API 5L seamless steel pipe refers to seamless line pipe. The main materials of seamless steel pipe pipeline steel are: GR.B, X42, X46, 52, X56, X60, X65, X70. The line pipe is to transport the oil, steam, and water pumped out of the ground to the oil and gas industry enterprises through the line pipe. Line pipes include seamless pipes and welded steel pipes, and the pipe ends have flat ends, threaded ends and socket ends; the connection methods are welding, collar connection, socket connection, etc.
With the development of API 5L pipeline steel seamless steel pipe technology and the advancement of molding and technology, the application range of API 5L pipeline steel seamless pipe is gradually expanding, especially the advantages of API 5L large-diameter pipeline steel seamless steel pipe are more obvious. Due to the cost factor, API 5L pipeline steel seamless steel pipe has occupied a dominant position in the field of pipeline steel pipe.
Points to note when purchasing API 5L seamless line pipes:
1. Go to a large conventional steel pipe company to buy. Regular large companies generally purchase or act as agents from relatively well-known large seamless steel pipe companies in China, and the quality is guaranteed;
2. It is necessary to check the product quality certificate issued by the seamless steel pipe manufacturer and the certificate number of the production license management;
3. Choose the appropriate specifications, because seamless steel pipes of different specifications are used in different fields, and their functions are also different;
4. Choose seamless steel pipes with different processes, because seamless steel pipes can be divided into cold-rolled and hot-rolled, and the production process is different, the characteristics of steel pipes are also different, and the applicable fields are naturally different;
5. For seamless steel pipes of the same specification, you can consult different manufacturers and compare them repeatedly. If they are far below the average value, you cannot buy them;
6. Pay attention to observation, the surface of the seamless steel pipe is not allowed to have defects such as cracks, scars and folds;
7. The manufacturer's bulk purchase method is the first choice. If you want to wholesale seamless steel pipes, it is best to find the other party's manufacturer directly. After all, you can still enjoy certain discounts without intermediate links, and you can save more costs.
Manufacturing process of API 5L seamless line pipe:
Hot-rolled (extruded) seamless steel pipe: round tube billet → heating → piercing → three-roll cross rolling, continuous rolling or extrusion → tube removal → sizing (or reducing) → cooling → billet tube → straightening → hydraulic pressure Test (or flaw detection) → mark → storage.
Cold drawn (rolled) seamless steel pipe: round tube billet→heating→perforation→heading→annealing→pickling→oiling (copper plating)→multi-pass cold drawing (cold rolling)→blank tube→heat treatment→straightening→ Hydrostatic test (flaw detection) → marking → storage.
