ERW Steel Pipe

　　 Carbon steel pipe is a hollow steel bar, a large number of pipes for transporting fluids such as oil, natural gas, water, gas, steam, etc. In addition, engaged in bending, torsional strength, lighter, so it widely used in the manufacture of mechanical parts and engineering structures. Also used in producing a variety of conventional weapons, the barrel, shells and so on. 　　Carbon steel pipe classification: carbon steel pipe can be divided into seamless steel pipe and welded steel pipe points two categories. By the cross-sectional shape can be divided into the tube and shaped tubes, round steel is widely used, but there are some square, rectangular, semi-circular, hexagonal, equilateral triangle, octagon shaped steel tubing. For steel to withstand fluid pressure hydraulic test should be carried out to test its ability to withstand and quality, does not leak under pressure requirements, wet or expansion of qualified, some steel but also according to the requirements of the standard...

　　High-pressure steel pipe manufacturing methods are divided into hot-rolled (extrusion, expansion) and cold drawn (rolled) two kinds. Among them, the hot-rolled (extrusion, expansion) OD pipe is 22 ~ 530mm, wall thickness in the range of 2.0 ~ 70mm; cold drawn (rolled) pipe diameter ranges from 10 to 108mm, wall thickness range of 2.0 ~ 13mm. 　　High-pressure steel pipe has good mechanical properties at room temperature and high temperature, strict quality control, suitable for a variety of work situations under high pressure conditions. High pressure steel pipes are mainly used in the field, diesel high pressure tubing, fertilizer equipment and pipelines. 　　The main production process of high-pressure steel: billet heating, perforated tube, pipe extension. High-pressure steel pipe rolling, pipe sizing, pipe reducers, pipe cooling and finishing or perforation can be said heating hot rolled pickling cold drawn steel embryo carbon burning jet cutting head of a standard package of fi...

　　Low temperature carbon steel pipe is medium carbon structural steel, cold steel plus low energy are good with good mechanical properties, and low prices, wide sources, so widely used. Its biggest weakness is the low hardenability, cross-sectional dimensions Japan is relatively high workpiece should not be used. Cold steel for low temperature operation, can withstand a certain low temperature impact. 　　Low temperature quench pipe A3 + (30 ~ 50) ℃, in practice, is usually set to the upper limit. High quenching temperature to low temperature pipe heating speed, reduce surface oxidation, and can improve efficiency. The workpiece is uniform austenite, will require sufficient holding time. If the actual installed furnace capacity, would be appropriate to extend the holding time. Otherwise, there may be insufficient due to uneven heating caused by the hardness of the phenomenon. However, the holding time is too long, will also appear coarse grains, oxidation and decarbonization serious i...

　　Cold drawn steel tube is pulled hot-rolled seamless steel tube at room temperature through the pipe die pore is stretched, products required diameter and wall thickness. Drawing is the production of thin-walled, very thin-walled and large-diameter thin-walled capillary tubing and the main method, the advantage of products of high dimensional accuracy, surface roughness, more complete varieties and specifications, and the process can be improved using the heat treatment method mechanical properties of the products. 　　Cold drawn steel production process is as follows: 　　① Prepare pipe material preparation, including pipe material before drawing starts, heat treatment, pickling and cold-drawn steel lubrication before. Heading refers to the head of the tube material is heated and forged thinner, so head first through extubation mold. Mainly through the heat treatment of heating, holding and cooling a series of operations, to soften the tube material, the tube material so as to reduce...

　　GB3087-2008 is a standard for seamless pipes for low and medium pressure boilers. 　　GB3087-2008 is used in the manufacture of water wall, economizer, reheater, superheater and steam pipe for low and medium pressure boilers. 　　The seamless pipe for low and medium pressure boilers (GB3087-2008) is used for the manufacture of superheated steam pipes, boiling water pipes and locomotive boiler superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes for various structures. Hot-rolled and cold-drawn (rolled) seamless pipes of high-quality carbon structural steel. 　　GB3087-2008 "Small and medium pressure boiler seamless steel pipe" provisions. Various types of structural steel pipes for boilers, with an outer diameter of 10 to 426 mm, totaling 43 types. There are 29 kinds of wall thicknesses of 1.5 to 26 mm. 　　GB3087-2008 "Low-medium-pressure boiler seamless steel pipe" and GB5310-2008 "high-pressure boiler seamless steel pipe...

