Here are some cast iron grades. Hope the table works. ???
Tim
G1A
Gray Iron Pearlite & ferrite matrix, flake graphite Moderate strength, increased machinability, excellent damping G2 Class 40
Gray Iron Pearlite matrix, flake graphite Moderate strength, good wear as-cast, excellent damping G2 Heat Treated
Gray Iron Martensitic matrix, flake graphite Best wear in a non-alloyed ferrous metal, moderate strength, tooth sections >.250", good damping Same as above, better wear resistance
G2 Alloyed
Gray iron Pearlite or martensitic matrix, alloyed carbides, flake graphite Improved wear over class 40 grade or quench and tempered class 40 grade; increased wear resistance with higher chrome levels. 65-45-1
Ductile Iron Ferrite with 20% pearlite matrix , nodular graphite Good machinability, size control after heat treatment 80-55-06
Ductile Iron Pearlite with 15% ferrite, nodular graphite Higher strength, higher hardness, increased wear; good heat treat response when flame or induction hardening 100-70-02
Ductile Iron Ferrite with 50% pearlite matrix, nodular graphite Good wear resistance without heat treating Austempered
Ductile Iron Ausferrite matrix with nodular graphite