steel bar cheap -roll rolling tube billet need to first, after the extrusion sizing test, if there is no feedback after crack externally of pipe have to be reduced after cutting equipment, cutting grow 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 lot of bubbles reveal that the top quality of the steel tube can not fulfill the equivalent standards.Appearance on chilly rolled seamless steel tube is shorter in hot rolled smooth steel pipe, cool rolled seamless steel tube wall surface thickness usually smaller than hot rolled smooth steel tube, but the surface looks brighter than the thick ASTM A106 seamless steel pipeline, not a lot of rough surface, the size is not a lot of burr.The delivery problem of warm rolled seamless steel tube is generally made after warmth treatment.Hot-rolled smooth steel tube after QC should pass personnel rigorous hands-on pick, after the high quality examination for surface area covering of oil, and then complied with by cold illustration experiment many times, opening of the experiments carried out after hot rolling processing, if the punched opening size is also big for correcting the alignment of straightening.After straightening, the transmission device is sent to the detector to perform the test, and afterwards the label as well as the spec are put into the stockroom.Round tube billet as well as home heating to punch, three-roll skew rolling, rolling, or pressing - pipeline - sizing (or minimizing) - cooling - straightening out to hydrostatic examination or inspection - > tag, warehousing smooth steel tube is made from strong tube ingot or the perforation blood vessel, after that through warm rolling and cool rolling or cool dial.The specification of seamless steel tube is suggested by the outer diameter of the wall surface density millimeter.Usually higher than 32 mm hot rolled seamless steel tube size, wall density 2.5 200 mm, to 6 mm cold rolled smooth steel tube diameter, wall surface thickness to 0.25 mm, to 5 mm slim wall pipeline diameter density less than 0.25 mm, cold than warm rolled high dimensional precision.It is normally made from the top 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 constructed from hot rolled or chilly rolled steel, such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc.The seamless pipe made by low carbon steel, such as 10 and 20, is primarily utilized for circulation pipe.The seamless work of medium carbon steel such as 45 and 40Cr is utilized to make mechanical components, such as cars and truck and tractor parts.Generally utilize smooth steel tube to make sure strength and flattening test.Hot rolled steel pipeline in hot rolled state or heat treatment.Cold rolled with heat treatment.Warm rolled, as the name suggests, the temperature of the rolling item is high, so the deformation resistance is tiny, can accomplish the large contortion quantity.Take the rolling system of steel plate as an instance, the thickness of the continuous spreading billet has to do with 230mm, and the density is 1 ~ 20mm after roughing and rolling.At the same time, due to the fact that the thickness of steel plate is smaller than tiny, the measurement precision need is fairly low, the plate type problem is hard to appear, the control convexity is provided concern.
