well drilling pipe 60-139mm G105/S135/E75/R780/DZ50 EU/ ... R2/R3 large manufactuer .best price,products and ser drilling pipe specifications: ø40,50, 60,73,89,114,127, ... 139 Drill pipe material: DZ50, R780, G105, S135 Joint material: 40Cr, 45Mn2 ... home and abroad to provide customers with the products in line with international standards to increase customer satisfaction. We have ...