Coronary stents are used primarily to treat coronary artery disease, a condition where the arteries that supply blood to the heart become narrowed or blocked due to the buildup of plaque. Coronary stents play a crucial role in improving blood flow to the heart and reducing the risk of complications associated with coronary artery disease., yet the mechanical behavior of these devices under physiological conditions remains crucial for their efficacy and safety. This study aims to investigate the stress and strain distribution in coronary stent expansion, exploring how different materials influence these mechanical properties. The analysis was carried out for three materials: stainless steel 316L, Elgiloy alloy (Co-Cr-Ni alloy), Austenitic, and Martensitic Nitinol (Ni55Ti45). Finite element analysis is employed to model the biomechanical behavior of stents on coronary walls when it is expanding. The model will be simulated by using ANSYS R21. Through detailed simulations, the research identifies the von-Mises stress of the stent when expanded from 0 to 3 MPa. As a result, the mechanical performance of austenitic nitinol is superior to that of other materials. This research underscores the importance of material selection in optimizing stent design for enhanced efficacy and durability. This study informs future advancements in stent engineering and cardiovascular interventions by providing valuable insights into the mechanical behavior of coronary stents, particularly with nitinol.