Changsha Xiangjia Metal Materical Co., Ltd.

High-frequency welded pipes , also known as HFW pipes, are manufactured from hot-rolled coils. The production begins with the coils being shaped by a forming machine, after which high-frequency electric currents are applied. This method utilizes the skin effect and proximity effect of the electric current to heat the edges of the pipe until they melt. When the molten edges come into contact, they are fused together under pressure via squeeze rollers, resulting in a solid, continuous pipe. The advantage of high-frequency welded pipes lies in their ability to produce pipes with a smooth, high-quality seam, resulting in excellent mechanical properties. They are often used in applications where strength and reliability are paramount, such as in oil and gas pipelines, structural supports, and various other industrial sectors. Straight Seam Welded Pipes Straight seam welded pipes  encompass a broader category of welded pipes, which includes both double-sided submerged arc weld (DSAW) pip...

Spiral steel pipes   are extremely important piping materials in modern industry. Due to their high structural strength, convenient construction, and good cost - effectiveness, they are widely used in many fields such as petroleum, natural gas, water conservancy, and construction. Spiral steel pipes of different diameters can meet different engineering requirements. The following will describe the application scenarios and technical characteristics of medium - diameter spiral steel pipes (DN200 - DN1000) in various fields. Medium - diameter spiral steel pipes (DN200 - DN1000) are the most commonly used among spiral steel pipes of different diameters. They take into account both transportation efficiency and construction flexibility and are often seen in the energy and infrastructure fields. Petroleum and natural gas transportation: Spiral steel pipes with DN400 - DN800 are key materials for long - distance pipelines. For example, in the West - to - East Gas Transmission Project, a ...

In the world of modern engineering and construction, the   LSAW (Longitudinal Submerged Arc Welded) steel pipe   stands out as a pivotal component across numerous domains. With its robust manufacturing process and durability, LSAW steel pipes are extensively utilized in domestic applications, making them essential for water transmission and structural integrity in a variety of industries. Applications in Water Engineering One of the primary uses of LSAW steel pipe is in water engineering. These pipes are commonly employed in municipal water supply systems for both potable water and wastewater management. The ability of LSAW steel pipes to withstand high pressures and resist corrosion makes them an ideal choice for conveying large volumes of liquid safely and efficiently. In these applications, they facilitate the distribution of water and the effective drainage of wastewater, thereby playing a crucial role in urban infrastructure and public health. Key Role in the Petrochemica...

In the realm of industrial manufacturing and piping solutions, choosing the right type of pipe is crucial for ensuring efficiency and durability. Two common types of welded pipes are   high-frequency welded pipes   and   ordinary welded pipes . While both serve the same primary applications, they differ significantly in their welding processes, strength, cost, and application fields. This article delves into the key differences between these two types of pipes, with a special focus on ERW steel pipes. Welding Process The most prominent difference between high-frequency welded pipes and ordinary welded pipes lies in their welding techniques.  High-Frequency Welded Pipes: The welding process for high-frequency welded pipes utilizes high-frequency induction heating. This involves the application of high-frequency electric currents that generate heat through skin and proximity effects. The edges of the pipe billets are heated and melted before being fused together under ...

Electric resistance welded (ERW) pipes   are a type of steel pipe that is manufactured through the process of welding steel coils longitudinally. ERW pipes are commonly used in a variety of applications due to their strength, durability, and cost-effectiveness. Common Applications of ERW Pipes in various industries: Construction industry: ERW pipes are commonly used for water supply and drainage systems, gas pipelines, and structural support columns. ERW pipes are popular due to their affordability and strength, making them ideal for use in construction projects. Oil and gas industry: ERW pipes are widely used in the oil and gas industry to transport oil and gas from drilling sites to refineries. They are used for both onshore and offshore applications and are popular due to their resistance to corrosion and durability. ERW pipes are also used for oil and gas pipelines, drilling casings, and refineries. Automotive industry: ERW pipes are used in the manufacturing of automobiles, bi...

