steel rod price -roll rolling tube billet should first, after the extrusion sizing examination, if there is no reaction after fracture on the surface of pipeline have to be cut after reducing maker, cutting expand concerning a meter of billet.And then get in the annealing procedure, annealing with acid pickling liquid, marinading when should pay attention to whether there is a lot of bubble surface area, if there is a great deal of bubbles show that the quality of the steel tube can not fulfill the matching standards.Appearance on cool rolled smooth steel tube is much shorter in hot rolled seamless steel pipe, chilly rolled seamless steel tube wall surface thickness generally smaller than warm rolled smooth steel tube, however the surface looks brighter than the thick ASTM A106 smooth steel pipeline, not a lot of rough surface area, the size is not a lot of burr.

The delivery condition of hot rolled smooth steel tube is normally made after warmth treatment.Hot-rolled smooth steel tube after QC must pass personnel strict hands-on choice, after the quality examination for surface finish of oil, and then followed by cool drawing experiment lot of times, perforation of the experiments conducted after warm rolling processing, if the punched opening size is also big for correcting straightening.After straightening, the transmission gadget is transmitted to the detector to carry out the examination, and afterwards the label and also the requirements are put into the storehouse.

Circular tube billet and home heating to punch, three-roll alter rolling, rolling, or pressing - pipe - sizing (or lowering) - cooling down - correcting to hydrostatic examination or examination - > tag, warehousing seamless steel tube is made from solid tube ingot or the opening blood vessel, after that via warm rolling as well as chilly rolling or cold dial.The specification of seamless steel tube is indicated by the external size of the wall thickness millimeter.

Generally greater than 32 mm hot rolled smooth steel tube diameter, wall surface thickness 2.5 200 mm, to 6 mm chilly rolled seamless steel tube diameter, wall surface thickness to 0.25 mm, to 5 mm thin wall surface pipe size density much less than 0.25 mm, cold than warm rolled high dimensional accuracy.

It is generally made from the high quality carbon steel, such as 10, 20, 30, 35, 45, and so on, such as low alloy steel, such as 16Mn, 5MnV, etc., etc., which are made of hot rolled or cold rolled steel, such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc.The smooth pipeline made by low carbon steel, such as 10 and 20, is mainly utilized for flow pipe.The smooth job of tool carbon steel such as 45 and also 40Cr is made use of to make mechanical parts, such as automobile as well as tractor parts.Generally utilize seamless steel tube to ensure strength as well as squashing test.Hot rolled steel pipeline in warm rolled state or heat treatment.Cold rolled with warmth therapy.

http://www.tjdecho.com rolled, as the name indicates, the temperature level of the rolling piece is high, so the contortion resistance is tiny, can accomplish the big deformation quantity.Take the rolling system of steel plate as an example, the thickness of the constant casting billet is about 230mm, and the thickness is 1 ~ 20mm after roughing as well as rolling.At the same time, because the density of steel plate is smaller sized than tiny, the dimension accuracy demand is fairly low, home plate kind trouble is difficult to appear, the control convexity is offered priority.