Innovation Of Seamless Steel Tube Production

Three-roll rolling tube billet must first, after the extrusion sizing test, if there is no feedback after crack externally of pipeline need to be reduced after cutting device, reducing grow concerning a meter of billet.And after that get in the annealing process, annealing with acid pickling liquid, pickling when need to take notice of whether there is a great deal of bubble surface, if there is a lot of bubbles show that the quality of the steel tube can not meet the corresponding standards.Appearance on cold rolled smooth steel tube is shorter in hot rolled smooth steel pipeline, cold rolled seamless steel tube wall surface density generally smaller than hot rolled smooth steel tube, but the surface area looks brighter than the thick ASTM A106 seamless steel pipeline, not a lot of harsh surface area, the size is not a lot of burr.

The shipment problem of hot rolled seamless steel tube is usually made after warm treatment.Hot-rolled smooth steel tube after QC should pass personnel rigorous hands-on choice, after the top quality inspection for surface covering of oil, and then followed by chilly illustration experiment lot of times, perforation of the experiments carried out after warm rolling processing, if the punched hole diameter is as well big for correcting the alignment of straightening.After straightening, the transmission gadget is sent to the detector to carry out the test, and then the tag and the spec are put into the storage facility.

Round tube billet and also home heating to punch, three-roll skew rolling, rolling, or pressing - pipeline - sizing (or decreasing) - cooling - aligning to hydrostatic examination or assessment - > tag, warehousing seamless steel tube is made from strong tube ingot or the opening capillary, then with hot rolling and chilly rolling or chilly dial.The requirements of seamless steel pipe tube is shown by the external size of the wall thickness millimeter.

Usually above 32 mm warm rolled seamless steel tube diameter, wall surface thickness 2.5 200 mm, to 6 mm cold rolled smooth steel tube size, visit here wall thickness to 0.25 mm, to 5 mm thin wall surface pipeline size thickness much less than 0.25 mm, cool than warm rolled high dimensional accuracy.

It is usually 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 from warm rolled or cool rolled steel, such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc.The smooth pipe made by low carbon steel, such as 10 as well as 20, is mainly used for circulation pipe.The seamless work of tool carbon steel such as 45 as well as 40Cr is utilized to make mechanical parts, such as automobile and tractor parts.Generally utilize seamless steel tube to make certain strength and also flattening test.Hot rolled steel pipeline in warm rolled state or heat treatment.Cold rolled with warmth therapy.

Warm rolled, as the name indicates, the temperature of the rolling item is high, so the contortion resistance is small, can attain the huge deformation quantity.Take the moving system of steel plate as an example, the density of the continuous spreading billet is about 230mm, and the thickness is 1 ~ 20mm after roughing and rolling.At the same time, because the density of steel plate is smaller than tiny, the dimension precision need is fairly low, the plate type trouble is hard to show up, the control convexity is given priority.

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