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.Perform series of steels are low carbon microalloyed steels that are thermomechanically rolled. The 650 in the title refers to the minimum yield strength in MPa (94 ksi). The USA equivalent is Perform 94. Developed more than 30 years ago by ThyssenKrupp Steel Europe, PAS steels (low-pearlite special structural steels), from now on offered under the brand name Perform, meet these requirements in full.