Drill Pipe 1.OD:3 1/2,4",4 1/2",5",5 1/2" 2.Steel grade: E75,X95,G105,S135 ... SPEC7. B. The grade of steel are determined according to the requirements of Group 1 & Group 3 of API ... , which can reduce the casing wear to the least, and its wear to casing is less than 11% of ... with little splash and good rewelding preformance F. Friendly to environment Detail Mechanical Property of the Drill Pipe: ...