OCTG is the abbreviation of Oil Country Tubular Goods, which mainly refers to the pipe products used in oil and gas production (drilling operations). Oil Country Tubular Goods are usually manufactured according to API specifications or related standard specifications. Thick-walled oil country tubular goods manufacturers must not only meet the specifications of each customer, but also meet the requirements of API 5L & 5CT, ISO, EN and other standards. It can also be considered as a general term for drill pipes, steel casings, fittings, joints and accessories used in the onshore and offshore oil and gas industry. These products can be either welded or seamless. In order to control the chemical properties and apply different heat treatments, oil country tubular goods are divided into more than ten grades of different performance materials. OCTG also usually includes a series of accessories (commonly called pipes) and various accessories involved in its manufacturing and processing. These accessories include drill pipes, casings or tubing, thread protectors, insertion guides, buffer rings and pipe plugs.