Three-roll rolling tube billet should initially, after the extrusion sizing test, if there is no reaction after split externally of pipeline have to be reduced after cutting machine, reducing expand regarding a meter of billet.And then enter the annealing procedure, annealing with acid pickling fluid, marinading when need to pay attention to whether there is a great deal of bubble surface, if there is a great deal of bubbles reveal that the quality of the steel tube can not fulfill the corresponding standards.Appearance on cool rolled smooth steel tube is shorter in warm rolled smooth steel pipeline, chilly rolled smooth steel tube wall surface thickness typically smaller than hot rolled smooth steel tube, but the surface looks brighter than the thick ASTM A106 seamless steel pipe, not a great deal of harsh surface area, the diameter is not a lot of burr.
web page of warm rolled smooth steel tube is normally made after heat treatment.Hot-rolled smooth steel tube after QC must pass personnel rigorous hand-operated choice, after the top quality examination for surface area finish of oil, and then followed by cool illustration experiment lot of times, perforation of the experiments carried out after warm rolling handling, if the punched opening diameter is too large for correcting straightening.After straightening, the transmission tool is transmitted to the detector to accomplish the test, and after that the label and also the spec are put into the stockroom.
Circular tube billet and home heating to punch, three-roll skew rolling, rolling, or pressing - pipe - sizing (or lowering) - cooling - straightening to hydrostatic test or assessment - > tag, warehousing seamless steel tube is made from strong tube ingot or the perforation vein, after that via hot rolling and cool rolling or cold dial.The specification of seamless steel tube is indicated by the outer size of the wall surface density millimeter.
Typically pipe fitting supply than 32 mm warm rolled seamless steel tube size, wall density 2.5 200 mm, to 6 mm cold rolled seamless steel tube diameter, wall surface thickness to 0.25 mm, to 5 mm thin wall surface pipeline diameter thickness less than 0.25 mm, cool than warm rolled high dimensional precision.
It is normally made from the high quality carbon steel, such as 10, 20, 30, 35, 45, etc., such as low alloy steel, such as 16Mn, 5MnV, and so on, and so on, which are made from hot rolled or cold rolled steel, such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc.The smooth pipeline made by reduced carbon steel, such as 10 and also 20, is generally made use of for circulation pipe.The seamless job of tool carbon steel such as 45 as well as 40Cr is made use of to make mechanical parts, such as car as well as tractor parts.Generally use seamless steel tube to make sure strength and flattening test.Hot rolled steel pipe in warm rolled state or warm treatment.Cold rolled with heat therapy.
Warm rolled, as the name suggests, the temperature level of the rolling item is high, so the contortion resistance is small, can attain the big contortion quantity.Take the rolling system of steel plate as an instance, the density of the constant spreading billet has to do with 230mm, and the density is 1 ~ 20mm after roughing as well as rolling.At the same time, since the density of steel plate is smaller than little, the dimension precision requirement is fairly low, home plate kind problem is not easy to show up, the control convexity is offered priority.
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