LSAW Steel Pipe

 Welded pipe, also known as welded steel pipe, is basically made of steel plates or steel strips that are curled and welded. The production process of welded steel pipes is simple, the production efficiency is high, there are many varieties and specifications, and less equipment, but its general strength is lower than that of seamless steel pipes. Since the 1930s, with the rapid development of high-quality strip rolling production and the advancement of welding inspection technology, the quality of welds has continued to improve, the varieties and specifications of welded steel pipes have increased, and seamless steel pipes have been used in more and more fields. replaced. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes according to the weld form. 1. Single radius forming method of welded steel pipe There are three single-radius roll forming methods: circumferential bending forming method, edge bending forming method and center bending forming...

Submerged arc welded steel pipe (LSAW pipe or SSAW pipe) weld surface indentation refers to a weld defect in which the weld surface is partially lower than the normal surface of the weld, and is a common weld surface defect in submerged arc welding. In the production of submerged arc welded steel pipes, the weld seam is usually relatively long. Especially in the production of one-step spiral submerged arc welded steel pipes, it is often the case that thousands of meters of submerged arc welds are welded at one time, so it is relatively easy to produce pits on the surface of the weld. Hazards of indentation on weld surface 1. If the depth of the indentation on the surface of the weld is > 1.5mm, it must be treated as a weld defect. Once a steel pipe has several weld pits lower than the base metal, it is easy to cause the steel pipe to be degraded or even scrapped, and at least it will increase the repair cost of the steel pipe production. 2. Due to the wide application of 3PE externa...

EN 10025-4 is a European standard for structural steel products. It specifies technical delivery conditions for flat and long products of hot rolled weldable fine grain structural steels in the thermomechanical rolled condition. This standard is widely recognized in the European market and has been adopted by many steel manufacturers, including Xinyue Steel. Xinyue Steel’s EN 10025-4 welded steel pipe is a high-quality and reliable product that has been widely used in various industries in Europe. With its excellent mechanical properties, weldability, and toughness, it has become a preferred choice for many customers. One of the key advantages of Xinyue Steel’s EN 10025-4 welded steel pipe is its durability. Made from high-grade steel, the pipe is designed to withstand extreme weather conditions, corrosion, and other harsh elements, making it ideal for use in various applications in the European market. Additionally, the pipe’s high-strength properties make it resistant to deformation,...

Xinyue Steel is a leading manufacturer and supplier of black welded steel pipes in China, catering to various industries such as construction, transportation, and infrastructure. Black welded steel pipes are widely used due to their durability, strength, and versatility. In this article, we will delve into the applications of Xinyue Steel’s black welded steel pipe and explore how it is revolutionizing various industries. Applications: Construction: Xinyue Steel’s black welded steel pipes are extensively used in the construction industry for structural applications such as building frames, bridges, and tunnels. The pipes’ strength and durability make them a preferred choice for architects and engineers. The pipes can be easily welded, cut, and drilled, allowing for customized applications in construction projects. Transportation: Black welded steel pipes are also used in the transportation industry for the manufacture of vehicle parts such as exhaust systems, suspension components, and ...

　　Cold drawn erw steel pipe, which is one of the best choices for the production of multi-stage hydraulic cylinders. Its process is the same as that of precision seamless pipe cold drawing. It is precision drawn by precision resistance welding (ERW) and manufactured with EN. 10305-2 EU mechanical cold drawn carbon steel welded pipe standard. 　　After the electric resistance welded pipe is welded, the whole pipe body is normalized to ensure the homogeneity of the weld and the heat affected zone with the rest of the metallographic structure and mechanical properties; cold drawing and subsequent heat treatment (eliminating internal stress) and the steel pipe have good dimensions. And mechanical properties. 　　After the welded steel pipe is processed by cold drawing and deep processing, a high-quality steel pipe with small dimensional tolerance and good mechanical properties is obtained. 　　In addition, cold drawn welded pipes have significant advantages over cold drawn seamless pipes i...