　　The oil casing is a steel pipe used to keep the oil and gas well walls to ensure the normal operation of the well during the drilling process and after completion. Any well should use several layers of casing depending on the depth of the drilling and the geological conditions. After thecasing is down, the cement should be cemented. It is different from the oil pipe and the drill pipe. It can be used repeatedly. It is a one-time raw material. 　　The oil special pipe is mainly used for drilling oil and gas wells and oil and gas transportation. It contains oil drill pipes, oil casings, and oil pipes. Oil drill pipes are used to connect drill collars and drill bits and relay drilling power. The oil casing is mainly used to maintain the well wall during and after completion of the well to ensure the drilling process and the normal operation of the well after completion. The pumping pipe focuses on transporting the oil and gas at the bottom of the well to the ground. The oil casing is t...

　　Wall thickness precision steel pipe production control is a difficult process and improve the accuracy of precision steel wall thickness are mainly the following aspects: 　　1, heating pipes, heating should be uniform, rapid lifting ban temperature. Each heating and cooling, in order to maintain stability. 　　2, centering rollers, opening the same size centering rollers determine the installation is in place, embrace the central core volume adjustments related to the opening angle and various actions. 　　3, rolling centerline, the centerline of the car to ensure that rolling consistent with the centerline of the hole puncher avoid scrolling up and down "the tube to maintain a straight line. 　　4, rolling tool for head and other rolling tool wear should be promptly replaced. 　　5, rolling tool installation, the central leadership must ensure that the centerline of the centerline distance and rolling guide rollers perforated, which is equal to the distance from the upper and...

　　SSAW common defects magnetic particle testing or penetration testing. Spiral pipe magnetic particle testing or penetrant testing can be effectively found that surface cracks, folding, re-skin surface defects, hairline, pinholes. For ferromagnetic materials, magnetic particle testing method should be given priority, because of its high detection sensitivity; for non-ferromagnetic material, such as stainless steel spiral pipe, is used penetrant inspection method. 　　Online austenitic steel spiral pipe, when the insulation is damaged or rain may have infiltrated the site, note that penetration testing to find stress corrosion cracking or pitting and other defects. However, magnetic particle or penetrant testing only on the outer surface of the pipe to detect internal defects in the surface of the powerless. The inner surface of the detector, especially crack type defect detection must be carried out by ultrasonic testing. 　　When the spiral pipe ends aside less resection margin, due ...

　　Proper way to preserve spiral pipe 　　1) Storage space spiral steel pipe products or warehouse, should be selected in clean, smooth drainage area, away from harmful gases or dust in factories and mines. The presence on the ground to clear the weeds and all the debris, keeping a clean steel 　　2) In a warehouse not with acid, alkali, salt, cement, steel and other aggressive materials stacked together. Different varieties of steel should be stacked separately, to prevent confusion, to prevent contact corrosion 　　3) Large steel, rail, steel disgrace, large diameter steel pipe, forgings, etc., may open dumps 　　4) Small and medium steel, wire rod, rebar, medium diameter steel pipe, steel wire and wire rope, etc., can be expected in a well-ventilated storage shed, but it must be the underlying thatch 　　5) Some small steel, sheet, strip, silicon, or thin-walled small-diameter steel pipes, all kinds of cold-rolled, cold-drawn steel products and high prices, corrosive metal products,...

　　Difference between hot stretch reducing pipe and LSAW steel pipe are basically has the following two points: 　　1, Resulting in differnce on product quality due to the different processes, hot stretch reducing also carried out a process after high-frequency welding process that lsaw steel pipe can not found ------ Longitudinal are no clear line inside and outside burrs. Burr presence will affect the tube fluid - flow, burr block the normal flow of fluid, resulting in a whirlpool. According to principles of fluid mechanics, welding must increase local compression, discontinuity make pipe safety factor is also greatly reduced, hot stretch reducing steel production process - fully taken into account the existence of the risk of burrs, to limit burr removal, making it uniform thickness, no difference in the appearance and seamless. So from this point of view, hot stretch reducing pipe joints also completed the transition seamless. 　　2, Weld quality directly determines the quality of ...