When it comes to the API, its name is definitely famous worldwide. The API refers to the American Petroleum Institute. Founded in 1919, it is the first national business association in the United States and one of the earliest and most successful standards-setting chambers in the world. As an international standard, it has long been engraved in the hearts of every steel practitioner.
There are a wide variety of API standards, including pipes, fittings, and steel components. The API SPEC steel pipe is roughly two parts: oil casing and line pipe. API 5L generally refers to the implementation standard for pipeline steel pipes, which are pipes used to transport oil, steam, water, etc. from the ground to oil and gas industrial enterprises. It includes two types of seamless steel pipes
and welded steel pipes. The welded steel pipe pipes, which was commonly used in oil pipelines in China, are spiral submerged arc welded pipes (SSAW
), straight seam submerged arc welded pipes (LSAW
) and electric resistance welded pipes (ERW
). Steel pipes are generally used when the pipe diameter is less than 152 mm.
The API seamless steel pipe is a long strip of steel with a hollow section and no seams around it. A large number of pipes used to transport fluids, such as steel, natural gas, gas, water steel pipe to make ring parts, which can effectively improve material utilization, simplify manufacturing processes, save materials and processing man-hours, such as rolling bearing rings, jack sets, etc. It is widely manufactured with steel pipes.
Api seamless steel pipe manufacturing process:
hot rolling (extrusion seamless steel pipe): round billet → heating → perforation → three-roll cross-rolling, continuous rolling or extrusion → pipe removal → sizing (or reducing diameter) → cooling → billet Tube → straightening → hydrostatic test (or flaw detection) → marking → storage.
Cold drawn (rolled) seamless steel pipe: round tube billet → heating → perforation → head → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → Hydraulic test (inspection) → mark → storage.