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.ALCHROME ALLOY 750 is an iron-chromium-aluminum resistance alloy operable at temperatures up to 1900 F (1038 C). It is usually used in medium-to-heavy wire sizes. Because of its higher resistivity than nickel-chromium alloys it is often specified where space is a factor.