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 M33 is a heavy-duty high-speed steel; it contains 8.00% cobalt to improved red hardness. It is recommended for cutting-tool applications in which wear resistance and high temperature hardness are important characteristics. It should not be used where excessive shock and/or chatter are encountered. AISI Type M33 is well suited to uses such as machining hard and heat-treated materials and machining both ferrous and nonferrous aircraft alloys.