LSAW Steel Pipe

　　The first part of the fire-resistant spiral steel pipe copolymer adhesive part of the functional group and the epoxy primer epoxy group can react to form hydrogen bonds or chemical bonds, so that the middle layer and the bottom layer form a good bond; non-polar ethylene part It has good affinity with the surface layer polyethylene, so the middle layer and the top layer also have good bonding properties. The main function of the polyethylene surface layer is to provide mechanical protection and corrosion protection, and has the same effect as the traditional two-layer polyethylene anti-corrosion layer. 　　The following describes the production process of fire-resistant spiral steel pipe: 　　(1) Raw materials are strip coils, welding wire, flux. Strict physical and chemical testing is required before input. 　　(2) The steel head and tail are butt jointed, and the single wire or double wire submerged arc welding is used, and the automatic submerged arc welding is used after the steel...

　　Alloy steel pipe is a kind of seamless steel pipe , its performance is much higher than the general seamless steel pipe , because this steel pipe inside containing Cr, high temperature resistance, low temperature, corrosion-resistant performance of other non-pipe joints not match, so the more extensive use of alloy tube in the petroleum, aerospace, chemical, electric power, boiler, military, and other industries. 　　The main use of alloy steel pipe used in power plants, nuclear power, high-pressure boiler, high temperature superheater and re-heater high pressure and high temperature piping and equipment, it is made ??of high quality carbon steel, alloy structural steel and heat-resistant stainless steel material, hot-rolled (extrusion, expansion) or cold-rolled (pull) made??. 　　The biggest advantages of alloy steel pipe 　　Can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the fiel...

　　Piercing is the first step of hot-rolled seamless steel pipe deformation, and its role is to solid hollow tube billet dressed as capillary. 　　Due to wear a capillary surface defects or eccentric (uneven thickness) is difficult to eliminate or reduce the deformation process, therefore, the quality of perforated capillary has a very important impact on the quality of hot-rolled seamless steel pipe. Way pressure tube perforation punching, pushing rotary piercing and piercing. Thick-walled seamless steel mainly used in petroleum geology drilling pipe, petrochemical used in cracking tubes, boiler tubes, pipes and automotive bearings, tractors, aviation and other precision tube structure, its manufacturing process: hot rolled seamless steel tube round → heating → three perforated roll rolling, rolling or extrusion → detached → sizing (or reducing) cooling → straightening → ??hydrostatic test (or testing) logo → storage. 　　Hot-rolled seamless steel ingot casting can destroy tissue, gra...

　　Ultrasonic detector gas leak detection system is different from the specific design of the sensor to sense that it is limited to a specific gas, but rather to detect sound. 　　Ultrasonic focusing on industrial leak detection, leak detection and predictive maintenance, products and solutions in steel and non-ferrous metals, tobacco and food and beverage, automotive, chemical and oil and gas, mining and cement, glass manufacturing, electricity and cleaning system, military, paper and printing, rail transport, water treatment, infrastructure, subway fan and large air conditioning systems, port automation, and many other industries are widely used. 　　Any gas leakage through holes will generate eddy currents, ultrasound will be part of the band, making the ultrasonic detector leak detection system capable of sensing any kind of gas leak. Drawing process of precision seamless tube with a detection system scan, you can hear the sound from the headphones leak or see changes in the digita...

　　Small diameter high-pressure boiler tube surface defects that affect the quality, mainly due to waste generation. 　　Boiler pipes often in high temperature and high pressure work, pipe smoke and water at high temperature steam oxidation and corrosion effects will occur, thus requiring durable steel with high strength, high oxidation resistance, and good organizational stability, high pressure boiler tube in addition to chemical composition and mechanical properties, hydrostatic testing done by the root, to be flaring, flattening test. Steel to heat treatment delivery. In addition, the finished steel microstructure, grain size, there are certain requirements decarburization. 　　High-pressure boiler tubes are seamless steel pipe categories. Seamless same manufacturing method, but used in the manufacture of steel pipe, there are strict requirements. Often in high-pressure boiler tubes at high temperature and pressure conditions of use, the tube under the effect of high temperature ga...

