SSAW Pipe

　　Coat-Plating Methods of Galvanized steel Pipes 　　Hot dip galvanizing can protect steel pipes very well. When zinc is in liquid state, plate the steel with a thick layer of pure zinc after the complicated physical and chemical interaction and thus will make the hot dip galvanizing come into being. Also a zinc and steel alloy layer will be generated during this process. With this kind of layer and corrosion resistance feature, galvanized pipes can be applied to different severe corrosion environments, such as strong acid, alkali frog, etc., which is incomparable to other electro galvanizing. 　　Advantages of hot dip zinc galvanized pipes： 　　First, in general atmosphere, a very thin and dense layer of zinc oxide will be formed on the surface of zinc coating. It is hard to dissolve in water, therefore plays a certain protective effect to steel substrate. So, if the surface of steel pipe is covered with a quite thick and dense pure zinc layer, the steel substrate will be protected fr...

　　 Hot Dip Galvanizing 　　Since the standard electrode potential of zinc is lost to iron, galvanized layers in water and humid air have sacrificial anodes to protect the steel base, which can greatly extend the service life of the steel. Commonly used in the industrial galvanized layer of hot-dip galvanized, electro-galvanized, mechanical galvanizing and thermal spraying (plating) zinc, which accounted for about 95% of the total amount of hot-dip galvanizing, Accounting for 40% of zinc production in the world, accounting for about 30% of China's zinc production. 　　 Hot dip galvanized steel pipe , stainless steel, cast iron and other metals immersed in molten liquid metal or alloy in a coating technology. Hot-dip galvanizing, also known as hot-dip galvanizing, is a method in which a steel member is immersed in a molten zinc solution to obtain a metal coating. With the rapid development of high-voltage transmission, transportation and communication, the requirements for the protec...

　　Galvanizing Pickling and Washing 　　1, pickling steel pipe: 　　1) pickling workers must wear good labor protection before work, at work to seriously check the work site has no barriers, harness is intact, to confirm the good before the work. 　　2) pickling Mainly pickling hydrochloric acid, the use of water to the preparation of hydrochloric acid, hydrochloric acid content of 18 to 20% more appropriate. 　　3) pickling work before the first understanding of the concentration of acid, temperature and the tank pickling pipe tonnage. 　　4) hanging pipe when the two harnesses to leave the end of the first 1.3 meters to prevent hanging bending pipe, resulting in galvanized steel pipe leakage; in the acid tank to the next tube, the pipe to tilt 15 °, the first stand under their own end to prevent spray Acid wounding. 　　5) Each pickling of steel pipe , the weight of 2 to 5 tons is appropriate, time 5 to 15 minutes. 　　6) steel pipe in the pickling to frequent vibration in the process...

　 　Uses of Welded pipe 　　1. General welded pipes are used for the transportation of generally lower pressure fluids such as water, gas, air, oil and heating steam. 　　2. Ordinary carbon steel wire casing pipe (GB3640-88) is a steel pipe used to protect electric wires in electrical installation projects such as industrial and civil construction, installation machinery and equipment. 　　3. Straight seam welded pipe (YB242-63) is a steel pipe whose weld is parallel to the longitudinal direction of the steel pipe. Usually divided into metric electric welded pipe, welded thin-walled pipe, transformer cooling oil pipe and so on. 　　4. Spiral-slit submerged arc welded pipe (SY5036-83) for pressurized fluid conveying is a hot-rolled steel strip coil for tube blank, which is often spiral-formed by a double-sided submerged arc welding method for spiral conveying of pressurized fluid. Seam steel pipe. The steel pipe has strong pressure bearing capacity and good welding performance. It is saf...

　　Surface striated defects are important indicators affecting the surface quality of cold-rolled products . It is very difficult to solve the problem of surface ridges in many cold rolling mills in China, especially galvanizing units and continuous retreating units. The cause and solution of surface grain defects are an important part of the development of high-end cold-rolled product production technology. 　　How is the surface grain pattern formed? When the strip is subjected to a sudden transition from the elastic zone to the plastic zone by the stress exceeding the yield limit, due to the effect of the yielding platform, unevenness and local flow deformation will occur on the strip section, and the surface yielding transverse stripes will occur. The microscopic cause is due to the "nail anchor" effect of the Kodak air mass. When the solute atoms interact elastically with dislocations, they eccentrically gather around the dislocations to form a so-called "Kod's a...

　　 Steel pipes are the most widely used pipes in urban gas projects. Its main advantages are: high strength, good toughness, large load bearing stress, good impact resistance and tightness, good plasticity, easy welding and hot processing, thin wall thickness and metal saving. However, its corrosion resistance is poor and proper anti-corrosion measures are required. The steel pipes used in gas engineering are generally made of high quality low carbon steel (generally referred to as Q235B) or low alloy steel (generally referred to as Q345B). 　　1. Material selection of steel pipes 　　The steel pipes used for urban gas pipelines mainly include two types of seamless steel pipes and welded steel pipes. The strength of seamless steel tubes is very high, but limited by the production process and cost, it is generally small diameter steel pipes below DN200. There are many types of welded steel pipes, which can be divided into straight seam welded steel pipes (LSAW) and spiral seam welded s...

