The steel pipe extrusion process includes the following production processes: ① Billet: round billet after peeling, cut length, drilling, machining and cleaning, you can form a hollow tube for the blank ready. ② Billet heating: according to different steel, can be divided into three heating stages to ensure that the production process to meet the required temperature. ③ Preheat: a floor gas furnace will be used for the first step of heating, the blank preheated to 700 ℃ ~ 900 ℃. ④ Induction heating unit (the first stage): the first group of induction heating unit will be heated to the blanking process required temperature, about 1100 ℃ ~ 1250 ℃, the specific temperature value determined by the production of steel. Induction heating unit using low frequency heating mode. ⑤ Blank lubrication: in the hole before the first glass fiber lubrication. ⑥ Reaming: The round billet that has been drilled before squeezing must start to reaminate from a smaller pilot hole until the inner bore reaches the final machining accuracy. ⑦ Induction heating unit (second stage): The second set of induction heating unit is used to continue heating the intermediate blank after the blank is reamed. Depending on the normal operating conditions of the transport conveyor, it is required to heat the intermediate billet to 1200 ° C or to the temperature required by the material. ⑧ Extruder: billet loaded to the extruder, through the extrusion process into steel pipe. Extruder auxiliary system is responsible for feeding, replacement extrusion die, squeeze the use of the pressure and the separation of the remaining material head. ⑨ Cooling pool: cooling pool is arranged on the side of the output roller for rapid cooling of steel. ⑩ Cooling bed: in the need for air cooling, the pipe can be transported to the cooling bed.

According to GB/T9711.1 pipeline performance requirements and the different tempering temperature, pipe tempering can be divided into the following: 1. Pipeline low temperature tempering (150-250 degrees) The low temperature tempering tissue is tempered martensite. Its purpose is to maintain the high hardness of hardened steel and high wear resistance under the premise of reducing its quenching stress and brittleness, so as not to use when the crack or premature damage. It is mainly used for a variety of high-carbon cutting tooling, measuring tools, GB/T9711.1 pipeline steel pipe, rolling bearings and carburizing pieces, tempering hardness is generally HRC58-64. 2. Pipeline temperature tempering (250-500 degrees) The medium of tempering tempering is tempered. The aim is to achieve high yield strength, elasticity and high toughness. Therefore, it is mainly used for a variety of GB/T9711.1 pipeline steel pipe and hot mold processing, tempering hardness is generally HRC35-50. 3. Pipeline high-temperature tempering (500-650 degrees) The high temperature tempering organization is tempered sorbite. It is customary to treat quenching and high temperature tempering combined with heat treatment called quenching and tempering treatment, its purpose is to obtain strength, hardness and plasticity, toughness are better comprehensive mechanical properties. Therefore, widely used in automotive, GB/T9711.1 pipeline steel pipe, machine tools and other important structural parts, such as connecting rods, bolts, gears and shafts. After tempering hardness is generally HB200-330.

Inner wall shot blasting machine for oil casing and oil casing products inside and outside the surface of the shot blasting, remove its oxide and slag and other debris, showing a metallic luster, in order to facilitate the workpiece painting and coating. It can be based on the different diameter of the oil casing and the use of different shot blasting or shot peening equipment. Shot blasting process can still be said that the current domestic and international the most advanced anti-corrosion technology. How does the inner wall shot blasting machine clean up the small diameter oil casing? Summarized as follows: Small oil bushings with a diameter of 600 mm shot blasting machine - The equipment uses automatic shot blasting to remove surface rust and crush the scale, rust layer and its surface on the inner surface of the oil casing with a high-speed projectile jet Debris, to obtain a fine bright surface, improve the tensile and compressive strength of the workpiece for the inner surface of the paint to increase the adhesion to achieve corrosion, protection, to extend the life of the purpose of oil casing. After cleaning the workpiece surface surface finish and roughness meet the relevant standards. Small diameter oil casing using the inner wall shot peening machine, oil casing inner shot peening processing line, mainly including mobile trolley, sand bucket, sandblasting tank, spray gun, gun carrier, oil casing bearing system, bottom pellet conveyor belt Machine, bucket elevator, maintenance platform, separator, dust removal system, bracket, pneumatic system, compressed air system, electronic control system. Oil casing through the shot blasting treatment, so that a certain degree of roughness of the smooth surface, increase the adhesion of spraying, improve the surface quality and anti-corrosion effect. Its excellent cleaning performance makes the past labor-intensive sandblasting and wire brush methods become obsolete. At the same time, the machine can minimize production costs and significantly increase output. A filter cartridge, one-piece centrifugal throws, can be ejected in a controlled manner and direction, and the pellets are circulated. The sealing ring size can be adjusted to suit different diameters of pipes and is easy to replace. Unlike other surface cleaning and pretreatment methods, the blasting process without the chemical reaction does not contaminate the environment. Oil casing wall shot blasting machine is simple to install, low cost, space occupies small, no pit or other discharge pipeline.

