Standard: GB, ASTM, API Outer Diameter: 18 - 460 mm Thickness: 3 - 60 mm -product ... ,Boiler industry16-824×2-100 Casing pipe J55 N80, P110API SPEC 5CT-- oil pipe for oil well, Coupling Cylinder60-630×1 ... .5-4.5 line pipe 5L GR.B, X52,X60 API-for petroleum,natural gas, industrial dilivery(gas,water,oil)60 ...