Drill Pipe 1.OD:3 1/2,4",4 1/2",5",5 1/2" 2.Steel grade: E75,X95,G105,S135 3. ... MOQ:25 tons 4.Certificates : API 5DP,API7-1 Main feature: A. The drill rods comply with the ... . B. The grade of steel are determined according to the requirements of Group 1 & Group 3 of API SPEC 5D. C. ... friction-reduction, which can reduce the casing wear to the least, and its wear to casing is less than 11% of that ...