... R780 ( 42MnMo7 ), with the specifications of the drill rod of the materials produced, and its mechanical ... core drilling, geothermal water well drilling.2. Drill rod upsetting by proper heat treatment process, ... position, greatly improving the service life of drill rod. Drill RodSpecsChickeningStyleDimensions(mm)Kg/MOutsideDiameterWallThicknessLength42InternalChickening42.5543204.6150506.543206 ...