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.ARMCO 17-4 PH, a precipitation hardening stainless steel, is widely accepted in a broad range of industries. High strength, excellent corrosion resistance, ease of heat treatment and good weldability make it an important alloy to designers and engineers.