In this study, the primary focus is on aligning machining practices with sustainability goals to achieve net-zero emissions. Wet machining, the widely practiced method, involves the use of cutting fluids, which pose significant environmental risks. These risks include the generation of hazardous waste, potential fluid leakage or spillage, soil and water contamination, and adverse health effects through inhalation, skin contact, or ingestion. Moreover, cutting fluids can cause corrosion of machine components and workpieces. To address these issues, an alternative approach known as dry machining is chosen to mitigate environmental impact, reduce costs, and enhance workplace safety. Dry machining requires proper machining parameters to achieve a good surface finish of the workpiece. Considering environmental concerns regarding industrial waste generated during machining, there is a need for greater attention to dry machining. Further exploration into dry machining techniques, especially concerning harder metals like duplex steels, is crucial. Duplex steel (DSS 2205) and super duplex steel (SDSS 2507) were selected for analysis due to their exceptional strength and corrosion resistance properties, particularly advantageous in marine applications. High-speed CNC dry milling of duplex stainless steels with optimum cutting parameters offers substantial sustainability and performance benefits. By eliminating the need for cutting fluids, dry machining reduces environmental impact by minimizing chemical usage and waste generation. Additionally, it can improve surface finish and dimensional accuracy by eliminating coolant-related issues, such as chip evacuation problems or thermal distortion. Furthermore, dry machining enhances productivity by reducing downtime associated with coolant setup and maintenance. Overall, dry machining presents a sustainable and efficient solution for machining DSS, aligning with net-zero initiatives by reducing resource consumption and environmental footprint.