CPM-S30V is a type of stainless steel that was designed specifically for knife blades. It offers excellent wear resistance, meaning that the blade will retain its sharpness for a long time. It also has good corrosion resistance, even better than other popular stainless steels like 440C or 420HC. The steel is made using a powdered process, which helps refine the grain and enhance the overall performance of the blade. While it is tough, it is not as tough as some other stainless steels made using the same process.