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.ALLEGHENY LUDLUM TYPE 201 stainless steel is similar to Type 301 in many ways, with applications ranging from structural members to auto wheel covers. The alloy can be substituted for Type 304 in a variety of mild environments.