... R1/R2/R3 large manufactuer .best price,products and servi drill pipe specifications: ø40,50, 60,73,89,114,127,139 ... Drill pipe material: DZ50, R780, G105, S135 Joint material: 40Cr, 45Mn2, 35CrMo, ... home and abroad to provide customers with the products in line with international standards to increase customer satisfaction. We have been ...