We could manufacture high strength drilling pipes for rock mine , and choose  AISI 4330 V   forging material , it could afford hight strength and high torsion , the diameter range is 8 1/4”~22”

Our drill pipes have the advantage of being able to recut the DI-22 threads when necessary, giving them a more useful lift. With the same purpose our 8 1/4″, 10 1/4″ ,11 1/2″ & 17 1/2″ drill pipes have more shouder area between connections comparing with conventional ones.