... 1.Product name: seamless steel pipe 2.Standard:GB, API,ASTM 3.Use:delivery fluid and gas 4.High quality, deserve to own ... structureLine pipeGr..BAPI 5L/CT21.3-813*1.5-40Carrying gas,water or oil in the industries of petroleum and ... Treatment:Transparent oil or black painting anti-corrosion2.Application:Natural gas, petroleum, chemical industry, electric power, metallurgy thermodynamic fields, water ...