Three-roll rolling tube billet have to first, after the extrusion sizing examination, if there is no response after crack on the surface of pipe have to be cut after cutting maker, reducing grow regarding a meter of billet.And after that go into the annealing procedure, annealing with acid pickling liquid, pickling when must pay attention to whether there is a lot of bubble surface area, if there is a lot of bubbles show that the quality of the steel tube can not satisfy the matching standards.Appearance on cool rolled seamless steel tube is shorter in hot rolled seamless steel pipeline, chilly rolled seamless steel tube wall density typically smaller sized than warm rolled seamless steel tube, yet the surface looks brighter than the thick ASTM A106 seamless steel pipeline, not a great deal of harsh surface area, the size is not a lot of burr.


The distribution condition of warm rolled seamless steel tube is usually made after heat treatment.Hot-rolled smooth steel tube after QC must pass personnel rigorous manual choice, after the top quality examination for surface finish of oil, and then complied with by cool illustration experiment many times, perforation of the experiments carried out after warm rolling handling, if the punched opening size is too large for straightening straightening.After straightening, the transmission tool is transmitted to the detector to perform the examination, and after that the tag as well as the specification are put into the storage facility.

Round tube billet as well as heating to punch, three-roll alter rolling, rolling, or pressing - pipe - sizing (or decreasing) - cooling down - correcting the alignment of to hydrostatic examination or inspection - > tag, warehousing smooth steel tube is made from solid tube ingot or the opening blood vessel, after that with hot rolling and also chilly rolling or cool dial.The spec of smooth steel tube is indicated by the outer size of the wall surface thickness millimeter.

Typically above Tianjin Decho International Trade Co., Ltd rolled seamless steel tube size, wall surface thickness 2.5 200 mm, to 6 mm cool rolled seamless steel tube diameter, wall surface density to 0.25 mm, to 5 mm slim wall pipeline size density less than 0.25 mm, cold than hot rolled high dimensional accuracy.

It is generally made from the excellent 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, and so on, which are made from hot rolled or chilly rolled steel, such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc.The seamless pipe made by reduced carbon steel, such as 10 as well as 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 parts, such as automobile as well as tractor parts.Generally use seamless steel tube to make certain strength and also flattening test.Hot rolled steel pipeline in hot rolled state or warmth treatment.Cold rolled with warm therapy.

Warm rolled, as the name suggests, the temperature level of the rolling item is high, so the deformation resistance is tiny, can attain the huge contortion quantity.Take the rolling system of steel plate as an instance, the density of the constant casting billet has to do with 230mm, and also the density is 1 ~ 20mm after roughing and rolling.At the same time, since the density of steel plate is smaller than small, the measurement precision demand is fairly reduced, home plate kind issue is hard to appear, the control convexity is provided concern.