Specification :

Basic Parameters
Theory Drilling depth 1500m
Outer diameter 70.5mm
Inner diameter 60.5mm
Length 3m/10ft; 1.5m/5ft
weight for 3 meter length NQ drill pipe 24 kg/pcs
Raw Material steel grade 30CrMnSia/XJY850
Standard GB/T816-2008
Treatment Heat treatment the whole pipe
Tensile strength £¨MPa£©£º1060
Yield strength £¨MPa£©£º1000
Elongation after Ultimate strength %£º 18
Surface hardness(Brinell)£º270~295
Eccentricity (Radial run-out)£º%8 of pipe thickness