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.ESSHETE 1250 is an austenitic creep resistant alloy steel recommended for high temperature service in the range 550-675 C. It is used for superheaters, pressure vessels, fasteners and turbine blades.