Three-roll rolling tube billet have to first, after the extrusion sizing test, if there is no reaction after fracture externally of pipe have to be reduced after reducing machine, cutting expand about a meter of billet.And after that enter the annealing process, annealing with acid pickling liquid, marinading when should take note of whether there is a great deal of bubble surface, if there is a lot of bubbles reveal that the high quality of the steel tube can not satisfy the corresponding standards.Appearance on cold rolled seamless steel tube is shorter in hot rolled smooth steel pipe, chilly rolled seamless steel tube wall surface thickness typically smaller than warm rolled smooth steel tube, however the surface area looks brighter than the thick ASTM A106 seamless steel pipe, not a great deal of rough surface area, the size is not a great deal of burr.

steel bar of warm rolled smooth steel tube is typically made after warm treatment.Hot-rolled seamless steel tube after QC should pass staff rigorous hands-on pick, after the quality evaluation for surface coating of oil, and afterwards complied with by chilly drawing experiment sometimes, perforation of the experiments carried out after hot rolling handling, if the punched hole size is too huge for correcting straightening.After straightening, the transmission tool is transmitted to the detector to accomplish the test, and after that the tag as well as the spec are put into the stockroom.

Round tube billet and heating to punch, three-roll alter rolling, rolling, or pressing - pipeline - sizing (or decreasing) - cooling - aligning to hydrostatic examination or evaluation - > tag, warehousing smooth steel tube is made from solid tube ingot or the perforation blood vessel, after that through warm rolling and cool rolling or cool dial.The spec of seamless steel tube is suggested by the external size of the wall surface density millimeter.

Generally more than 32 mm hot rolled smooth steel tube diameter, wall surface thickness 2.5 200 mm, to 6 mm chilly rolled smooth steel tube size, wall surface thickness to 0.25 mm, to 5 mm slim wall pipe diameter density less than 0.25 mm, chilly than hot rolled high dimensional precision.

It is typically made from the premium quality carbon steel, such as 10, 20, 30, 35, 45, etc., such as reduced alloy steel, such as 16Mn, 5MnV, and so on, etc., which are made of warm rolled or cold rolled steel, such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc.The seamless pipe made by reduced carbon steel, such as 10 and also 20, is primarily made use of for circulation pipe.The smooth job of tool carbon steel such as 45 and also 40Cr is used to make mechanical components, such as cars and truck and also tractor parts.Generally use seamless steel tube to make certain stamina as well as squashing test.Hot rolled steel pipeline in hot rolled state or heat treatment.Cold rolled with warm therapy.

more information rolled, as the name suggests, the temperature of the rolling item is high, so the contortion resistance is tiny, can attain the huge contortion quantity.Take the rolling system of steel plate as an instance, the density of the continuous casting billet is about 230mm, as well as the density is 1 ~ 20mm after roughing and rolling.At the very same time, because the density of steel plate is smaller than small, the measurement accuracy requirement is reasonably reduced, the plate kind problem is challenging to show up, the control convexity is offered concern.