Urban sewage spiral steel pipe epoxy coal tar anti-corrosion spiral steel pipe anti-corrosion spiral steel pipe quotation

Description :

　　According to Hebei News Information, the price of spiral steel pipes for sewage engineering has recently been reported. Our focus is on customers and we strive to exceed their expectations for our services. Not only to gain customer recognition, but also to pursue customer success. The success of our customers means that our successful service starts from the heart Cangzhou Guanghui Pipeline Co., Ltd. is a manufacturer of Q235B spiral steel pipes in Hebei Province. The spiral steel pipes comply with the departmental standard SY/T5037 bar 2000 and the national standard GB/T9711 bar 1997. Our factory produces a complete range of spiral steel pipes, including those for natural gas, sewage, tap water, drainage, pile driving, Q235A, Q235B, Q345B, L245, L290, and L360.

　　The price of spiral pipes used in sewage engineering. Cangzhou Longdu Pipeline Co., Ltd. produces large-diameter spiral steel pipes and spiral welded pipes. The development history of steel pipe production methods, spiral steel pipe materials, spiral steel pipe applications, and the emergence of spiral welded pipes have brought earth shaking changes to the entire industry. China has a long history of manufacturing spiral welded pipes. Spiral welded pipes appeared in 1888, and after double-sided welding appeared in 1960, the quality of their welds was greatly improved. The spiral welding steel pipe unit is mainly used for producing steel pipes with an outer diameter of 219 to 1220mm, a wall thickness of 5 to 16mm, and a length of 6-35m for conveying pipelines, pipe piles, and certain mechanical structures. The outer diameter of spiral welded steel pipes produced domestically can now reach 3620mm. Most of the spiral steel pipes manufactured in China have a diameter of 1.8 meters or less, with the vast majority having a diameter of 1220 or less. Some domestic manufacturers can reach a diameter of 2500mm, and a very small number can reach 3200mm. In the past, it was difficult to find the exact diameter in search engines. The spiral welded pipe produced by Longdu in Cangzhou has a diameter of 3620mm, setting a record for large-diameter spiral welded pipes with a diameter of 3620mm in China. Nowadays, the caliber advertised everywhere in search engines is 3620mm.

　　Production method: Large caliber spiral welded pipe (double-sided submerged arc spiral welded pipe) is a spiral seam steel pipe 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 (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. Each batch of three steel pipe heads must undergo a strict initial inspection system to check the mechanical properties, chemical composition, fusion condition, surface quality of the steel pipe, and undergo non-destructive testing to ensure that the pipe manufacturing process is qualified before it can be officially put into production. (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. (9) Use an air plasma cutting machine to cut steel pipes into individual pieces. 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. (10) After cutting into single steel pipes, each batch of three steel pipe heads must undergo a strict initial inspection system to check the chemical composition, fusion condition, surface quality of the welded joints, and undergo non-destructive testing to ensure that the pipe manufacturing process is qualified. (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.

　　Spiral pipes for sewage engineering are used for various purposes, including water supply engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, and urban construction; Used for liquid transportation: water supply and drainage; Used for gas transportation: coal gas, steam, liquefied petroleum gas; For structural purposes: used as pile driving pipes (spiral steel pipes for piles), bridges, and steel structures; Pipes for docks, roads, and building structures; Spiral tubes are formed by bending hot-rolled strip steel in a spiral shape, and welding the inner and outer seams using submerged arc automatic welding to produce spiral tubes. Due to the following reasons, it can be widely used in the production of large-diameter spiral pipes: 1) By changing the forming angle, various diameters of spiral pipes can be produced using the same width of strip steel; 2) Because it is formed by continuous bending, the fixed length of the spiral tube is not limited; 3) The spiral shape of the weld seam is evenly distributed throughout the circumference of the spiral tube, so the dimensional accuracy and strength of the spiral tube are high; 4) Easy to change size, suitable for the production of small batches and multiple varieties of spiral tubes.

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