　　Pipe forming the strip is unequal curvature composite longitudinal deformation process and continuous operation in cross section, and the strip is bent by the force of a multi-directional deformation process. 　　The basic principle of straight seam steel pipe forming theory is by the action of an external force to produce plastic deformation of the steel strip into a desired shape and size tubes. Since the steel pipe in the process of deformation of the main surface in a continuous horizontal and vertical aspects, the binding applied thereon is arranged in two aspects to implement and pass through the mill roll forming, roll passes is to make transverse deformation of steel, the steel sheet rolling mill is arranged to produce longitudinal deformation, the specific operation models and a variety of differences in engineering is a continuous steel deformation process to be implemented in stages, from the corresponding mill (including the roll groove and mill arrangement) to achieve. ...

　　Precision steel pipes are common in real life, but few friends know that precision steel pipes are seamless steel pipes. Therefore, some of the characteristics of precision steel pipes often represent the characteristics of seamless steel pipes. Precision steel pipes have strong toughness and can act as some support in buildings and can withstand a lot of pressure. Therefore, the seamless steel pipe also has good toughness, and because of its large cross-sectional area, it is widely used in fluid pipes. 　　In addition, the stainless steel pipe is safe, reliable, hygienic and environmentally friendly, economical, the thin wall of the pipe and the successful development of a new reliable, simple and convenient connection method, so that it has more advantages that other pipes are irreplaceable, and the application in engineering will come. The more you use, the more popular it will be, and the prospects will be good. 　　Stainless steel seamless pipe is a hollow long round steel, wide...

　　 Spiral steel pipe , also known as helical or spiral tube body. Spiral steel pipe outer diameter of about 30 nm, inner diameter of about 10 nanometers, adjacent helical pitch of about 11 nm. Spiral pipe per one week from the 6 surrounded nucleosome, H1 histone in the inner surface of the spiral steel chamber, to maintain the structure of spiral steel plays an important role. Composed by the nucleosome 10 nm 30 nm fiber to form spiral of crude fiber, so that further compression 6 times the length of DNA. Spiral steel pipe is mainly used for oil, natural gas pipelines, and its specifications diameter * wall thickness. There are one-sided spiral pipe welding and double welding, pipe should ensure hydrostatic testing, tensile strength and cold bending properties of the weld compliance. 　　1, 100% of the steel quality inspection, so that the whole process of steel production in the effective detection, monitoring under, effectively ensure the product quality. 　　2, all the equipment the...

　　 Spiral pipe insulation method from the start of a process which also suppressed as in the pipe wall plus anti-corrosion coating, can be increased loop resistance, reduce corrosion current;. External DC power supply, the steel pipe caused by the negative potential of the soil, forming a cathodic protection, the potential difference between the anode and cathode can be eliminated, stopped anode and cathode process fundamentally. anticorrosive coating rule table, cathodic protection of the rule of law. But once the anti-corrosion coating is damaged, exposed iron part will accelerate local corrosion. Therefore, anti-corrosion coating and cathodic Protection of this combination is to rid the method table, economical and effective. As stated in the United States and other countries, using the anti-corrosion coating cathodic protection must be used at the same time. 　　But for the city gas system, due to the dense network of underground pipes, cathodic protection of the external power su...

　　Currently, double-sided spiral pipe is widely used submerged arc welding technology, following the formation and characteristics of what the submerged arc welding. 　　Principle of submerged arc welding: submerged arc welding is performed by arc welding heat, and manual arc welding is different: submerged arc welding wire is bare, no paint above, submerged arc flux is indeed to be welded in advance shop Department, submerged arc welding wire extends into the flux, the arc is burning in flux. 　　SAW formation process like this: the wire in contact with the workpiece, press the start button and instantly after pressing, welding wire and workpiece energized wire Withdrawing arc ignition, welding carriage forward, under continuous wire to transport, maintain Arc burning at the solder layer, formed under the arc weld pool. In an arc around the solder melts to form a cavity. This empty and the pool continues to advance, but the pool behind the metal solidified, forming a continuous weld....

