LSAW Steel Pipe

    A discarded, rust spiral welded pipe on the road evokes my contemplate that it is used as deep foundation solutions in deep sea oil exploration, hurricane protection, water and oil transportation projects in the whole wold. It likes our foundations silently to support our life.     Among the life with various steel pipes, spiral welded pipe often plays an essential role in the overall reliability of many structures. They are often unnoticeable to public though, there are multifarious applications for steel pipes foundations. The most common use for steel pipes is to have them transfer soil mass that lacks enough capacity to support the load to a deeper soil that can adequately tolerate the load against a sliding, bearing, or uplift type of failure.     We can feel something when we walk on the road as sometimes we can see some engineers are working when they excavate the road to repair or reload some new steel pipes under the road. This is the power...

    A saying goes that he is in charge of his government. So does for various pipes too. Taking seamless steel pipe for example, we know that different thickness of the steel pipe would have different environment to use.     High-pressure seamless steel pipe (GB6479-2000)for fertilizer plant would be high-quality carbon structural steel and alloy steel seamless pipe which are suitable in working temperature of -40 ~ 400 ℃ and working pressure of 10 ~ 30Ma.     Petroleum cracking seamless steel pipe (GB9948-2006) is suitable for oil refinery furnace tubes, heat exchanges pipe.     Geological drilling steel pipe (YB235-70) for the geological department is made by core drilling steel pipe. According to the use, it can be divided into drill pipe, drill collars, core pipe, casing and pipe and so on.     Diamond core drilling seamless steel pipe (GB3423-82) is used for diamond core drilling drill pipe, core rod, casing seamless steel p...

    First, the spiral pipe thermal expansion method     Bulging method     One is placed in the tube of rubber, the top with a punch compression, so that the pipe protruding forming; the other method is hydraulic bulge forming, the middle of the tube filled with liquid, the liquid pressure drum into the desired shape, the bellows Most of the production is using this method.     2 forging method     With a forging machine to be part of the end of the pipe to punch, so that the outer diameter to reduce the commonly used forging machine rotary, connecting rod, roller type.     3. Bending forming method     There are three methods are more commonly used, a method called extension method, the other method is called stamping method, the third wheel method, there are 3-4 rolls, two fixed rolls, a roll adjustment, fixed roll distance, finished tube It is curved.     4 stamping method    ...

    1, steel forming process, steel deformation, residual stress is small, the surface does not produce scratches. Processed steel pipe in the diameter and wall thickness of steel pipe size specifications range, greater flexibility, especially in the production of high steel grade thick-walled steel pipe, especially large diameter thick-walled pipe with other processes have unmatched advantages that meet Users in the pipe specifications more requirements;     2, the use of pre-welding after welding (welding) process, can be achieved in the best location of the welding, not prone to wrong side, partial welding and incomplete penetration defects, easy to control the quality of welding;     3, the overall mechanical expansion, which can effectively improve the dimensional accuracy of steel pipe, and improve the distribution of stress in the steel pipe, so as to avoid damage caused by stress corrosion, and is conducive to the site of the welding constructio...

    (1) For pipelines with high requirement for peak regulation, due to the uneven gas consumption of users and the frequent fluctuation of pipeline pressure, the alternating stress that steel pipe is subjected to is large. Existing defects in pipe materials will expand under alternating stress. If Selection of weld, defect probability of spiral welded steel pipe, the safe operation of the pipeline will not be guaranteed.     (2) Pipeline passes through the seismic fault zone or through the local high-intensity seismic area. Due to the frequent geological activities in these areas, longitudinal or axial alternating stress will be generated on the pipeline. Under the long-term stress, the probability of accidental spiral welded steel pipe is much higher than that of LSAW steel pipe. Therefore, in this zone, the straight Submerged arc welded pipe.     (3) For pipes with high requirements for inner and outer coating, LSAW steel pipes shall be adopted. Spir...

    We all know that there are high demands for seamless steel pipe when they are applied for the oil and gas transportation. However, we should figure out the basic drawbacks for the whole quality of the steel pipes so that we can choose the right one for our daily life usage.     Sickle bend, wave-shaped, longitudinal nibbling would be some common drawbacks for steel pipes due to the incorrect production methods. Sickle bend and wavy usually appear in the cold-rolled strip rolling process, which is formed by the control of the amount of rolling down properly. In the pipe forming process, the sickle bend and wavy strip will lead to the deviation or overturning, thus the simple weld weld occurs, and it finally affect the impact of pipe quality. The bite of the strip (for example, the jagged edge of the strip) is usually present on the slitting strip because of the blunt or unscrupulous slitting of the slitting disk blade. Because of the bite of the strip, there is ...

