seamless steel pipe
Seamless pipe is a kind of long steel with hollow section and no seam around it. There are more than 5 100 factories among more than 65,438 companies in the world, among which more than 260 factories among more than 70 companies in 44 countries produce oil pipes.
Features of seamless pipe:
First, the thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, the higher the processing cost. Secondly, the process of this product determines its limited performance. Generally, the precision of seamless steel pipe is low: uneven wall thickness, low brightness on the inner and outer surfaces of the pipe, high cut-to-length cost, and pits and black spots on the inner and outer surfaces are not easy to remove; Third, its detection and shaping must be done off-line. Therefore, it shows its advantages in high pressure, high strength and mechanical structure materials.
Seamless steel pipe manufacturing technology
1. Hot rolling (extrusion of seamless steel tube): round tube blank → heating → piercing → three-roll skew rolling, continuous rolling or extrusion → tube stripping → sizing (or reducing) → cooling → straightening → hydrostatic test (or flaw detection) → marking → warehousing.
2. Is there any cold drawing (rolling)? Sewing? Steel tube: round tube blank → heating → piercing → upsetting → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → tube blank → heat treatment → straightening → hydrostatic test (flaw detection) → marking → warehousing.
Seamless steel pipe process flow
Process flow of sanitary lens barrel:? Tube blank-inspection-peeling-inspection-heating-perforation-pickling-grinding-lubrication and air drying-welding head-cold drawing-solid solution treatment-pickling-pickling passivation-inspection-cold rolling-degreasing-cutting head-air drying-internal polishing-external polishing-inspection-marking-finished product packaging.
Industrial pipeline process flow? Tube blank-inspection-peeling-inspection-heating-perforation-pickling-mushroom trimming-lubrication and air drying-welding head-cold drawing-solid solution treatment-pickling-pickling passivation-inspection.
Seamless pipe processing flow? Unwinding-flattening-end shearing welding-looper-forming-welding-removal of internal and external weld beads-pre-correction-induction heat treatment-sizing and straightening-eddy current detection-cutting-hydraulic pressure inspection-pickling-final inspection-packaging.
? Seamless pipe specification sheet
DN20？ 26.8x2.75？ 25x2.0mm ~ 8mm？ 25x2.0 is usually selected.
DN25？ 33.5x3.25？ 32x2.5mm ~ 8mm？ 32x2.5 is usually selected.
DN32？ 42.3x3.25？ 38x2.5mm ~ 8mm？ Usually choose 38x2.5
DN40？ 48x3.5？ φ45x3mm ~ 10mm？ Usually choose 45x3.
DN50？ 60x3.5？ φ57 x3mm ~ 1 1mm？ Usually choose 57x3.
To sum up, seamless pipe has great advantages in high pressure and high strength, but at the same time, seamless pipe also has the defects of low precision and high cost. Everyone should fully understand the information of seamless pipe before buying, so as to choose the products that suit them and meet their needs. At the same time, seamless pipes have different specifications, so we should fully understand and choose the required specifications according to our own needs in order to play its greatest role and service life. The above is the information about seamless pipe and seamless pipe specifications, and I hope it will help you.
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