　　Spiral steel packaging should be able to avoid loose and damaged during normal handling, transport and storage. 　　If the demand side of the spiral steel packaging materials and packaging have special requirements should be specified in the contract; if not specified, packaging materials and packaging methods are available for parties to choose from. 　　Packaging materials shall comply with the relevant requirements. If there is no requirement of packaging material, it should be up to comply with the intended use, avoiding waste and environmental pollution. 　　If the customer can not have a bump spiral pipe and other damage in appearance, can be considered between the spiral steel pipe protection device. 　　Since the thin-walled spiral pipe thin walled tube can be used within or outside the tube support framework for the protection measures. Bracket and frame materials and using the same material steel spiral pipe material. 　　Spiral pipe ends such as threaded, thread protector...

　　Precision light pipe with hydraulic oil products tend to be more exposed, in use for some time, the oil needs to be done to deal with acid. Precision light pipe to the oil pickled specifically, how does it work? 　　1, With a groove base: Base tank plastic aquarium tank water to about half was added, followed by addition of solid caustic soda (NaOH) to a concentration of 18-25%, and then heating with steam can be used to reach more than 80 ℃. 　　2, Whitening precision light tubes Do not use oil or dirty sling, and after completion of washing to be replaced by alkaline water and had clean sling, and finally by more than 80 ℃ hot water tank cleaning. 　　3, The oil content of more dirty and must be washed at high temperature sling and degreasing a base slot, the base of the cylinder must sling before use after cleaning the hot tank. 　　4, The cylinder surface when the oil slick must be promptly removed manually, which uses a plastic dish filled to the level of the oil slick drag. 　...

　　Pipe machining process requires strict, in which the hot rolling process is a very important step, in which to introduce Caution heating pipe in the process. 　　1, The pipe must be able to feed one of those metal properties were a good understanding before performing hot rolling, when the deforming force is relatively low during the hot-rolled steel is very easy. But for pipe materials which contain some or ingots, so prior to hot rolling must be able to be on one of those ingot some eliminated, making it organizational capacity and resilience are able to get some improvement, and also the pipe during the hot rolling process which also would have been greatly protected. 　　2, Pay attention to each pipe section has a temperature uniformity in all directions during the hot rolling process, so that the pipe can better meet the requirements of various technological aspects in later. In addition, the heating pipe will affect a very important reason for the life of the pipe. 　　3, The h...

　　In recent years, the application of powder composites with growing demands on the subject side is also rising, the above conventional method is no longer meet the demand, thus producing a variety of non-destructive inspection side of the new method, such as: 　　1. Brake noise and vibration detection method 　　Acoustic vibration detection method for the side that is the side of the workpiece to produce the excitation of mechanical vibrations, by the side of the workpiece to determine the vibration characteristics of its side by the amount of defects. 　　2. No pull-side wave logo 　　Since the emblem can wave through the dielectric material, so the emblem side wave NDT method came into being. Logo emblem wave detection side is to study wave reflection, projection, diffraction, interference, changing the cavity emblem scrambling and other physical characteristics. Emblem and wave to act on the subject side of the material, its electrical characteristics eleven emblem dielectric const...

　　At present, domestic steel producers face enormous challenges seamless steel overcapacity, have to adjust product structure, eliminate backward production capacity and research and development of high-quality products. Experimental studies have shown: the implementation of control of the cooling process can be controlled phase transformation processes, grain refinement, thus improving the mechanical properties of hot-rolled seamless steel pipe production in the cooling process. Therefore, the study changes of microstructure and properties of steel under different cooling system after hot rolling seamless steel pipe to carry great significance and value. Because of seamless steel pipe having a larger cross-sectional dimensions and specifications outline the scope of the change, making it the control and implementation of online heat treatment faced by many variables, such that controlled cooling technology implementation and application in the production of seamless steel pipe has be...