　　There is a certain relationship between the service life of the spiral steel pipe and the surface decarburization of the spiral pipe. If the surface is decarburized, the strength and wear resistance of the spiral steel pipe will be reduced, which directly affects the service life of the spiral steel pipe. If the decarburized layer on the spiral pipe is not cleaned, the surface layer hardness and wear resistance of the spiral steel pipe will be correspondingly reduced, and in the process of quenching, the surface of the workpiece will be caused by the change of the volume of the inner and outer layers. A crack is formed. 　　In order to solve the decarburization problem of the surface, the heat treatment process is mainly processed because the decarburization and the oxidation of the spiral steel pipe are simultaneously performed. Therefore, in the process of heat treatment, the spiral steel pipe should not be in contact with the air as much as possible. This can improve the phenomeno...

　　How to Control the Position of High-frequency Induction Coil of High Frequency Straight Seam Welded: 　　1.The excitation frequency of the high-frequency straight seam welded pipe is inversely proportional to the square root of the capacitance and inductance in the excitation circuit, or to the square root of the voltage and current, and the magnitude of the excitation frequency can be changed by changing the capacitance, inductance or voltage in the circuit. to achieve the purpose of controlling the welding temperature. For mild steel, welding temperature control in 1250 ~ 1460 ℃, to meet the pipe wall thickness of 3 ~ 5mm penetration requirements. In addition, the welding temperature can also be achieved by adjusting the welding speed. 　　2,High-frequency induction coil should be close to squeeze roller position. If the induction coil is located farther away from the squeeze roller, the effective heating time is longer, the heat affected zone is wider, and the weld strength is de...

　　After the production of SSAW steel pipe , it should be stored.If we don’t do some measures to keep its stability, it will rust and be corroded. So we will talk about how to increase the stability of the spiral welded pipe today. Generally speaking, we have followed methods: 　　1. Small and medium-sized steel, wire rod, rebar, steel pipe with medium diameter, wire and wire rope, etc., can be stored in well-ventilated shed, but must put covering in the upper part of the goods and underlay at the bottom of the goods. 　　2. Some small steel shape, sheet steel, steel strip, silicon steel sheet, small diameter or thin-walled steel pipe, all kinds of cold-rolled or cold-drawn steel and the metal products with high prices and easy-to-corrode can be stored in warehouse. 　　3. The ground or warehouse to store spiral steel pipe should choose the place where is orderly and clean, and it is easy to fluently drain away water. It should stay away from the factories and mines that products harmfu...

　　The technology of welded steel pipe is continuous online production. So the thicker the wall thickness is, the greater the investment in the unit and welding equipment is, and welded steel pipe will have less economical efficiency and practical applicability. The wall thickness is thinner, its input-output ratio will be decreased accordingly. The process of the product determines its advantages and disadvantages. In general, the welded steel pipe with high precision, uniform wall thickness, high brightness of tube inside and outside (surface grade of steel plate determines the surface brightness of steel pipe), can be fixed length wilfully. Therefore, welded steel pipe reflects its economy and aesthetics in the high-precision, low-pressure fluid applications. 　　The production process of welded steel pipe is simple, the production efficiency is high, the cost is low, and develops rapidly. The strength of the spiral welded pipe is generally higher than that of the straight seam weld...

　　 SSAW steel pipe refers to the metal pipe with spiral seam that using submerged arc welding process to weld. There are complete production line of SSAW steel pipe in Prime Steel Pipe, we are positioned as a steel pipe manufacturer and exporter for spiral welded pipe. If there is a need, please contact us without hesitation, we will do our best to meet your requirement. 　　Submerged arc welding (including submerged arc welding and electroslag welding, etc.), its full name is submerged automatic arc welding, it is a kind of method that arc burns under the flux layer to weld. Its inherent advantages (including stable welding quality, high welding productivity, no arc and few dust, etc.) makes it become the main welding methods used in pressure vessel, pipe section manufacturing, box beam and other important steel structure production. 　　Advantages of SSAW steel pipe: 　　1. High production efficiency. On the one hand, the wire length is shortened, the current and current density are...

　　 LSAW steel pipe manufacturing process is simple, its production efficiency is high and at low cost, the development of straight seam welded pipe is rapid. Therefore, the straight welding is mostly used in smaller diameter of steel pipe. Today, as an excellent steel pipe manufacturer, Prime Steel Pipe will share the LSAW steel pipe manufacturing process in details for all of you. 　　LSAW steel pipe Manufacturing process: 　　1.Plate Analyzing：After the steel plate used to manufacture large diameter LSAW steel pipe entering into the production line, steel pipe manufacturer should carry out ultrasonic testing to the whole plate; 　　2.Edge Milling: Through the milling machine to carry out double-sided milling on both sides of the steel plate, to make it achieve the required plate width, board parallelism and groove shape; 　　3.Edge Crimping: Using the pre-bending machine to preliminary rolling, so that the board has the required curvature; 　　4.Molding: In the JCO forming machine A...

