... pressure loss completely interchangeable with the API drill pipe oil steel casing1) OD: 2 7/8", 3 1/2", 4", 4 ... 1/2", 5" 5-1/2" 2) Steel Grade: E75, X95, G105, S135 3) All drill pipe are ... output of 100000 tons to 150000 tons.Items: Elbow,Tee,Cross,Socket,Union,Bushing,Backnut, Nipple,Crossover, Caps,Plug etc.We ... and abroad contact with us and promote business relations. oil steel casing