Seamless steel pipes in liquid transportation are mainly applied to petroleum and gas long-distance transportation. Detailed Product Description Name: The Seamless pipes are mainly made by ASTM A312/ 213/269 standard, with grade TP304, 316, 321, 310S, TP347, etc. Pipes with Diameter from 6MM to 630MM, Wall Thickness from 1MM to 20MM and length 4 to 12 meters. steel pipe Standard: ASTM