　　High frequency electric resistance welded pipe, also known as ERW steel pipe . ERW has many advantages, such as high production efficiency, low-cost, saving in material, and easy-to-automation. It is a kind of important welding technology which is widely used in various industrial sectors such as aviation, energy, electricity, automobile, light industry and so on. 　　ERW steel pipe uses hot rolled coil as raw material, its wall thickness is uniform and is controlled at ± 0.2mm or so, the two ends of the pipe should repair the end, bevel, and cut to length according to the United States APl standard or GB/T.1 standard. Compared with the submerged arc welding process, ERW welding process does not add any welding materials, weld molding has not been hot-melting state, the weld metal goes through the recrystallization process, so the formed weld is completely the same chemistry as the base metal. The steel pipe after welding will be annealing, manufacturing cold forming internal stress,...

　　Longitudinal Submerged Arc Welded Pipe or simply LSAW steel pipe and Straight Seam Submerged Arc Welded Pipe or simply SSAW steel pipe belong to submerged-arc welding (SAW). But LSAW steel pipe adopts single steel sheet as raw material, its advantages include: the thickness of the steel plate can reach more than 100mm, and there is no crescent bends; since it is straight seam, forming is more convenient, but also it is easy to weld tracking, which is suitable for two-step pre-precision welding production; and there is the whole body of mechanical expansion process, which can basically eliminate the residual stress. All of advantages above make LSAW can be produced big diameter steel pipe (the maximum can reach 1422mm), high-grade pipe (50mm), high steel grade (X80/X100/X120), and large structure tube that used in two, three, four types of regional and marine engineering. LSAW steel pipe and high-frequency Longitudinal Welded Pipe (HFW steel pipe) all belong to Longitudinal Welded Pi...

　　Precision welded pipe is a broad concept, according to the different use requirement, there are many different personalized quality requirements. Precision welded pipe is the further improved result that based on the general welded steel pipe, is the fine products in the welded steel pipe products. Prime Steel Pipe as the comprehensive steel pipe manufacturer and exporter from China, has been committed to provides high-quality steel pipe for sale, if you have any requirement of precision welded pipe, please contact us. 　 　Key Features of Precision Welded Pipe 　　Precision welded pipe has a fine geometric size, thickness of the transverse wall is uniform, shape of steel pipe is good, oval is small, the quality of welding line is good and burrs are small, the outer surface is smooth. Steel pipe after welding line heat treatment or protective atmosphere heat treatment, can achieve the effect of surface without oxygen, steady mechanical properties and metallurgical uniform. Its produc...

　　Usually people think that the magnet absorbs the stainless steel tube, verify its pros and cons and the authenticity. if it does not attract non-magnetic, then we think it is good material and genuine; On the contrary, the sucker has magnetic, it is considered a counterfeit fake. In fact, this is an extremely one-sided, unrealistic way of distinguishing mistakes. 　　There are many types of stainless steel tubes, which can be divided into several categories according to the structure at room temperature: 　　1. Austenitic type: such as 304, 321, 316, 310, etc.; 　　2. Martensite or ferrite: such as 430, 420, 410, etc.; 　　Austenite is non-magnetic or weakly magnetic, martensite or ferrite is magnetic. 　　Usually used as a decorative stainless steel tube is mostly austenite 304 material, generally it's non-magnetic or weak magnetic. Due to chemical composition fluctuations or processing conditions, it may also occur magnetic, but this can not be considered as a counterfeit or fa...

　　Black steel pipe and galvanized steel pipe have several respects similar to each other, such as they are common kind of pipe applied to transport liquid and gas, so there are many people can't distinguish them clearly. 　　The main difference between black steel pipe and galvanized steel pipe: 　　Black steel pipe and galvanized pipe all use steel as raw material. And general speaking, galvanized steel pipe is more expensive and more durable since galvanized pipe has a zinc coating while black pipe does not. Galvanized pipe covered with a layer of zinc which makes it have higher ability of corrosion protection and help to prevent the accumulation of mineral deposits that will block the pipe.This will lead to a burst. So galvanized steel pipe is more suitable for carrying water instead of gas. 　　For transportation, galvanized pipe is mainly used for carrying water to supply home and commercial buildings. It is also serve as scaffolding frames because of its rust prevention. Bla...

　　The advantage of high-frequency Longitudinal Welded Pipe ( commonly abbreviated as HFW steel pipe ), some people also all it as ERW steel pipe is that it has heat treatment after welding, can eliminate the welding line and the residual stress in the heat affected zone, refine the grain and strengthen the mechanical properties. Making full use of and expanding this advantage, pipe manufacturer (such as Prime Steel Pipe) can improve product quality and develop new products. Such as Baosteel HFW610 unit, Zhejiang CNOOC Jinzhou oil steel pipe HFW630 unit, Wuhan Iron and Steel Wuhan Jiangbei HFW660 unit, Bohai equipment Dagang oilfield new century HFW245 unit and PetroChina Baoji oil steel pipe SEW unit develops high quality oil special tube, marine pipeline, oil casing and slurry Pipeline and so on all illustrate the trend. 　　For the HFW unit, the larger diameter will even more be limited by the weight of the strip material and the wall thickness. The storage equipment is limited by th...