of medium carbon steel such as 45 and 40Cr is utilized to make mechanical parts, such as car as well as tractor parts.Generally make use of seamless steel tube to make certain strength and squashing test.Hot rolled steel pipeline in hot rolled state or warm treatment.Cold rolled with heat therapy.
Warm rolled, as the name implies, the temperature of the rolling item is high, so the deformation resistance is little, can accomplish the big contortion quantity.Take the rolling system of steel plate as an example, the density of the continual spreading billet has to do with 230mm, as well as the density is 1 ~ 20mm after roughing and rolling.At the exact same time, since the density of steel plate is smaller than small, the measurement accuracy demand is relatively reduced, home plate type issue is challenging to appear, the control convexity is provided top priority.