API 5L Gr.B seamless steel pipe production process, generally used seamless pipe:It is made of 10, 20, 30, 35, 45 carbon bond steel 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolled or cold rolled, American standard API5L Gr.B seamless steel pipe GB 20# seamless steel pipe.10, 20 and other low carbon steel seamless pipe is mainly used for fluid delivery pipeline.45, 40Cr and other medium carbon steel seamless pipe made of seamless pipe to manufacture mechanical parts, the American standard seamless steel pipe, API5L American standard seamless steel pipe general material has, ASTM A106 A53, can be replaced by domestic 20# steel, the American standard steel pipe export packaging requirements are also very strict, fixed length.Bundling. Painting. Pipe cap.All the labels are ready.Mainly in the sea adrift afraid of sea water corrosion., such as car, tractor stress parts.Seamless steel tubes are generally used for strength and flattening tests.Hot rolled steel pipes are delivered in hot rolled or heat treated state;Cold rolled delivery in heat treated condition.Production method according to different production methods can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe, extrusion pipe and so on.Hot - rolled seamless pipe is generally produced on the automatic rolling mill.The solid tube billet is cut into the required length after inspection and surface defects, centering on the perforated end face of the tube billet, and then sent to the heating furnace for heating, and perforated on the punch machine.In the perforation at the same time constantly rotating and forward, under the action of the roller and the head, the tube billet inside the cavity gradually formed, called the capillary.Then it is sent to the automatic pipe mill to continue rolling.After the whole wall thickness of the machine, the diameter of the sizing machine, to meet the requirements of specifications.It is a better method to produce hot - rolled seamless steel pipe by continuous rolling mill.If you want to get small size and good quality seamless tube, cold rolling, cold drawing or the combination of both methods.Cold rolling is usually carried out on a two-high rolling mill, where the steel tube is rolled in a circular groove consisting of a circular groove with a variable section and a stationary tapered head.Cold drawing is usually carried out on 0.5 ~ 100T single chain or double chain cold drawing machine.The extrusion method is that the heated tube billet is placed in the closed extrusion cylinder, the perforation rod moves with the extrusion rod, so that the extruded parts are extruded from the smaller die hole.This method can produce steel tubes with smaller diameter.