Quality Standard: 
API 5L Standard Specification for Seamless Line Pipe or Seamless Pipe Line
ASTM A 53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM A519 Seamless Carbon and Alloy Steel Mechanical Tubing 
ASTM A106 Seamless Carbon Steel Pipes for oil pipeline and gas pipeline transportation 
GB/T8162 Seamless Steel Tubes for Structural Purposes
JIS G3441 Alloy steel tubes for machine purposes 
JIS G3444 Carbon steel pipes for general structural purposes 
JIS G3445 Carbon steel tubes for machine structural purposes 
DIN 2391 Seamless Precision Steel Tubes 
EN10305 Steel tubes for precision applications. Technical delivery conditions. Seamless cold drawn tubes
EN 10297 Hot rolled seamless steel tubes with an application in the mechanical and general engineering
EN 10210:Seamless structural steel pipes