Drill Pipe 1.OD:3 1/2,4",4 1/2",5",5 1/2" 2.Steel grade: E75,X95, ... size and shape B. Good low temperature toughness C. Excellent comprehensive mechanical properties D. High connection strength ... low friction factor B. Good adhesion and flexility C. High application temperature and pressure D. High hardness ... 3 times of the tool joint service life C. Good property of friction-reduction, which can ...