HERCULOY 420, also known as Revere Alloy No. 420, is a high silicon bronze having mechanical properties of mild steel and corrosion resistance of copper. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Cu-24. Producer or source: Revere Copper and Brass Inc..