    It is no doubt that we need to repair our pipes of water or gas transportation sometimes. However, do you know the space available for different pipe’s repairing? Like the ERW steel pipe from manufacturer?     This is really very important before your repairing. There are some examples for your reference if you just need to repair. If you are repairing a pipe, and it is under 2 inch nominal dimension. Under this situation, taking pressure of the pipe into consideration, you do not need more than 300 psi pressure, and style 65 or style 90 may be your best choice. In addition, if you are repairing a gas line or oil line, due to the high pressure for transportation of oil and gas, editor thinks that style 90 universal coupling is very popular to repair gas lines. Of course, there are for steel pipes, if you are repairing a PVC or PE pipe or any combination of steel and PVC/PE pipe, style 90 universal coupling has a lock ring to prevent from pipe pull out.  ...

    During the station construction of gas and oil pipelines, valves, instrument and flanges installation requires tapping in the main pipeline. It is hardly to identify visually the base pipe straight seam location of high frequency electric resistance welding. Some boss mounting positions are very close to electric welding pipe seam. Hence, it is very necessary to study the deep research and analysis for the boss installation influence on the base pipeline. The paper analyses the residual stress distribution on the high frequency straight seam resistance welding pipeline by hole drilling, and original residual stress impact about the different boss welding positions on erw pipe. There is a sharp rise in stress and the longitudinal weld residual stress impact after the boss installation on the erw pipe is much larger than the mother pipeline.     The distribution of residual stress in erw pipe is closely related to its welding and forming process. HFW resistance w...

    Helical submerged arc welding (spiral) steel pipe is the full name of hsaw pipe, to the strip into the welded pipe unit, the multi-roll rolling, the strip gradually rolled up to form a circular tube with an open gap, adjust the reduction of squeezing roller so that the weld gap control in 1 ~ 3mm, and make both ends of the weld flush. Spiral welded pipe is formed by forming the material strip spiral molding, through internal and external submerged arc welding, thus producing different specifications of the spiral welded pipe.     Helical submerged arc welding (spiral) steel pipe has many advantages over other welded pipe:     (A)The pipe has two overlapping inner and outer spiral weld, play a role in increasing the rigidity, bearing pressure also increased accordingly.     (B)The use of submerged arc welding process, slag protection effect. Therefore, it has good impact toughness and low temperature performance.     (C)The us...

    It is no doubt that we need to repair our pipes of water or gas transportation sometimes. However, do you know the space available for different pipe’s repairing? Like the ERW steel pipe from manufacturer?     This is really very important before your repairing. There are some examples for your reference if you just need to repair. If you are repairing a pipe, and it is under 2 inch nominal dimension. Under this situation, taking pressure of the pipe into consideration, you do not need more than 300 psi pressure, and style 65 or style 90 may be your best choice. In addition, if you are repairing a gas line or oil line, due to the high pressure for transportation of oil and gas, editor thinks that style 90 universal coupling is very popular to repair gas lines. Of course, there are for steel pipes, if you are repairing a PVC or PE pipe or any combination of steel and PVC/PE pipe, style 90 universal coupling has a lock ring to prevent from pipe pull out.  ...

    Considering the factors affecting the welded steel pipe, manufacturers should take original materials in control. Then for the production of ERW steel pipe, how's the influence of the mechanical properties to the quality of this kind of steel pipe?     The common steel would be carbon structural steel for the production of welded steel pipe, and the main grades would be Q195, Q215, Q235 SPCC SS400 SPHC and so on. The formation of steel forming would be difficult, especially for wall thickness steel pipes because of the high steel yield point and tensile strength.It would cause cracks for the welded steel pipes. For example, when the tensile strength of the strip exceeds 635 MPa, and the elongation is less than 10%, the weld seam is easily cracked during the welding process.     It is our responsibility to think twice about the tensile strength when we need the relative original materials for the production of the welded steel pipe.     h...

    LSAW pipe fracture, hydraulic (pneumatic) parts used in the design of mechanical properties, brittle fracture is also related to the use of components temperature.     It has been found through research that when the temperature is lower than a certain temperature value, it is found that the data will change into a brittle state and the impact absorption power will obviously drop. This phenomenon is called low-stress brittle fracture in cold-brittle and high-strength metal materials in the process, there are cracks in the heterogeneous isotropic tissue in the data organization, as well as defects such as inclusions and pores. All of these defects can be regarded as microcracks in the material. Therefore, the design time also based on the components of the working temperature to select the right cold brittle transition temperature data.     Generally assume that the data is uniform and continuous isotropic according to this method of analysis is cons...

