Abstract : Drilling super duplex stainless steel (SDSS 2507) is challenging because of its high strength and poor thermal conductivity, which lead to excessive heat generation during machining. In conventional flood cooling, the generated heat is not sufficiently dissipated, and prolonged exposure to cutting fluids can pose health risks to operators. Cryogenic cooling, particularly using liquid nitrogen (LN₂), offers an effective alternative for machining hard-to-cut materials. This study evaluates the drilling performance of a multilayer coated tool (AlCrN + TiN) on SDSS 2507 under dry and cryogenic LN2 environments. Experiments were carried out at different cutting speeds (40, 50, and 60 m/min) and feed rates (0.04, 0.06, and 0.08 mm/rev), while maintaining a constant drilling depth of 20 mm. The influence of cooling conditions on thrust force, cutting temperature, surface roughness, micro-structural characteristics, and tool wear was systematically examined. The results indicate that cryogenic drilling significantly improves machining performance compared to dry drilling. Reductions of up to 40% in thrust force, 52% in cutting temperature, and 52% in surface roughness were achieved under cryogenic conditions. Micro-structural analysis confirmed improved surface integrity, and tool wear was notably lower when LN2 was used, demonstrating the effectiveness of cryogenic cooling for drilling SDSS 2507.