Three-roll rolling tube billet must initially, after the extrusion sizing test, if there is no action after fracture externally of pipe have to be reduced after cutting equipment, cutting grow concerning a meter of billet.And then go into the annealing procedure, annealing with acid pickling fluid, pickling when ought to focus on whether there is a great deal of bubble surface, if there is a lot of bubbles show that the high quality of the steel tube can not fulfill the corresponding standards.Appearance on cool rolled smooth steel tube is shorter in warm rolled smooth steel pipe, chilly rolled seamless steel tube wall density usually smaller sized than warm rolled seamless steel tube, however the surface looks brighter than the thick ASTM A106 seamless steel pipe, not a lot of harsh surface area, the size is not a lot of burr.

steel bar China of hot rolled seamless steel tube is typically made after heat treatment.Hot-rolled seamless steel tube after QC should pass personnel strict manual choice, after the quality assessment for surface area finish of oil, and then adhered to by chilly drawing experiment lot of times, perforation of the experiments conducted after hot rolling processing, if the punched hole size is also big for correcting the alignment of straightening.After straightening, the transmission device is transmitted to the detector to carry out the test, and after that the tag and also the specification are put into the storehouse.

Round tube billet and heating to punch, three-roll skew rolling, rolling, or pushing - pipe - sizing (or decreasing) - cooling - straightening to hydrostatic examination or inspection - > tag, warehousing smooth steel tube is made from strong tube ingot or the perforation vein, after that through warm rolling as well as cool rolling or cold dial.The specification of seamless steel tube is suggested by the outer size of the wall density millimeter.

Usually above 32 mm hot rolled smooth steel tube diameter, wall thickness 2.5 200 mm, to 6 mm chilly rolled seamless steel tube size, wall thickness to 0.25 mm, to 5 mm slim wall pipeline diameter thickness much less than 0.25 mm, cool than warm rolled high dimensional precision.

It is usually made from the excellent quality carbon steel, such as 10, 20, 30, 35, 45, etc., such as low alloy steel, such as 16Mn, 5MnV, and so on, etc., which are made from warm rolled or cold rolled steel, such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc.The seamless pipeline made by low 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 made use of to make mechanical parts, such as vehicle as well as tractor parts.Generally use smooth steel tube to guarantee toughness and also squashing test.Hot rolled steel pipe in warm rolled state or warm treatment.Cold rolled with warmth treatment.


Warm rolled, as the name indicates, the temperature level of the rolling piece is high, so the deformation resistance is small, can attain the huge contortion quantity.Take the moving system of steel plate as an instance, the thickness of the continuous casting billet has to do with 230mm, and the thickness is 1 ~ 20mm after roughing as well as rolling.At the very same time, due to the fact that the density of steel plate is smaller sized than tiny, the measurement accuracy requirement is reasonably reduced, the plate type problem is challenging to show up, the control convexity is offered top priority.