What is the classification of steel pipe

Casing: Pipe inserted from the surface into the well to serve as a lining and connected by a collar. The main material is J55, N80, P110 and other steel grade, as well as hydrogen sulfide corrosion resistant C90, T95 and other steel grade. Its low steel grade (J55, N80) can be welded steel pipe.

Tubing: A pipe that is inserted into a casing from the surface to the reservoir and is connected by a collar or integral connection. Its function is to pump oil from the reservoir to the surface through the pipeline. The main materials are J55, N80, P110, and hydrogen sulfide resistant C90, T95 and other steel grade. Its low steel grade (J55, N80) can be welded steel pipe. API SPEC 5L, developed and published by the American Petroleum Institute, is used worldwide.

Pipeline: is the shaft out of the surface of the oil, gas or water, through the pipeline pipe to the oil and gas industry enterprises. Pipeline pipe includes seamless and welded pipe two, the pipe end has a flat end, a threaded end and a socket end; The connection modes are end welding, collar connection, socket connection, etc. The main material of the pipe is B, X42, X56, X65, X70 steel grade.

The billet used for welding steel pipe is steel plate or strip steel, because the welded pipe is divided into furnace welded pipe, electric welding (resistance welding) pipe and automatic arc welding pipe due to its different material and technology. Because of the different welding forms, it can be divided into straight seam welded pipe and spiral welded pipe. Because of the shape of its end is divided into circular welded pipe and special shape (square, flat, etc.) welded pipe use is different and divided into several varieties as follows