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.LESCALLOY UT-19 VAC-ARC is a premium quality carburizing steel with high hardenability. It is produced by vacuum are remelting (VAR) to provide a preferred ingot solidification and superior microcleanliness. It is used for aircraft gears, pinions and other carburized parts that require a high minimum core hardness.