Oil casing production and installation process involves a lot of testing, mainly in the following: 1, Ultrasonic testing When the ultrasonic wave propagates in the tested material, the acoustic characteristics of the material and the change of the internal structure have a certain influence on the propagation of the ultrasonic wave, and the change of the material performance and structure is realized by detecting the degree and condition of the ultrasonic wave. 2, Ray detection Ray detection is the use of normal parts and defects through the amount of radiation is different, resulting in the difference between the blackness of the film. 3, Penetration testing Penetration test is the use of liquid capillary action, the infiltration of liquid into the surface of the solid material surface defects, and then through the imaging agent will penetrate the permeate into the surface to show the presence of defects.Penetration testing is suitable for a variety of metal and ceramic workpieces, and from the infiltration operation to the defect display time is relatively short, generally about half an hour, can detect surface fatigue, stress corrosion and welding cracks, can directly measure the size of the crack. 4. Magnetic particle testing Magnetic particle testing is the use of magnetic flux leakage and the adsorption of magnetic powder, the formation of magnetic marks, to provide defect display, can detect surface and sub-surface defects, easy to identify the nature of defects, paint and plating surface does not affect the detection sensitivity. 5, Eddy current testing Eddy current testing is mainly used in the workpiece in the eddy current, to analyze the internal quality of the workpiece, can detect a variety of conductive material surface and near surface defects, usually difficult to control parameters, test results difficult to explain, and requires the detection of objects Must be conductive cracks, and can indirectly measure the defect length. 6, Magnetic flux leakage detection The magnetic flux leakage detection of oil casing is based on the high magnetic permeability of ferromagnetic materials, and the quality of active oil casing is detected by measuring the change of permeability caused by defects in ferromagnetic materials. 7, Magnetic memory detection Magnetic memory detection is derived from the physical phenomena of metal magnetic phenomena and the relationship between the dislocation process, with high efficiency, low cost, no need to polish and many other advantages in the industry has important and wide application prospects.

3PE anti-corrosion steel pipe in the course of the precautions, three-layer structure of polyethylene (3PE) anti-corrosion coating with its good corrosion resistance, moisture resistance and mechanical properties, in the oil pipeline industry has been widely used. This kind of anti-corrosion pipe pipe end easily due to corrosion and the emergence of the Alice problem. Analysis: 3PE coating steel pipe in the polished section of the polyethylene layer groove, the tube end of the weld is not grinding or grinding is not smooth, will lead to protruding parts of the polyethylene at the bottom of the epoxy powder was worn off , In the anti-corrosion tube open time for a long time, the weld surface metal will be first corrosion, resulting in 3PE anti-corrosion layer of Alice phenomenon. To avoid 3PE anti-corrosion tube side of the side of the measures are: 1, Without affecting the case of nozzle welding, should be appropriate to increase the end of the polyethylene layer epoxy powder length of the reservation, can prevent the steel pipe for a long time, pipe metal corrosion caused by a serious 3PE corrosion Alice. 2, Anti-corrosion pipe open for a long time, should be covered in the pipe end to prevent rain erosion, resulting in serious corrosion pipe end. The following are the same as the " 3, If the pipeline site construction period is longer, you can brush in the pipe side of the metal can be welded to install anti-rust paint to prevent the corrosion tube during storage due to corrosion caused by 3PE anti-corrosion layer Alice. 4, Strict control of the end of the pipe at the end of the weld grinding quality. In the weld at the polyethylene groove outside the body and other parts of the same, so that the epoxy powder to retain the length of> 20mm, to prevent the bottom of the epoxy powder at the weld first corrosion caused by 3PE anti-corrosion layer Alice. Pipe end weld grinding should pay attention to: 1) from the beginning of the weld to the polyethylene chamfer should be 10-20mm no weld height and the same body of the same layer of polyethylene, to ensure that the tube end Polyethylene groove at the extrusion bonding quality. 2) weld after grinding the height should be done with the body flush, do not have a clear extra height, in order to prevent polished in the polished layer of polyethylene, the epoxy powder together with the polished.