    General chemical heat treatment of erw casing, such as carburizing, carbonitriding, carbon and nitrogen boron infiltration, respectively, are additional single component, two components and three components of the multi-parameter heat treatment.     In recent years, but also the development of a number of new technology using the erw casing chemical heat treatment, such as vacuum chemical heat treatment, fluid bed chemical heat treatment, ion osmosis metal, ion implantation, laser surface alloying, etc., can improve the erw casing wear Loss of corrosion resistance and other performance. Rare earth in the application of chemical heat treatment (ie, with rare earth infiltration), can significantly improve the rate of seepage, shorten the treatment cycle, and can improve the wear resistance and corrosion resistance of the layer, which is a major feature of our country.     In addition, the erw casing solid solution chemical heat treatment is also a no...

    Differences in manufacturing process:     Galvanized steel pipe and seamless steel pipe is two kinds of steel pipe, galvanized steel pipe surface is galvanized, there may be welded pipe, it may be seamless pipe, seamless steel pipe refers to the manufacturing process, Seamlessly Galvanized pipe corrosion-resistant, seamless steel pipe can withstand higher pressure. Galvanized steel pipe due to the protection of zinc, not easy to rust, galvanized steel pipe than the seamless steel pipe, if it is used for the balcony, it is best to use galvanized light pipe, seamless steel pipe is not suitable for use on the balcony, due to the seamless steel pipe wall thickness, natural weight on the heavy, and the cost of seamless steel pipe than the cost of galvanized steel pipe is high, there are galvanized steel pipe is very durable, the service life is far more than seamless steel pipe. If the quality is excellent, the use of more than 20 years should not be a problem, of...

    The main production process of high pressure pipe: tube and blank heating, tube perforation, the extension of steel.     High-pressure pipe rolling, steel pipe diameter and diameter reduction, steel pipe cooling and finishing or can be said that the steel embryo heating perforation, heat pickling, pickling, cold-drawn carbon burn, head, spray standard, packaging, a seamless steel pipe manufacturing method characterized in that a rolling mill base having a plurality of rolls is provided, and a plurality of mandrel-type seamless tube rolling stands are continuously arranged in mutually different rolling directions, and the seamless steel pipe is rolled on such a manufacturing line And at least the wall thickness of the steel pipe in the circumferential direction of the rolled steel pipe is measured at a plurality of points, and at least the two ends of the respective rolls on the final rolling stand of the mandrel mill are controlled according to the measurement ...

    In the past 20 years, the structure of steel pipe has been developed rapidly at home and abroad. It has been widely used in modern industrial buildings, warehouses, gymnasiums, exhibition halls, venues, terminals, stations and office buildings, hotels and other buildings. Because of its good performance, more and more widely used at home and abroad. Pipe structure from the structure can be divided into beam structure, arch structure. From the layout can be divided into planar tube structure and space tube structure. Mainly used in two cross-section of the tube: tube and square tube. The pipe is connected to the pipe through the intersecting weld, since the treatment makes the structure more neat and beautiful. Pipe structure and the combination of cable formed by the mixed structure of the system, such as the aforementioned beam string structure to give full play to the superiority of different materials or components, is the future structure of the development of a direct...

    Municipal water supply pipe , spiral steel pipe in addition to outside the anti-corrosion, the need for internal anti-corrosion disposal. At that time the most use of cement mortar fabric corrosion, the method is evenly coated in the steel pipe wall layer of cement mortar leaving the pipeline to be protected. Cement mortar within the coating can not only avoid the corrosion of the inner wall of the pipeline, extending the use of pipeline life, and to protect the water quality, adhere to or improve the pipeline water supply, with significant economic and social benefits.     Spiral steel pipe to do the common sense of cement mortar inside the coating as follows:     (1) Spiral steel pipe material required     Cement should use more than 42.5 grade grade silicate, usually Portland cement or slag Portland cement. Sand should be used to consolidate, clean, graded with excellent natural sand, no debris, the amount of its blur is not greater t...

