Vigor Drilling API 5CT Tubing/OCTG Tubing(Tubing oil and gas) is one of the important component parts in the production system of a flowing well and is the main channel for oil and gas field development. For the manufacture of tubing/OCTG tubing pipe, except the "upsetting" process to thicken the wall of pipes, the manufacturing of OCTG Tubing/tubing pipes and casing pipes are identical. First, green steel tubes are threaded on each end. The threading is then inspected and, if necessary, rethreaded to ensure that the tubing thread accurately connects to the tubing coupling. The OCTG tubing and casing pipes are strengthened by surface treatment and are subject to various inspections, including drifting and hydrostatic tests before they are coated and packaged into OCTG tubing and casing pipes.Any oil well system has an optimum Tubing oil and gas/OCTG tubing/Tubing size. Undersized OCTG tubing will limit the production rate due to the increased friction resistance caused by excessive flow velocity. Contrarily, oversized tubing may lead to an excessive liquid phase loss due to slippage effect or an excessive downhole liquid loading during lifting. As a specialized API 5CT Casing and Tubing manufacturers and supplier, also provides API 5L seamless steel pipe, API 5CT oil Casing pipe, Tubing Coupling, and more.China Vigor supply the high quality OCTG tubing/Tubing oil and gas, and we will be your best choose in Casing and tubing manufacturers.OCTG Tubing/Tubing instock size: 1.9"~ 4 1/2"Tubing material grade: H40, J55, K55, N80,N80Q, L80, C90, C95, T95, P110, Q125,SS95,SS110, 9%CR, 13%CRSpecial for L80 13Cr Tubing/OCTG Tubing is a grade 80ksi martensitic stainless steel described in API 5CT and ISO 11960 (tubulars in carbon and low alloy steels). The alloy is widely used in tubular form for casing and tubing/tubing oil and gas in standard and CO2 environment. pH, chlorides, temperature and H2S can limit its use in other environments. ISO 15156-3 limits the hardness to 22 HRC max for sour service. The alloy is almost similar to AISI 420 modified.OCTG TubingThreads:NUE (Non-upset End), also can be called 10Rd;EUE (External-upset-end), can be called 8Rd;IJ (Integral-joint) typeIf you are looking for competitive, high quality and fast delivery oilfield tubing in stock, or if you are planning to buy tubing API from one of the leading saw octg, super 13cr tubing, vam top tubing stock, tenaris tubing in stock, sumitomo tubing stock manufacturers and suppliers China, please feel free to contact VIGOR.