Three-roll rolling tube billet have to initially, after the extrusion sizing examination, if there is no reaction after crack externally of pipeline need to be cut after cutting equipment, cutting expand regarding a meter of billet.And then get in the annealing process, annealing with acid pickling liquid, pickling when must take notice of whether there is a lot of bubble surface, if there is a great deal of bubbles reveal that the quality of the steel tube can not meet the corresponding standards.Appearance on cold rolled seamless steel tube is shorter in warm rolled smooth steel pipeline, cold rolled smooth steel tube wall thickness normally smaller sized than hot rolled seamless steel tube, yet the surface area looks brighter than the thick ASTM A106 smooth steel pipeline, not a great deal of rough surface, the size is not a great deal of burr.
The delivery problem of warm rolled seamless steel tube is generally made after warm treatment.Hot-rolled smooth steel tube after QC need to pass team stringent manual pick, after the high quality examination for surface area covering of oil, and afterwards adhered to by chilly illustration experiment lot of times, perforation of the experiments conducted after hot rolling handling, if the punched hole size is as well huge for correcting straightening.After straightening, the transmission gadget is transferred to the detector to carry out the test, and afterwards the label and the spec are put into the stockroom.
Circular tube billet and heating to punch, three-roll skew rolling, rolling, or pushing – pipeline – sizing (or minimizing) – cooling down – correcting the alignment of to hydrostatic test or examination – > tag, warehousing smooth steel tube is made from strong tube ingot or the perforation capillary, then through hot rolling and cold rolling or cold dial.The spec of seamless steel tube is shown by the outer diameter of the wall thickness millimeter.
Typically more than 32 mm hot rolled seamless steel tube size, wall thickness 2.5 200 mm, to 6 mm cold rolled smooth steel tube diameter, wall thickness to 0.25 mm, to 5 mm slim wall pipeline diameter density much less than 0.25 mm, cold than warm rolled high dimensional accuracy.
It is typically made from the excellent quality carbon steel, such as 10, 20, 30, 35, 45, etc., such as low alloy steel, such as 16Mn, 5MnV, etc., etc., which are constructed from hot rolled or cool rolled steel, such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc.The seamless pipe made by low carbon steel, such as 10 and 20, is mainly made use of for circulation pipe.The seamless job of medium carbon steel such as 45 and 40Cr is made use of to make mechanical components, such as vehicle as well as tractor parts.Generally use smooth steel tube to make sure toughness as well as squashing test.Hot rolled steel pipeline in hot rolled state or warm treatment.Cold rolled with warmth therapy.
alloy pipe rolled, as the name suggests, the temperature of the rolling piece is high, so the contortion resistance is little, can accomplish the large contortion quantity.Take the rolling system of steel plate as an example, the thickness of the constant spreading billet is about 230mm, as well as the density is 1 ~ 20mm after roughing and also rolling.At the same time, because the thickness of steel plate is smaller than tiny, the measurement accuracy need is relatively reduced, home plate kind issue is difficult to appear, the control convexity is offered priority.