1.Standard: API, ASME, B36.10M 1996, JIS, DIN, GB8162, GB8163, GB5310 2.Size: 1/2 to 32 inches 3.WT:Sch10 to SchXXS 1.Material: ASTM A106 GRB/A53 GRB/API 5L GRB/API 5 CT/Q345/A335/ST37/ST522.Surface treatment: black rust-proof oil, transparent oil, hot galvanizing, 3PE, epoxy coating3.Applications range: petroleum, chemical, power, gas, metallurgy, shipbuilding, construction4.Customized ...