Q235B spiral steel pipe Q345B spiral steel pipe 3pe anti-corrosion spiral steel pipe quotation today

Description :

　　API5L spiral steel 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.

　　API 5L PSL2 spiral steel pipe has the characteristics of biaxial symmetry, overlapping cross-sectional centroid and shear center. Moreover, circular and square tube sections have the same moment of inertia for each axis, highlighting their advantages as bending and compression members. The API 5L PSL2 spiral steel pipe section is closed, with high torsional stiffness and good local stability of the plate, especially for circular pipe sections. The polar axis distribution of the section is uniform, and the resistance to torque is particularly effective.

　　Compared with ordinary open section steel, API 5L PSL2 spiral steel pipes have the characteristics of smooth surface, no dead corners, and small outer surface area for round and square (rectangular) sections, which is conducive to saving anti-corrosion and fireproof coatings and facilitating dust removal. The wind resistance coefficient is small, which has significant advantages when applied to fluids such as wind and water flow.

　　Spiral steel pipes feed the strip steel into the welded pipe unit, where it is rolled by multiple rollers and gradually rolled up to form a circular billet with open gaps. The pressing amount of the extrusion roller is adjusted to control the weld seam gap at 13mm and ensure that both ends of the weld are flush.

　　If the gap is too large, it will cause a reduction in proximity effect, insufficient eddy current heat, poor intergranular bonding in the weld seam, and result in incomplete fusion or cracking.

　　If the gap is too small, it will cause an increase in proximity effect, excessive welding heat, and result in weld burnout; Or the weld seam may form deep pits after being squeezed or rolled, affecting the surface quality of the weld seam.

　　After heating the two edges of the billet to the welding temperature, a common metal grain penetrates and crystallizes with each other under the extrusion of the extrusion roller, ultimately forming a solid weld seam. If the extrusion force of the spiral steel pipe is too small, the number of common crystals formed will be small, the strength of the weld metal will decrease, and cracking will occur after being subjected to force; If the extrusion force is too high, the molten metal will be squeezed out of the weld seam, which not only reduces the strength of the weld seam, but also produces a large number of internal and external burrs, and even causes defects such as welding overlap.

　　GB9711 Spiral steel pipe length measurement method:

　　1. Use a grating ruler to measure the length of spiral steel pipes according to GB/T9711.2. Two fixed length grating rulers are set on the outer sides of both ends of the steel pipe, and a rodless cylinder is used to drive the grating rulers close to the ends of the steel pipe. The interference phenomenon of light is used to measure the length of the steel pipe, and the measurement dimensions can be obtained.

　　2. Use a camera to measure the length of spiral steel pipes according to GB/T9711.2, and use image processing to measure the length of the steel pipes. Install a series of equidistant photoelectric switches on one section of the steel pipe conveyor roller, and add a light source and camera on the other section. When the steel pipe passes through this area, the length of the steel pipe can be determined based on the position of an image captured by a camera through a photoelectric switch on the screen.

　　3. The encoder is used to measure the length of the spiral steel pipe in GB/T9711.2. An encoder is installed at the oil cylinder to push the steel pipe to move on the roller conveyor. A series of equidistant photoelectric switches are installed on the other side. When the steel pipe is pushed by the oil cylinder and the pipe end touches the photoelectric switch, the recorded encoder reading is used to convert the stroke of the oil cylinder, which can calculate the length of the steel pipe.

　　GB9711 Spiral Steel Pipe Main Process Characteristics:

　　a. During the forming process, the steel plate deforms uniformly, with minimal residual stress and no scratches on the surface. The processed spiral steel pipes have greater flexibility in the size specifications of diameter and wall thickness, especially in the production of high-grade thick walled pipes, especially small and medium-sized thick walled pipes, which have unparalleled advantages compared to other processes and can meet more requirements of users in terms of spiral steel pipe specifications.

　　b. By adopting advanced double-sided submerged arc welding technology, it is possible to Position based welding is less prone to defects such as misalignment, welding deviation, and incomplete penetration, making it easier to control welding quality.

　　c. Conducting a 100% quality inspection on steel pipes ensures that the entire production process is under effective testing and monitoring, effectively guaranteeing product quality.

　　d. All equipment on the entire production line has the function of networking with the computer data acquisition system to achieve real-time data transmission, and the technical parameters during the production process are controlled by the central control room.

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