With the development of building materials markets, we have various types of steel pipes in construction. In order to help you understand them, we will briefly introduce the differences between   seamless steel pipes   and   welded steel pipes   here: 1. Different processing techniques: Seamless pipes are made of carbon steel or alloy steel. The processing techniques for seamless pipes include cold drawing and hot rolling, while welded pipes are generally formed by welding. 2. Different uses: Seamless pipes are mainly used as pipelines or structural components for fluid transportation, primarily in the mechanical industry. Welded steel pipes are mainly used in the construction industry for low-pressure fluids such as water, gas, and compressed air. However, seamless steel pipes are used for pressure pipelines. 4. Different prices: Due to the complex production process of seamless steel pipes, their prices are higher compared to welded steel pipes. Welded steel pipes ...

The advantages of   welded pipe   equipment are: 1. Economic benefits. The noise of welded pipe equipment is small, and the use of circulating water cooling system is environmentally friendly and energy-saving. 2. Uses. Welded pipes are used more and more widely, which are suitable for agricultural and industrial production. 3. Quality. The finished welded pipe is good, the weld seam is complete with less burrs, the speed is fast, which is energy saving and cost saving. 4. Welded pipe equipment. Heterosexual pipes, square and rectangular pipes can be produced on welded pipe equipment. Because the welded pipe equipment can withstand greater bending force, which can save a lot of metal and save processing hours. 5. Environmentally friendly. The production of high-frequency welded pipe equipment has the characteristics of no pollution and low noise, and does not produce waste water or waste gas. Circulating water cooling is used in production, which is energy-saving and environme...

 1. Seamless Steel Pipe  The typical method for making  seamless tubes  is the Mannesmann method, in which a rod-like billet is heated to a high temperature, and then compressed from the periphery and perforated at the center using a tool called a "perforating mandrel". This manufacturing method is suitable for mass production. It can make large diameter steel pipe and is also suitable for thick wall steel pipe. Because there are no joints, the original properties of the material can be maintained. However, in terms of manufacturing methods, the dimensional accuracy is not very good. 2. Welded Steel Pipe  The material of  welded pipe  does not use bar billets but uses steel strips (coils). For example, for seam pipe welded with resistance welding, the process is to use the uncoiler to continuously pull out the steel strip and make it cylindric. The joint part of the cylinder is changed into a high-temperature state with a large current, and the joint i...

Crushing is one of the surface defects of   welded pipes . It is damage caused by the roller hole to the surface of the tube blank. There are many types of crushing, but there are various reasons for it. Next, we will talk about what may casuse crush to welded pipe. (1) Adjust the bottom line of a pair of rollers to be higher than the rolling bottom line makes the rolling line will produce uneven fluctuations; (2) The vertical roller is too tight; (3) Elevation of vertical roller; (4) The new hole may be that the chamfer of the hole edge is too small or the chamfer does not meet the requirements; (5) The high-strength tube blank has greater resilience and deformation resistance, and the edge of the hole is easy to bite into the tube blank; (6) The vertical roll before the flat roll is not enough to exert force on the tube blank, so that the wider tube blank enters the fixed width of the flat roll hole, and the tube blank is "cut" by the hole pattern; (7) The flat roll is low,...

The strength of the   spiral welded pipe   is higher than   straight seam welded pipe . It can produced by larger diameters from narrower billets and the same width billets can produce different diameters spiral welded pipes. Most of the maller diameters welded pipe use straight seam welded pipe and most of the large diameters welded pipes use spiral welded pipe. Spiral welded steel pipe can be divided into automatic submerged arc welded steel pipe and high frequency welded steel pipe. a. Spiral seam automatic submerged arc welded steel pipes are divided into A-type pipes and B-type pipes according to the pressure of the conveying medium. Type A pipes are welded with ordinary carbon steel Q235, Q235F and ordinary low-alloy structural steel 16Mn, and Type B pipes are welded with Q235, Q235F, Q195, etc., and are used as low-pressure fluid conveying pipes. b. Spiral seam high frequency welded steel pipe has no unified producting standard, it is made of ordinary carbon steel ...