　　Welded steel pipes are steel pipes made by bending and forming steel plates or steel strips. The production process of welded steel pipe is simple, the production efficiency is high, the types are standard, and the equipment is less invested, but the general strength is lower than that of seamless steel pipe . Since the 20th century, with the rapid development of high-quality strip continuous rolling and the advancement of welding and inspection skills, the quality of welds has been continuously improved, the types of welded steel pipes have become more and more standard, and more and more areas have replaced seamless Steel Pipe. Welded steel pipes are divided into straight welded pipes and spiral welded pipes by way of welds. Straight seam welded pipe production process is simple, high production efficiency, low cost, and faster development. The strength of the spiral welded pipe is generally higher than that of the straight welded pipe. It is possible to produce a welded pipe with ...

　　Select of Straight Seam Submerged Arc Welded Steel Pipe 　　(1) For high peak load requirements of the pipeline, because the user's gas consumption is very uneven, pipeline pressure fluctuations in the frequent, alternating stress steel to withstand large tubing will expand the existing defects in alternating stress, if more choice weld defects high probability of spiral welded steel pipe, the safe operation of the pipeline will not be guaranteed. 　　(2) Pipeline crossing earthquake fault or by topical highly seismic region, due to the geological activity of these lots frequent pipeline will have a vertical or axial alternating stresses. Spiral weld much higher than the probability of defect LSAW steel pipe, under long-term stress, spiral welded steel pipe is much higher than the probability of an accident LSAW steel pipe , therefore, in such areas should be used straight submerged arc welded pipe. 　　(3) Internal and external coating requires a high piping should be used LSAW....

　　The seamless steel pipe and the welded steel pipe have a weld bead on the inner wall of the welded pipe, and are seamless. 　　The seamless pipe pressure is higher, the welded pipe is generally about 10 MPa, and now the welded pipe has been seamlessly processed. Seamless steel tubes are formed at one time during rolling. 　　Welded steel pipes need to be welded after rolling, generally with spiral welding and straight welding.The performance seamless tube is better, and of course the price is higher. The seamless steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. The seamless steel pipe has a hollow section and is used in a large amount as a pipe for conveying fluid. A welded pipe is a steel pipe which is welded and deformed into a round shape by a steel strip or a steel plate and has a joint on the surface. The blank used for the welded pipe is steel plate or strip. 　　Identification method: look inside the pipe,...

　　In 1940 the United States first use UOE method to produce large diameter LSAW steel pipe . In the early 1950s, the United States built a LIOE pipe workshop with a diameter of 607 to 915 mm. 1955 ~ 1967 years of Europe, the United States, Japan UOE welded pipe construction workshop, the diameter of its pipe range of 406 ~ 1067mm, the maximum length of steel pipe is 12m. From 1967 to 1976, the maximum diameter of welded steel pipe was 1626mm, the pipe wall thickness was 40mm, the length of pipe was 18m, and continuous pre-welding and automatic nondestructive testing and automatic control were used in Germany and Japan. 　　Design scale and product program UOE pipe workshop design scale is generally 40 to 110 million t/a, the main varieties of high-quality carbon steel pipe, steel pipe yield strength of 750MPa, product specifications for the diameter of 406 ~ 1626mm, wall thickness 6. 4 ~ 40mm, length up to 18m. 　　Process UOE pipe material for the thick and thick steel plate, planing ...

　　 Classification of welded steel pipe 　　1, High frequency welded steel pipe features: tubular good, uniform thickness, internal and external burrs produced by the welding tool calibrating the appropriate online through strict control of non-destructive testing of weld quality, high degree of automation, low production costs. But relatively thin wall thickness, diameter is relatively small, usually no more than a wall thickness of 12mm, diameter generally does not exceed 610mm, particularly suitable for the production of steel tube truss structure. 　　2, LSAW pipe features: welding under static conditions, high weld quality, short welds, the probability is very small defects. By expanding full-length steel tubular good, precise size, wide range of pipe wall thickness and diameter range, the diameter range up 406-1829mm, wall thickness range up 6.0-60mm, high degree of automation, Compared to seamless steel, it is lower production costs, for buildings, bridges, dams, offshore platfor...

