Seamless Steel Pipe

　　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 gas...

　　With different production process, we can get various types of steel pipe from seamless steel pipe, welded steel pipe like ERW steel pipe, SSAW steel pipe. Today we would like to introduce the standards introduction for SSAW steel pipe under the multifarious standards’ criterion. 　　Quality standard of SSAW steel pipe: 　　1. SY/T 5037 spiral submerged arc-welded steel pipe: pipelines of low pressure field service. 　　2. SY/T 5040 spiral submerged arc-welded steel pipe piles 　　3. CJ/T 3022 spiral submerged arc-welded steel pipe: used for municipal heal supply 　　4. IS: 1978 steel pipes will be used in transportation of oil, gas, and petroleum products. 　　5. ASTM A252 welded and seamless steel pipe piles. 　　Taking SSAW steel pipe EN 10217 / 10219 S235 from Threewaysteel Co.Ltd for example, it has the following characters for customer’s option: 　　Process:Spiral Submerged- Arc Welded Steel Pipe 　　Usage:Used for low pressure liquid delivery, such as water, gas, and oil; cons...

　　Alloy steel pipe is a kind of seamless steel tube, its performance is much higher than that of general seamless steel tube, because this kind of steel tube contains Cr, high temperature resistance, low temperature resistance, corrosion resistance and other non-pipe joint performance mismatch, 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 o...

　　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, grai...

　　Spiral pipe is a very widely used pipe, sometimes it may require welding, but spiral pipe exsit welding defects. 　　Under normal circumstances, weld defects of spiral pipe has porosity, undercut and crack phenomena. 　　Helical tube bubble defects: conducting spiral welded, in the center of the weld bead, there will be the situation of bubble defects, will produce this situation? Main reason is that, in the welding process is hydrogen bubbles form of residue inside the metal. How to solve this failure? Welding process, we need to clear weld the inside of the oil, water and other ingredients, but also need good drying and removing moisture, so that hydrogen does not remain inside the weld . Increasing the welding current in the welding process and the generation of the bubble can be avoided yet. 　　Spiral undercut: v-shaped groove weld edge, and along the weld centerline, said undercut. Usually undercut is inappropriate because of the current, voltage and welding speed, therefore, t...

　　Deformation sophisticated molds are often complex, but as long as we grasp its deformation law, the analysis of its causes, using different methods of prevention is to reduce the deformation of the mold, and it is able to control. In general, sophisticated molds heat deformation may take the following methods to prevent. 　　(1) A reasonable selection. Of sophisticated mold should choose a good micro deformation of steel material (such as air quenching steel), for carbide segregation serious mold steel should be reasonable and quenched forging heat treatment, larger and can not be solution forging die steels can double refined heat treatment. 　　(2) Die structure design should be reasonable, not too poor thickness, shape to symmetrical, to master molds for large deformation deformation law, set aside allowance for large, sophisticated molds can be combined structure. 　　(3) Sophisticated molds pre-heat treatment to eliminate residual stress generated during machining. 　　(4) A rea...

　　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 ...

　　Spiral welded steel tubes are widely used in oil, natural gas, water and other flammable & nonflammable liquid conveyance and distribution pipelines, steel structures for construction and other general purposes by means of their wide size range. 　　a. Molding process, the steel deformed uniformly, spiral steel tube, residual stress, the surface does not produce scratches. Spiral steel tube processing diameter and wall thickness in the range of sizes for greater flexibility, especially in the production of high grade thick-walled pipe, spiral steel tube, especially small and medium-diameter thick-walled tube has advantages over other processes, to meet user specifications in steel demand more. 　　b. The use of advanced double-sided submerged arc welding process, welding can be achieved in the best position, less prone to the wrong side, partial and incomplete penetration welding defects, easy to control weld quality. 　　c. 100% of the steel quality inspection, so that the whole...

