LSAW Steel Pipe

Spiral pipe (SSAW) is a spiral seam carbon steel pipe made of strip steel coil as raw material, often warmly extruded, and welded by automatic double-wire double-sided submerged arc welding process. It is mainly used in water supply engineering, petrochemical, chemical, electric power, agricultural Fluid transportation in the fields of irrigation and municipal buildings: water supply, drainage, sewage treatment engineering, marine water transportation. For natural gas transportation: natural gas, steam, liquefied gas. Construction use: used for piling, bridges, docks, roads, buildings, offshore piling pipes, etc. There should be a certain channel between the stacking of the spiral welded pipe stacking equipment. The width of the inspection channel is generally about 0.5m. The width of the feeding channel depends on the size of the material and the transportation machinery, generally 1.5~2m. The stacking height of spiral steel pipes shall not exceed 1.2m for manual work, 1.5m for mechan...

 In the production process of spiral steel pipe, if the production process is unreasonable and the machine parameters are not properly set, there will be deviations, especially for large-diameter spiral steel pipes, which is often referred to as the wrong side phenomenon. During the production of spiral steel pipe, the wrong side occurs from time to time, and there are many influencing factors. In production practice, the steel pipe is often degraded because of the wrong side and out of tolerance. Therefore, it is very necessary to analyze the cause of the wrong side and its preventive measures. The following are the common reasons for the wrong side. 1. The sickle bend of the steel strip is the main factor causing the misalignment of the steel pipe. In the forming of the spiral welded pipe, the camber of the steel strip will continuously change the forming angle, resulting in the change of the weld gap, resulting in seam opening, misalignment or even overlapping. 2. When the exces...

The epidemic situation is constantly impacting the global economy. For the foreign trade industry, the epidemic situation greatly limits the visiting of new customers. At the same time, the demand for global inventory procurement is declining. Xinyue international business is devoting more efforts to support key projects of cooperative regular customers. In July, Australia's long-term partner project needs to purchase spiral steel pipe 406.4*9.53mm specification fixed length, standard AS1163 C350L0, impact requirements to meet 0 degree 27 J, delivery on schedule at the end of August. Xinyue exports nearly 10000 tons of Australian standard products every year. All departments are familiar with the raw material procurement channel, production technology link control, quality inspection and acceptance. This type of product is one of Xinyue's most advantageous products. Move Forward Hand In Hand And Win-Win Cooperation For quality control and logistics and transportation control, X...

    Common defects of spiral steel pipe welding zone     1. Bubbles     Most of the bubbles appear in the center of the weld, and the hydrogen is still hidden in the weld metal in the form of bubbles. The main reason is that there is moisture and flux on the surface of the welding wire, which can be used directly without drying. There is also a relatively large current during the welding process. It is small, the welding speed is too fast, and accelerated solidification of the metal may also occur.     2. Undercut     Undercut occurs along the center-line of the weld. V-grooves appear at the edge of the weld. The main reason is that the welding speed, current and voltage are not suitable. The welding speed is too high to be more suitable than the current welding speed. It is easy to cause undercut defects.     3. Hot crack     The cause of thermal cracking is when the welding stress is high or when the Si...

　　Spiral pipe stacked right help protect the quality of spiral steel pipe , spiral steel pipe prolong life, prevent deformation, erosion, so orderly stacking spiral steel pipe, but also conducive to late spiral pipe loading, inventory. Spiral Pipe buyers should also strictly in accordance with the requirements of spiral steel pipe pile. 　　1) Spiral pipe open dumps, following necessary pad with wood or stone, stack surface needs slightly tilted to facilitate drainage, and pay attention to the material placed flat to prevent the causing bending. 　　2) Spiral pipe principle requires stacking under palletizing firm to ensure the safety of the premise, to do according to species, palletizing specifications, different varieties of materials to palletizing respectively, to prevent muddy and mutual erosion, but also easy to install a library car. 　　3) Prohibit storage of steel aggressive action items in spiral steel pipe pile position around. 　　4) Spiral steel pipe pile bottom should be...

Such as spiral steel pipe weld gap is too large, the effect of cuts constituting nearby, eddy current lack of heat, weld crystal adverse indirect co-occurrence of cracks or lack of fusion; if the gap is too small, the effect is increased near constitute, excessive heat welding to form weld seam burning; perhaps weld by kneading, rolling after composing pit, affecting the quality of the weld surface of the tube is heated to a marginal two welding temperature, under kneading roll kneading, together constitute the metal grain mutual penetration, crystallization, ending spiral steel pipe welds constitute strong kneading force is too small if, together constitute the number of crystals is small, the weld metal strength decreases, cracking may occur after the force; If kneading excessive force will make the molten metal is extruded weld situation, not only reduces the weld strength, and the list will be a lot of glitches, and even take the welding seam constitute disadvantages.

　　The service life of spiral steel tube is mainly related to the operation environment and production technology. If the application environment of spiral steel pipe is poor, in order to prolong its service life, the outer wall and inner diameter of the steel pipe need to be treated with anticorrosion. 　　Coated spiral steel pipe refers to a steel pipe processed by anti-corrosion process, which can effectively prevent or slow down the corrosion phenomenon caused by chemical or electrochemical reaction during transportation and use. Coated spiral steel pipe can effectively prevent or slow down corrosion, prolong the service life of steel pipe and reduce the operation cost of steel pipe. 　　At present, the most widely used anti-corrosion methods for pipelines are 3PE composite structure, single-layer powder epoxy, PF type Cold-winding tape and RPC type Cold-winding tape. 　　1. Petroleum asphalt, with wide raw materials and low prices. However, the working conditions are poor, the qual...