　　Galvanized steel pipes: In order to improve the corrosion resistance of steel pipes, general steel pipes (black pipes) are galvanized. Galvanized steel pipes are divided into hot-dip galvanizing and electric steel zinc. The hot-dip galvanizing galvanized layer is thick and the cost of electro-galvanizing is low. 　　Blowing oxygen welded pipe: used as a steel pipe for oxygen blowing, generally with small diameter welded steel pipe, the specifications are from 8/8 inch to 2 inch. Made of 08, 10, 15, 20 or Q195-Q235 steel strip. For corrosion protection, some are aluminized. 　　Wire bushing: It is also an ordinary carbon steel electric welded steel pipe used in concrete and various structural power distribution projects. The commonly used nominal diameter is from 13-76mm. The sleeve of the wire sleeve is thin, and most of it is coated or galvanized, and a cold bend test is required. 　　Metric welded pipe: The specification is in the form of seamless pipe. The welded steel pipe is exp...

　　The first one is flux-cored wires. When welding out of position on thick-walled welded steel pipe, it is better to choose gas-shielded flux-cored wire to achieve high deposition rates. This kind of filler metal can weld out of position without a special power, and the flux coating on the wire can be considered as a dam which can hold the molten weld pool in place. Therefore, the flux –cored wires are useful for improving productivity. However, there are some disadvantages when using the flux-cored wires in the welded steel pipe . Higher levels of smoke may be produced and a slag may be generated by the wires. Then both between passes and after the cap pass, the welding operators will need to chip or grind in, which in turn leads to greater downtime for cleanup. 　　The other kind is metal-cored wires. When welding welded steel pipe, the metal-cored wires are accepted more and more widely. The available diameters of the metal-cored wires range from 0.035- to 1/16-inch. In order to wel...

　　In the welding process of large welded steel pipe, we should pay great attention to the melted region of the work piece and form a molten solder, because the melted region is the connection of cooling and solidifying the material after the pool is formed. Usually, the pressure is required by large diameter thick-walled pipe in welding process. There are many welding energy sources, for example, a gas flame, electric arc, laser, electron beam, friction and ultrasonic. 　　The first one is a board probe. In the process of welding welded steel pipe, after the welded steel pipe enters the production, the manufacturers use it to manufacture large diameter submerged arc welding of steel pipes. In addition, whether there are internal defects pipe can be checked by the first full-board ultrasonic test. 　　Then, the milling, which can ensure the width of welded steel pipe reach to target diameter when the milling machine is through the two-sided edge of the milling pipe, so the width of the...

　　There are usually two heating products for the pipe billet of the welded steel pipe , including pre-heating and rolling tube. When manufacturing welded steel pipe, the two heating products should be heated before in a given path, and it requires the use of intermediate annealing so that the residual stress can be removed. Sometimes, the welded steel pipe is manufactured to meet special requirements, for example, improving the mechanical properties and improving organizational and process performance and heat treatment. Therefore, the defects of the welded steel pipe manufacturing are uneven heating, oxidation, decarburization, heating cracks, overheating and over-burning. 　　The temperature on the steel pipe usually has a great influence on the quality of it, so the manufacturers must control the temperature precisely. However, the heating temperature is too low, too high or uneven heating. The deformation resistance of the metal may be increased and the plasticity of metals may be ...

　　There are various kinds of steel pipes both in domestic and international markets for your selection, like the welded steel pipe . The steel pipe can be used as the long-distance oil and gas pipeline actually which can ensure the energy security actually. However, the surface of the stee pipe should be treated with great care to avoid the corrosion. 　　Although the surface can''t determine the corrosion totally, it has great influence except the weather condition, enviromental factors, coating type, quality and so forth. Hence, it is of great importance to learn how to coat the steel pipe in a simple but effective way. For example, you are advised to clean it very carefully. In order to remove the grease, oil, dust, lubricants, you are advised to use solvent, emulsion to clean the steel surface actually. However, such cleaning can''t help remove the surface rust, oxide, welding flux and so forth. So, you may need a steel wire brush and other tools to polish the steel...

