... , H,J, N,C,D, E. 3.Usage: Seamless Steel Oil Well Casing, Tubing and Drill Pipe. Standard: JIS G3439Grade: STO-G ... -N,STO-C, STO-D, STO-E.Usage: Seamless Steel Oil Well Casing, Tubing and Drill Pipe.FOB Price/MT:USD700-1 ... ,680.00MOQ:10MT Stanard Name: Seamless Steel Oil Well Casing, Tubing and Drill Pipe.Surface: Annealed/Pickled/Polished.Ends ...