　 　Technical requirements for spiral tubes 　　1. Manufacturing method 　　(1) The use of hot-rolled steel belt to do billet, often temperature spiral molding, spiral seam using automatic submerged arc welding, internal and external submerged arc welds are not less than one. 　　(2) Steel pipe on the allowable to the head of the weld, steel and the end of the pipe end of the distance of not less than 300mm. The purchaser negotiates with the manufacturer to allow the head weld to be at the pipe end, but there should be a circumferential distance of at least 150 mm between the head and the corresponding tube end screw candle. 　　(3) Docking pipe allows the same specifications and the same type of two short section of a steel pipe, each section of the length of short steel pipe shall not be less than 2m, both sides of the ring weld seam should be staggered, the ring distance Less than 150mm. 　 　2. The type of steel 　　The scope of the standard steel pipe should be used GB / T700-1988 ...

　　No matter which condition you’ve applied steel pipe, safety guarantee would be indispensable thing for all of us. As steel pipes suppliers, Xinyue Steel Group would have a basic introduction for quality control technology for steel pipe from seamless steel pipe to welded steel pipes. 　　1. Checking the wire and flux specifications correct or not is necessary. Under this situation, we can prohibit the problems caused by improper welding quality accidents. 　　2. Taking control of welding environment: we should count on the appropriate welding measures once the welding environment is not so good for the welding steel pipes, for example, the temperature below 0 degrees, relative humidity greater than 90%. 　　3. Figuring out is it right to choose the proper process parameters. Taking internal and external welding parameters for instance, we should make sure the rightful of the welding voltage and welding speed automatically during submerged arc welding. 　　 http://www.xysteelpipe.com/...

　　 SSAW steel pipe welding process, the welding of many factors, must be dynamically welding curve in space, but also for forming and welding adjusted higher, if adjusted properly, to avoid heat cracks to ensure the quality of pipe welding . 　　1. Molding from the following aspects should be adjusted to control: 　　First, it must ensure that the molding process parameters to calculate accurately, issued properly adjusted accurately place; second, fine adjustment controls the amount of deformation of the steel strip forming bending sufficiently to minimize the difference in the curvature of the delivery side of the free edge; Third, correctly adjusted welding pad roller height, avoid engaging point of local stress occurs too large. 　　2. Control the welding factors: 　　(1) Can not be used in the welding position in the welding uphill, downhill welding are actually present, because the spiral submerged arc welded pipes, solder joints within itself, not the main deformation zone, if ...

　　 SSAW steel pipe also has its own shortcomings, spiral steel hollow section is used as a large number of pipeline fluids, such as transportation of oil, natural gas, gas, water and some solid materials, pipes and so on. Compared to other steel and solid steel bar, the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle rack and construction using steel scaffolding. 　　Steel pipe manufacturing annular parts, can improve material utilization, simplify the manufacturing process, saving material and machining time, such as bearing rings, jack sets, has been widely used to make steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel would have to make steel. Pipe according to different cross-sectional shapes can be divided into tube and shaped tubes. Because in the perimeter of equal conditions, the la...

　　We can hear different opinions in steel pipe market for seamless steel pipe, ERW steel pipe, galvanized steel pipe and so on. Actually, according to the large categories, steel pipe is produced by two methods, which result in either seamless or welded products. 　　Seamless steel pipe, produced by solid round stock. First, it would be heated, then extruded which would lead to a hollow steel pipe. Of course, this can give us disparate products by different parameter in the steel which ranges from carbon seamless steel pipe to galvanized seamless steel pipe and so on. This kind of process would give the seamless steel pipe a smooth and even surface finish as well as the balanced stress taking. Thus, it is more reliable, and can result in products with much higher strength and integrity. 　　Welded pipe, for example, ERW steel pipe or SSAW steel pipe, is manufactured by steel sheets which are rolled for use. So they have welded joint which causes the uneven balance for the product compa...

　　When small-caliber seamless steel pipe are used, cracks may occur if they are not handled properly. If they are not discovered and repaired in time, there are serious risks. Therefore, we must strictly follow the construction specifications and process requirements related to indirect processes to operate, find out more realistic welding processes and review the quality of welding quality. If a crack problem still occurs under such circumstances, we can take the following measures to fix it: 　　(1) Welders who perform small-diameter seamless steel pipe repair must hold corresponding project certificate. And the quality of the welding staff is always good, and the repair must reach a qualified; 　　(2) Mechanical defects such as hand-held grinders can be used for the removal of weld defects. 　　(3) Repair of the welding method and welding parameters used must be performed in accordance with the relevant welding specifications; 　　(4) To take non-destructive testing means, check all...