    FBE anti-corrosion tube is nearly 30 years to develop a new type of coating, the use of electrostatic spraying process coated epoxy powder coating, a film. The coating has the advantages of simple coating operation, no pollution, good impact resistance and bending resistance, and high temperature and high resistance. It has been widely used in foreign countries.     The raw materials of FBE coating from solid-state epoxy resin, curing agent and a variety of additives by mixing, crushing and processing, is a thermosetting material. When the coating is applied, the steel pipe is heated to 220-230 ° C, and the surface of the steel pipe is sprayed on the surface of the steel pipe by electrostatic adsorption coating method. The hot melt is bonded and cooled and solidified. Single layer FBE coating thickness of 300-500um; double FBE thickness is generally controlled at 450-1000um. FBE coating has excellent adhesion, high insulation, anti-soil stress, anti-aging, anti...

    FBE anti-corrosion tube is nearly 30 years to develop a new type of coating, the use of electrostatic spraying process coated epoxy powder coating, a film. The coating has the advantages of simple coating operation, no pollution, good impact resistance and bending resistance, and high temperature and high resistance. It has been widely used in foreign countries.     The raw materials of FBE coating from solid-state epoxy resin, curing agent and a variety of additives by mixing, crushing and processing, is a thermosetting material. When the coating is applied, the steel pipe is heated to 220-230 ° C, and the surface of the steel pipe is sprayed on the surface of the steel pipe by electrostatic adsorption coating method. The hot melt is bonded and cooled and solidified. Single layer FBE coating thickness of 300-500um; double FBE thickness is generally controlled at 450-1000um. FBE coating has excellent adhesion, high insulation, anti-soil stress, anti-aging, anti...

    FBE anti-corrosion tube is nearly 30 years to develop a new type of coating, the use of electrostatic spraying process coated epoxy powder coating, a film. The coating has the advantages of simple coating operation, no pollution, good impact resistance and bending resistance, and high temperature and high resistance. It has been widely used in foreign countries.     The raw materials of FBE coating from solid-state epoxy resin, curing agent and a variety of additives by mixing, crushing and processing, is a thermosetting material. When the coating is applied, the steel pipe is heated to 220-230 ° C, and the surface of the steel pipe is sprayed on the surface of the steel pipe by electrostatic adsorption coating method. The hot melt is bonded and cooled and solidified. Single layer FBE coating thickness of 300-500um; double FBE thickness is generally controlled at 450-1000um. FBE coating has excellent adhesion, high insulation, anti-soil stress, anti-aging, anti...

    The process of high-frequency welded pipe production depends on the product variety, from raw materials to finished products need to go through a series of processes, the completion of these processes require a variety of mechanical equipment and welding, electrical control, detection devices, these devices and devices in accordance with different processes with a variety of reasonable layout of the process, high-frequency welded pipe typical process: open book - strip leveling - head and tail shear - steel butt welding - live storage - forming - welding - remove the burr - sizing - initial inspection - straightening of pipe - pipe section processing - water pressure test - flaw detection - printing and coating - finished product.     High-frequency welding is the use of continuous contact with the workpiece surface of the high-frequency current generated by the heat generated by heating and in the case of the application of forging force, the workpiece metal t...

    It is time for us to start the preheat since manufacturers have known the benefits of preheating for welded steel pipe like the ERW steel pipe. There are two main methods for customers to get today.     Common method is preheating with an open flame from a torch. This method is easy to get and apply, of course, it would supply simple setup and portability for manufacturers with the low initial investment cost. Editor knows that majority of us would know this way. Due to much of the heat would lost into surrounding air with the open flame method sot it seems like inefficient compared to other better options which we will talk later.     Induction heating would be a better one than open flame for preheating. It provides safe option for preheating so it has been applied in pipe welding. It also offers benefits for other part geometries, including flat plates for structural steel applications, as well as for shrink-fit applications.     Xiny...

    New houses have mushroomed on the edge of the town and new suburbs burgeoned all around the city. At the same time, we can see the application prospect of the spiral welded pipe with those expansion of engineering project.     Why spiral welded pipe? Due to its safe, reliable, environmental friendly, economical, applicable, of course, of course, good price, it is popular among customers and is widely used in every industry from building engineering project to car industry. First, we can figure out that the special wall of the pipeline and the new reliable, simple and convenient connection method have been developed successfully. With the more irreplaceable benefits than other pipes not only from the price, it would be used more and more in our daily life's project. Spiral welded pipe is an economical section steel, and it is an important product in iron and steel industry.     Of course, as supplier of steel pipe, we can also provide you with seamle...