Colmonoy No. 21 is a nickel-base alloy for repairing cast iron parts. The deposit has high oxidation resistance, develops a hardness of Rockwell C 26-31, and is easily finished by filing or grinding. This datasheet provides information on composition, physical properties, and hardness. It also includes information on machining, joining, and powder metal forms. Filing Code: Ni-504. Producer or source: Wall Colmonoy Corporation.