... 0.24--1.97 (6-50mm) material carbon steel, special carbon steel, Q235,Q345,X46,X60,X70,X80 ... 12.5m,steel grade could be simple carbon steel,special type steel and low alloy steel ... as petroleum pipeline, natural gas pipeline, urban pipe network, mines pipeline,Coal Water Slurry pipeline, ... and construction pipe for high voltage, wind power, bridges, ...