ASTM A519 Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing
API 5L Stanard Petroleum and Natural Gas Industries—Steel Pipe for Pipeline Transportation Systems
DIN 30670 Polyethylene Coating for Steel Pipes and Fittings
DIN EN 10219-1 Cold Formed Welded Structural Hollow Sections of Non-alloy and Fine Grain Steel