Line pipe is divided into a variety of different kinds by the production process, but the main use of oil and gas pipelines are seamless steel pipe(SMLS steel pipe), high-frequency straight seam resistance welding pipe (HFW steel pipe), Longitudinally Submerged Arc welding steel pipe(LSAW steel pipe), and spiral submerged arc welded pipe (SSAW steel pipe).
And it mainly has four kinds of standards as below:
GB/T9711.1-1997 "The oil and natural gas industries - Steel pipe technical delivery conditions for the first Part: A grade steel", GB/T9711.2-1999 "The oil and natural gas industries - Steel pipe Technical delivery conditions for the second part: B Grade Steel", GB/T9711.3-2004 "The oil and gas industries - Steel pipe technical delivery conditions for the third part: C grade steel" (ISO3183-1996 / 1999), API SPEC 5L "specification for line Pipe".
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