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Pipe knowledge: 51 steel pipe network to provide seamless steel pipe manufacturing process
A comprehensive process for manufacturing large-diameter alloy seamless steel pipes is described. This method involves several key steps, starting with material preparation, followed by heating the tube billet and performing oblique rolling to create a hollow tube. The next stage includes trimming the capillary tube to ensure uniform dimensions. After that, the pipe undergoes thermal expansion deformation to achieve the desired size. Heat treatment is then applied to improve the mechanical properties of the steel. Subsequent steps include straightening, inner grinding, correction, external grinding, and multiple inspection stages to ensure quality compliance. Finally, the product is finished, inspected again, and packaged for delivery.
This invention enables the production of high-grade alloy seamless steel pipes in large quantities, while maintaining a relatively low investment cost, superior product quality, efficient production speed, and reduced manufacturing expenses. The main production process involves heating the tube billet, perforating the blank, extending the tube, rolling, sizing, cooling, and finishing. Additional steps such as zinc acid washing, cold drawing, carbon burning, cutting the head, and packaging are also included to enhance the final product's performance and appearance.
The method for producing seamless steel pipes features a production line equipped with multiple rolling stands, each containing a set of rolls and mandrel-type mills arranged in different rolling directions. After the pipe is rolled, the wall thickness in the circumferential direction is measured at various points. Based on these measurements, the final rolling stands of the mandrel mill are adjusted accordingly. Additionally, the axial positions of the rolls are carefully controlled to minimize wall thickness variations, ensuring consistent quality throughout the entire length of the pipe.
This detailed and systematic approach ensures precision, efficiency, and reliability in the manufacturing of high-quality seamless steel pipes, making it a valuable innovation in the steel industry.