Large-diameter L245N straight seam steel pipe commonly used in industrial projects

L245N straight seam steel pipe is one of the large-diameter straight seam steel pipes. Here is some information about it: Material characteristics of L245N straight seam steel pipe: "L245" in L245N means that the yield strength of the steel is not less than 245MPa, and "N" represents normalizing treatment. After normalizing treatment, the organizational structure of the steel is optimized, with good strength, toughness, and welding performance, and can maintain stable performance under different working environments.

First, the manufacturing process of L245N straight seam steel pipe

- Plate coil preparation: Select steel coils that meet the requirements and conduct strict inspections on them, including chemical composition analysis, mechanical properties testing, surface quality inspection, etc., to ensure that the quality of the steel plate meets the production standards.

- Forming: Usually, the UOE forming process is adopted. The steel plate is first pressed into a U shape by a press, then pressed into an O shape, and finally expanded by a diameter expander to achieve the specified dimensional accuracy. During the forming process, it is necessary to accurately control parameters such as pressure and speed to ensure the roundness and straightness of the steel pipe.

- Welding: The edge of the formed steel pipe is welded using the straight seam submerged arc welding process. During the welding process, welding wire and flux are used to fuse the welding wire and the steel pipe base material together under the action of the high-temperature arc to form a solid weld. To ensure the quality of welding, multi-pass welding is usually used, and non-destructive testing of the weld, such as ultrasonic testing, radiographic testing, etc., is performed to promptly detect and eliminate welding defects.

- Heat treatment: Normalizing the steel pipe as needed. The steel pipe is heated to a suitable temperature range, kept warm for a certain period, and then cooled in the air to improve the organizational structure and properties of the steel and improve the strength, toughness, and fatigue resistance of the steel pipe.

- Surface treatment: To improve the corrosion resistance and service life of the steel pipe, the surface of the steel pipe will be treated, such as coating with anti-corrosion paint, galvanizing, etc.

Second, the application field of L245N straight seam steel pipe

- Oil and gas transportation: It is a common pipeline material for long-distance transportation of oil and natural gas. Its high strength and good corrosion resistance can withstand the high pressure and corrosive media erosion of oil and natural gas during transportation, ensuring the safe operation of the pipeline.

- Urban water supply and drainage projects: Large-diameter L245N straight seam steel pipes can be used in urban water supply and drainage systems. It can meet the needs of large-scale urban water supply and drainage, has the characteristics of large flow and small resistance, and has good corrosion resistance, which can reduce the maintenance and replacement costs of pipelines.

- Chemical pipeline system: In the chemical industry, it is used to transport various chemical media, such as acids, alkalis, salt solutions, and various organic compounds. After special anti-corrosion treatment, L245N straight seam steel pipes can resist the corrosion of different chemical media and ensure the smooth progress of the chemical production process.