GB13296-2013 (Seamless steel pipes for boilers and heat exchangers). Mainly used in boilers, superheaters, heat exchangers, condensers, catalytic tubes, etc. of chemical enterprises. Used high-temperature, high-pressure, corrosion-resistant steel pipe. Its representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc. GB/T14975-1994 (Stainless steel seamless steel pipe for structure). It is mainly used for general structure (hotel and restaurant decoration) and mechanical structure of chemical enterprises, which are resistant to atmospheric and acid corrosion and have certain strength steel pipes. Its representative materials are 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.

GB/T14976-2012 (Stainless steel seamless steel pipe for fluid transportation). Mainly used for pipelines that transport corrosive media. Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti, etc.

YB/T5035-2010 (Seamless steel pipes for automobile axle sleeves). It is mainly used to make high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipes for automobile half-axle sleeves and axle tubes of drive axle housings. Its representative materials are 45, 45Mn2, 40Cr, 20CrNi3A, etc.

API SPEC 5L-2018 (line pipe specification), compiled and issued by the American Petroleum Institute, is commonly used all over the world.

Line pipe: includes seamless and welded pipes. The pipe ends have flat ends, threaded ends and socket ends; the connection methods are end welding, coupling connection, socket connection, etc. The main materials are GR.B, X42, X52. X56, X65, X70 and other steel grades.

 API SPEC5CT-2012 (Casing and Tubing Specification) is compiled and issued by the American Petroleum Institute (American Petreleum Instiute, referred to as “API”) and used in all parts of the world. 

in:

Casing: A pipe that extends from the ground surface into the well and serves as a well wall lining. The pipes are connected by couplings. The main materials are steel grades such as J55, N80, and P110, and steel grades such as C90 and T95 that are resistant to hydrogen sulfide corrosion. Its low steel grade (J55, N80) can be welded steel pipe.

Tubing: A pipe inserted into the casing from the ground surface to the oil layer, and the pipes are connected by couplings or integrally. Its function is to allow the pumping unit to transport the oil from the oil layer to the ground through the tubing. The main materials are steel grades such as J55, N80, P110, and C90, T95 that are resistant to hydrogen sulfide corrosion. Its low steel grade (J55, N80) can be welded steel pipe.