　　General welded pipe is used for transporting low pressure liquid. Use Q195A, Q215A, Q235A steel manufacturing. Also can be used to other mild steel welding manufacturing. Welded steel pipe for pressure, bending, flattening and so on experiment, the surface quality is a certain request, usually the delivery length is from 4 to 10 m, which often required scale delivery of the goods. Of the specifications of the welded steel pipe in nominal diameter nominal diameter is different from the actual, welded pipe with wall thickness by the regulation with ordinary steel pipe and thickening structural steel pipe, steel pipe and the form of the pipe end points with thread and don't take two. 　　Galvanized steel pipe, in order to improve the corrosion resistance of steel tube, for galvanized welded steel pipe commonly. Zinc galvanization steel tube hot dip galvanized and electrical steel, hot dip galvanized zinc coating thickness, the cost of electric is low. Oxygen tube welding is used fo...

　　At present, nearly each family is equipped with different types of the pipes to deliver water, gas as well as the warm steam. They are the parts of your family, and it is necessary to repair them occasionally. Thus, how to choose the pipes you really need is important. Knowing the main differences between these two pipes will help you find out the pipes suitable for your home. The main difference between the two pipes is their basic properties. Most of the black steel pipes are iron pipes, which have high carbon as well as the ferrite. And its name black steel pipe comes from the outer black oxide cover on the surface. Ever if the black steel pipe is a type of the structural steel pipe, they are not the same completely. 　　The second difference between steel pipe and black iron pipe is their applications. For example, the welded steel pipe is often used to like your water supply system to the general water supply system, while the black steel pipe is most commonly utilized to deliv...

　　The pressure welded steel pipe consists of pipe, pipe fittings which include elbow, tee joint, taper pipe and other fittings, valve, flanged joint (flange, spacer as well as bolts), and these composition pieces are generally standard components, which can be fully decided by several factors such as their nominal pressure, texture of material, nominal diameter as well as wall thickness of the Welded steel pipe. And the nominal pressure of all the piping components in the same pipeline pressure grade. Thus, the nominal pressure grade of the piping components are called pipeline pressure grade in engineering. 　　The pipeline material grade is the piping components selecting and using regulations established by the designing institute or the engineering companies. And it is always given in the form of the excel sheet. In addition, the engineering and technical staff can make sure the detail specific provision of all kinds of dimensions and specifications of the piping components on the...

　　We’ve noted about the question why there are so many types for steel pipe fittings. Today, we would have a list for the types of steel pipe fittings standard. Under this situation, you would know how to choose the rightful one for your joint of your seamless or welded steel pipe like ERW steel pipe. 　　There are ANSI, ASME, ASTM, AN, BSP, DIN, ISO, JIS and NPT types of pipe fittings. Today, we can list for the ASME for customers and more information can be got for connection with our service. 　　ASME: American Society for Mechanical Engineers 　　This is one of the reputed organizations in the world developing codes and standards. The schedule number for pipe fitting starts from ASME/ANSI B16. The various classifications of ASME/ANSI B16 standards for different pipe fittings are as follows: 　　ASME/ANSI B16.1 - 1998 - Cast Iron Pipe Flanges and Flange Fittings 　　ASME/ANSI B16.3 - 1998 - Malleable Iron Threaded Fittings 　　ASME/ANSI B16.4 - 1998 - Cast Iron Threaded Fittings 　...

　　Frequency straight seam resistance welded steel pipe is hot-rolled coil after molding machine, the use of high-frequency current skin effect and proximity effect, so that the edge of the tube is heated to melt under pressure welding to achieve the effect of squeezing rollers produced. 　　Straight seam electric resistance welded pipe and seamless pipe has the following advantages: 　　A) high dimensional accuracy. Than the diameter welded steel pipe and seamless steel pipe wall thickness variation is much smaller, because the steel rolling and pipe forming easy to control, so the high dimensional accuracy. 　　B) good mechanical properties. Since the pipe is easy to control with the strip rolling line with the development of welding technology and heat treatment technology, the weld properties can be controlled, so straight seam electric resistance welded steel pipe elongation of 8% -10% higher than seamless steel tubes, which because straight seam welded carbon overcast about 12% l...