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.CARPENTER MICRO-MELT M-42 alloy is a super-high-speed tool steel produced by powder metallurgy. This production technique results in a more uniform structure, greater ease of grinding, improved wear resistance and toughness than is characteristic of conventionally produced high-speed tool steels.