Surface Roughness in High Speed Turning of Alloy Steel M303 Using Carbide Tools in Dry Cutting Condition

M303 is a corrosion resistant martensitic chromium steel offering excellent toughness, corrosion, and wear resistance, characterized by improved machinability polish ability. It widely utilized in industries such as mould die making, machinery automotive equipment, bearing housing, tooling. Recently, this material has also been used locomotive housing. This paper presents surface roughness achieved the turning process of dry cutting condition using coated uncoated carbide tools. The parameters included high speed regime (260-340 m/min) feed rate at 0.1-0.2 mm/rev, suitable for finishing process. experiment was conducted according to Taguchi method (L18). Average (R<sub>a</sub>) range 0.395-1.356 μm, which mirror finish certain conditions that could eliminate grinding Results were analysed Analysis Variance (ANOVA) linear models revealed main significant factor contributing roughness, followed type tool, speed. These findings show good dition, therefore it recommended acceptable R<sub>a</sub> values are obtained con use flooding normally practiced industry.