  1.       The cleaning of  LSAW steel pipe  uses solvents and emulsions to clean the steel surface to remove oil, grease, dust, lubricants and similar organic substances, but it cannot remove rust, oxide skin, welding flux, etc. It is only used as an auxiliary means in production.   2.       The rust removal of LSAW steel pipe tools mainly uses tools such as wire brushes to polish the surface of the steel, which can remove loose or raised oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level.   3.       Pickling of LSAW steel pipe: Generally, two methods of chemical and electrolytic pickling are used for pickling, and only chemical pickling is used for anti-corrosion of pipes, which can remove oxide scale, rust and old coating. reprocessing. Although chemical cleaning can make the surface achieve ...

  1.       The raw materials of  LSAW steel pipe  are strip coil, welding wire and flux.   2.       The technology used in the production of LSAW steel pipe is divided into single wire or double wire submerged arc welding. 3.       Before the LSAW steel pipe is formed, the strip needs to be straightened, trimmed, planed, surface cleaned, conveyed and pre-bent.   4.       When using the weld gap control device, it must be ensured that the weld gap meets the welding requirements, and the pipe diameter, misalignment and weld gap must be handled in strict accordance with the regulations.   5.       All welds are inspected by online continuous ultrasonic automatic flaw detector to ensure 100% non-destructive testing of spiral welds and prevent defective products.   6.       After the LSAW steel pipe is complet...

The   spiral pipe   size inspection are: the wall thickness, outer diameter, length, curvature, ovality, end face groove and obtuse angle of the spiral pipe, and the cross-sectional shape of the special-shaped steel pipe. 1. The commonly used inspection tool for steel pipe wall thickness is the wall thickness micrometer. During inspection, use a qualified micrometer to measure the wall thickness of the steel pipe one by one. The end side measurement of the spiral pipe should be no less than 8 points. The modern seamless steel pipe production unit uses ultrasonic equipment to detect and record the full length of the steel pipe wall thickness. 2. The tools used for the inspection of the outer diameter and ovality of the steel pipe are calipers and vernier calipers. When measuring, the caliper or vernier caliper should be perpendicular to the axis of the steel pipe, and the steel pipe should be slowly rotated to measure the maximum and minimum points of the section where the stee...

Generally,  Q345 welded pipe  has no magnetism or weak magnetism, so that for manufacturers, it is necessary to eliminate the magnetism of Q345 welded pipe. How to solve the magnetic problem of Q345 welded pipe? In order to completely eliminate the magnetism of the Q345 welded pipe, the austenite can be stabilized by high temperature solid solution to eliminated magnetism. Changsha Xiangjia Metal Materical Co., Ltd.  is professional manufacture in SSAW steel pipe, galvanized steel pipe, seamless pipe etc. with various grades and sizes. Years of production experience and manufacturing facilities who have a capacity of 200,000 tons per annual will ensure the good quality and competitive duration of our products.

The strength of   SSAW pipe   is higher than LSAW pipe, which can produce welded pipes with larger diameters from narrower billets, also it can use billets of the same width to produce welded pipes with different diameters. However, compared with the same length of LSAW pipe, the seam length of the SSAW pipe is increased by 30~100%, so the produce speed is low. Therefore, most of the welded pipes with smaller diameters use straight seam welding, and most of the welded pipes with large diameters use spiral welding. SSAW pipe is divided into two types: automatic submerged arc welded steel pipe and high frequency welded steel pipe. 1. Spiral seam automatic submerged arc welded steel pipes are divided into two categories: A-type pipes and B-type pipes according to the pressure of the conveying medium. Type A pipes are welded with ordinary carbon steel Q235, Q235F and ordinary low-alloy structural steel 16Mn. Type B pipes are welded with steel Q235, Q235F, Q195, etc., and are used ...

