Hardbending is a wear–resistant protective metal coating welded by electric welding in a protective gas environment to the outer surface of the drill pipe lock to increase the lock life and reduce
casing wear.
The patented carbide surfacing on the locks of the Hilong drill pipes of the Born series includes trademarks:
BoTn 1000 HB
BoTn 3000 HB
BoTn 5000 HB
