... ,high pressure API 5L carbon seamless steel pipeA: Pipe and tube Size Range:1) Round pipe diameter: 8mm-3000mm, thickness: 0.4-60 ... .0mmB: Surface finish: black, blank, bright and galvanized, or painted C: Length of each pipe: 500mm-16,000mmD: Steel grade: 10#, 20 ... , X60, A312, 304, 316 etc API 5L carbon seamless steel pipe