Anti corrosion spiral steel pipe 5037 spiral steel pipe in stock supply

Description :

　　Large caliber L290 spiral steel pipe is a general term, generally referring to spiral steel pipes with a diameter greater than 1 meter. Spiral steel pipes are made by bending steel strips and then welding them together. Steel pipes need to undergo tests such as water pressure, bending, and flattening, and there are certain requirements for surface quality. The usual delivery length is 12 meters, and it is often required to be delivered to a fixed length. The specifications of spiral steel pipes are expressed in nominal diameter (millimeters), which may differ from the actual diameter. According to regulations, there are two types of wall thickness: ordinary steel pipes and thickened steel pipes.

　　Large caliber L290 spiral steel pipes are mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, and are one of the twenty key products developed in China. Used for liquid transportation: water supply and drainage. Used for gas transportation: coal gas, steam, liquefied petroleum gas. Used for structural purposes: as pile driving pipes, as bridges; Pipes for docks, roads, building structures, etc.

　　Large caliber L290 spiral steel pipe is made of strip steel coil as raw material, often formed by warm extrusion, and welded by automatic double wire double-sided submerged arc welding process. The main production process is as follows:

　　(1) The raw materials are strip steel coils, welding wire, and flux. Strict physical and chemical tests must be conducted before investment.

　　(2) The head and tail of the strip steel are connected by single or double wire submerged arc welding, and automatic submerged arc welding is used for repair welding after being rolled into a steel pipe.

　　(3) Before forming, the strip steel undergoes leveling, trimming, planing, surface cleaning, conveying, and pre bending treatment.

　　(4) The use of an electric contact pressure gauge to control the pressure of the oil cylinders on both sides of the conveyor ensures the smooth transportation of the strip steel.

　　(5) Adopting external or internal control roller molding.

　　(6) Adopting a weld seam gap control device to ensure that the weld seam gap meets the welding requirements, the pipe diameter, misalignment, and weld seam gap are strictly controlled.

　　(7) Both internal and external welding are carried out using American Lincoln welding machines for single or double wire submerged arc welding, in order to obtain stable welding specifications.

　　(8) The welded seams are all inspected by an online continuous ultrasonic automatic damage tester, ensuring the coverage of non-destructive testing for spiral welds. If there is a defect, it will automatically sound an alarm and spray a mark, and production workers will adjust the process parameters accordingly to eliminate the defect in a timely manner.

　　(9) Use an air plasma cutting machine to cut steel pipes into individual pieces.

　　(10) After cutting into single steel pipes, each batch of three steel pipe heads must undergo a strict initial inspection system to check the mechanical properties, chemical composition, fusion status, surface quality of the welded joints, and undergo non-destructive testing to ensure that the pipe manufacturing process is qualified before it can be officially put into production.

　　(11) The parts with continuous ultrasonic testing marks on the weld seam shall be manually inspected by ultrasonic and X-ray. If there are indeed defects, they shall be repaired and undergo non-destructive testing again until it is confirmed that the defects have been eliminated.

　　(12) The pipes where the welded joints of the strip steel and the T-shaped joints intersecting with the spiral welds are located are all inspected by X-ray television or film.

　　(13) Each steel pipe undergoes a hydrostatic pressure test, and the pressure is sealed radially. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. Automatic printing and recording of experimental parameters.

　　(14) Mechanical processing of pipe ends to accurately control the perpendicularity, slope angle, and blunt edge of the end face.

　　Although affected by the economic crisis, Spiral Steel Pipe Company is gradually recovering and welcoming a better tomorrow. Spiral steel pipes have played a significant role in transporting gas and transportation.

　　With the planning and construction of multiple major pipeline projects, high value-added products such as large deformation pipeline steel, high-strength hot bending pipes, and thick specification low-temperature pipe fittings have shown good market competitiveness and significant market demand. However, domestic enterprises have made relatively slow progress in developing this series of products. In order to develop high value-added and large deformation pipeline steel, hot bending pipe steel, low-temperature pipe fittings steel for pipeline stations, X100 straight seam submerged arc welded pipe, spiral seam submerged arc welded pipe, hot bending pipe, and spiral steel pipe suitable for industrial applications as soon as possible.

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• Anti corrosion spiral steel pipe