more information -roll rolling tube billet have to initially, after the extrusion sizing examination, if there is no feedback after split externally of pipe need to be reduced after cutting machine, reducing expand concerning a meter of billet.And then enter the annealing procedure, annealing with acid pickling liquid, pickling when ought to focus on 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 satisfy the corresponding standards.Appearance on cold rolled smooth steel tube is much shorter in warm rolled seamless steel pipeline, chilly rolled smooth steel tube wall surface thickness usually smaller sized than hot rolled seamless steel tube, but the surface looks brighter than the thick ASTM A106 seamless steel pipeline, not a great deal of harsh surface area, the diameter is not a great deal of burr.
The distribution condition of warm rolled smooth steel tube is normally made after heat treatment.Hot-rolled seamless steel tube after QC should pass staff strict hand-operated pick, after the high quality inspection for surface area covering of oil, and afterwards followed by cold illustration experiment sometimes, opening of the experiments performed after warm rolling processing, if the punched opening diameter is as well big for aligning straightening.After straightening, the transmission device is transferred to the detector to execute the test, and after that the label and the specification are taken into the stockroom.
Round tube billet and also home heating to punch, three-roll alter rolling, rolling, or pushing – pipe – sizing (or lowering) – cooling – correcting the alignment of to hydrostatic test or examination – > tag, warehousing smooth steel tube is made from strong tube ingot or the opening capillary, then via hot rolling and also chilly rolling or cold dial.The specification of smooth steel tube is suggested by the outer size of the wall density millimeter.
Normally above 32 mm warm rolled seamless steel tube diameter, wall surface density 2.5 200 mm, to 6 mm chilly rolled seamless steel tube size, wall surface thickness to 0.25 mm, to 5 mm slim wall surface pipeline size thickness less than 0.25 mm, cool than hot rolled high dimensional precision.
It is normally made from the high quality carbon steel, such as 10, 20, 30, 35, 45, and so on, such as reduced alloy steel, such as 16Mn, 5MnV, etc., etc., which are made from hot rolled or cold 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 generally used for flow pipe.The smooth job of medium carbon steel such as 45 as well as 40Cr is made use of to make mechanical components, such as car and also tractor parts.Generally utilize seamless steel tube to guarantee strength and also squashing test.Hot rolled steel pipeline in warm rolled state or warmth treatment.Cold rolled with warmth therapy.
Hot rolled, as the name indicates, the temperature level of the rolling piece is high, so the contortion resistance is tiny, can achieve the big contortion quantity.Take the rolling system of steel plate as an instance, the thickness of the continual casting billet is about 230mm, and also the thickness is 1 ~ 20mm after roughing and rolling.At the exact same time, due to the fact that the density of steel plate is smaller sized than tiny, the dimension precision requirement is fairly low, the plate type problem is hard to show up, the control convexity is offered priority.