View Sample Alloy Digest Data Sheet (PDF)Since 1952, Alloy Digest has been the leading reference for materials property data on metals and alloys used throughout the world. Featuring graphs, charts and tables, these sheets give facts and figures on composition or characterization, physical and mechanical properties, heat treatment, and machinability.AISI Type M3 is a high-carbon, high-vanadium, molybdenum-type of high-speed steel. Its composition provides marked improvement in abrasion resistance, when compared with the other standard high-speed steels. It is especially well suited for difficult cutting applications where severe abrasion exists. It is produced in two slightly different analyses: Class 1 and Class 2; Class 2 contains slightly higher percentages of carbon and vanadium and is slightly more abrasion resistant than Class 1. Among the many applications for Type M3 are broaches, milling cutters and reamers.