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.MCH is a medium-carbon, high-molybdenum hot-work steel developed to supplement the medium-carbon, high-tungsten (AISI Type H24) hot-work type of steel. It is a modified high-speed steel that will attain hardness in excess of Rockwell C 60. Because of the careful selection of alloying elements, it will resist wash and abrasion at high operating temperatures. MCH is considerably tougher than either the low-carbon AISI Type M2 steel or the medium-carbon, high tungsten (H24) hot-work steel. MCH should not be water cooled in service. Best hot-work die life is obtained by preheating the dies prior to use.