This category of steel is normally referred as fine high class steel which is quite appropriate to be made into tools. The grades that are part of tool steel group are differentiated from other categories of steel on the basis of their distinctive hardness, high resistance to abrasion, resistance to deformation at elevated temperatures and their ability to hold a cutting edge. Tool steel is generally used in a heat treated state for the purpose of getting good performance and increasing the life of material. There are many grades in tool steel that are used in different applications.