Helical welded pipe   is a pipe in which the welds are spirally distributed on the pipe. It used for conveying pipelines, pipe piles and structural pipes. Product specification: outer diameter 300～3660mm, wall thickness 3.2～25.4mm. The characteristics of spiral welded pipe: (1) Pipes with various outer diameters can be produced from the same width strips; (2) The straightness of the pipe is good, the size is accurate, and the inner and outer spiral welds increase the rigidity of the pipe body, so there is no need for sizing and straightening processes after welding; (3) It is easy to realize mechanization, automation and continuous production; (4) Compared with other equipment of similar scale, its size, the land occupation and investment are small;  (5) Compared with the straight seam welded pipe of the same size, the welding seam per unit length of the pipe is longer. Changsha Xiangjia Metal Materical Co., Ltd.  the Steel Pipe Division of ADTO GROUP, is one of the leadi...

The bearing pressure of the pipeline is increasing and it is nessary to extended the service life of the pipeline, so the development direction of the   spiral welded pipe   is: 1. Produce large-diameter thick-walled pipes to improve pressure resistance; 2. Design and produce steel pipes with new structures, such as double-layer spiral welded pipes, which double-layer pipes are welded with strip steel whose thickness is half of the pipe wall and the strength is higher than that of single-layer pipes of the same thickness; 3. Develop new steel grades, improve the technical level of smelting process and the strength, toughness and welding performance of the pipe; 4. Develop coated pipes and coat the inner wall of the pipe with an anti-corrosion layer, which can not only prolong the service life, but also improve the smoothness of the inner wall, reduce fluid friction resistance. There are the development of spiral welded steel pipe, welcome to click here to know more  the p...

The difference between   straight seam pipe   and   spiral pipe : 1.From the perspective of processing: straight seam pipe are formed by bending steel plates of a certain width into cylinders and then welding them to form. The equipment is simple and the productivity is high. Spiral pipes are made by winding steel plates of a certain width into a tube, and then welding them. The equipment is complicated. At the same time, because the welds are much longer than the straight seam steel pipes, the productivity is relatively low. 2. From the perspective of strength: the internal stress of straight seam steel pipe is distributed along the weld seam after welded, while the internal stress of the spiral steel pipe after welded is evenly distributed in the axial and radial directions, which can partially offset the pressure. So in terms of pressure resistance, spiral steel pipe is stronger. Here is the difference between straight seam pipe and spiral pipe from the perspective of ...

Welded pipe can be divided into three types according to production process: spirally submerged arc welding (SSAW), longitudinally submerged arc welding(LSAW) and electric resistance welding(ERW). We will focus on the production process of   SSAW steel pipe   here. 1. Raw materials of spiral steel pipe are strip coils, welding wire, and flux. 2. The strip undergoes leveling, edge trimming, edge planing, surface cleaning and conveying, and pre-bending treatment before forming. 3. The welding seam gap control device is used to ensure that the welding seam gap meets the welding requirements, and the pipe diameter, the amount of misalignment and the welding seam gap are strictly controlled. 4. After cutting into single steel pipes, the first three of each batch of steel pipes shall undergo a strict initial inspection system to check the mechanical properties, chemical composition, fusion status of the welds, the surface quality of the steel pipes and pass non-destructive inspectio...

The characteristics of   LSAW steel pipes : 1. After the mechanical expansion treatment, the internal stress of the steel pipe is small and evenly distributed, which can effectively prevent stress corrosion cracking and convenient for on-site welding construction.   2. It adopts the pre-welding and finishing welding process, the welding process is stable and the welding seam quality is high.   3. Weld seam are easy to realize non-destructive flaw detection in the production process and non-destructive flaw detection in the field during use.   4. Compared with non-straight welded pipes, the weld seam is shorter and welding defects is small.   5. The range of product specifications is large, which can produce steel pipes with small diameter and large wall thickness as well as large diameter and large wall thickness. Changsha Xiangjia Metal Materical Co., Ltd.  the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in Chin...