　　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...

　　 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...

　　 SSAW steel pipe regularly appear quality problems in the production and use. So we need to identify the quality of SSAW steel pipe, in accordance with a certain way and performance testing, can be used in the actual use of an important role. Then how to identify fake spiral steel pipe method: there often are pimple phenomenon in appearance. In general, the overall effect of weighing will be better, mainly taking into account the cumulative error and probability theory of this problem. Pitted surface is due to the serious wear and tear caused by the uneven appearance of spiral steel pipe irregular irregular flaws. As the shoddy SSAW steel pipe manufacturers to pursue profits, often rolling the most rolling standard. Appearance easy to produce scar. 　　Poor quality SSAW steel pipe is easy to produce burrs, because some inferior manufacturers have tinpot equipment. Generally, burrs will scratch the appearance of SSAW steel pipe and is easy to fold, the tendons are thin and low. and o...

　　We know that the ports of spiral steel pipes should be round, affecting the installation and use of spiral steel pipes, but due to external factors and other factors, the spiral steel pipes become an ellipse, so spiral steel pipe manufacturers want to avoid such problems. 　　1. For spiral steel pipe manufacturers, attention should be paid to the quality of welding. It is impossible to have welding slag. High-quality wire flux is used. The technical parameters are determined according to the wall thickness of spiral steel pipe to ensure that the performance of spiral steel pipe is stable and not easily deformed. 　　2. When loading and unloading spiral steel pipes, it should be noted that the end of the spiral steel pipe should not be subjected to impact, such as collision with hard materials, or excessive force hitting the port during loading and unloading, which may also cause port deformation. 　　3. When storing spiral steel pipes, they cannot be stacked too high, and some large...

　　Production process of spiral steel pipe is complex, but it is one of the most popular steel pipes because it can be used widely. Spiral steel pipes are produced through welding process, then what issues should be noticed in the welding process? 　　Straight seam welded pipes are simple-produced with high efficiency, low cost and rapid developed. The strength of the spiral welded pipes is generally higher than that of seam welded pipes and narrow billet can be used to produce larger diameter welded pipes, besides, the same width billet can be used to produce welded pipes of different diameter. But compared with straight seam pipes of the same length, weld length increases by 30 ~ 100%, and production speed is lower. As a result, small diameter welded pipes mostly adopt straight seam welding, while large diameter welded pipes mostly adopt spiral welding. 　　Notes in the process of spiral steel pipe welding 　　From the aspect of economic benefit, pipe fittings of spiral steel pipes s...

　　The diameter of steel pipe can be divided into outer diameter, inner diameter and nominal diameter. 　　The outer diameter of the pipe with the antiseptic spiral steel pipe is denoted by letter D, followed by the size and wall thickness of the outer diameter. 　　For example, the anticorrosive spiral steel pipe with an outer diameter of 108 has a wall thickness of 5mm, which is expressed by D108*5. The plastic pipe is also expressed by the outer diameter, such as De63. Others such as reinforced concrete pipes, cast iron pipes, and galvanized pipes are indicated by DN. Design drawings are generally expressed in terms of nominal diameters. The nominal diameter is a standard that is conveniently and artificially specified for design, manufacture and maintenance. It is also a nominal diameter and is the specification name of a pipe (or pipe fitting). 　　The nominal diameter of the pipe is not equal to its inner diameter and outer diameter. 　　For example: a nominal diameter of 100MM sp...

　　Lamination defect control measures of spiral steel pipe is following below: 　　 1, to improve the toughness of plastic tube 　　Improve the cleanliness of molten steel, to reduce the harmful inclusions; increase the proportion of the slab crystal axis, to reduce the center segregation and center porosity; the use of reasonable cooling system to avoid cracks occur within the slab; billet or rolling slab to be taken offline slow cooling process, reduce internal stress, thus ensuring the microstructure and mechanical properties of the finished tube and pipe meet the technical standards. 　　 2, the reasonable control of the heating temperature 　　By measuring the thermoplastic curve, choose the best heating temperature. Note also that there is enough heating tube holding time, in order to reduce and improve plastic deformation resistance and toughness. 　　 3, lower roll speed 　　Roll speed is a key parameter piercing process, the roll speed from low to high variations in the process...

　　Generally speaking, hydraulic (pneumatic) part in planning the use of mechanical performance, data are assumed to be uniform, successive, isotropic, according to the analysis of this approach is safe and that the plan will sometimes spiral steel pipe unexpected trouble cracking attack. 　　Study found that the use of brittle cracking and also member of the relevant temperature. After discussions we found that when the temperature drops below a certain temperature, brittle materials will change the situation, the impact absorbed energy decreased, this representation is called cold crisp, high-strength metal resources guessed low stress brittle episodes cracking process, the data arrangement is far from uniform, isotropic. Arrangements have cracks, there will be inclusions, porosity and other drawbacks can be funded look into guessed microcracks. Therefore, even when the program based on the operating temperature of the member to choose a suitable cold brittle temperature change infor...

    Spiral welded steel pipes 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 pipe, residual stress, the surface does not produce scratches.Spiral steel pipe 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 pipe, 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 th...

    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...