Cast irons have excellent castability and machinability (welding is possible but not recommended).
Cast irons have poor resistance to chemical agents, so they must be protected by an anti-corrosion coating, which also improves their decontaminability.
For biological protection, the cast irons used are grey cast irons, in particular grades GJL-200 and GJL-250 (NF EN 1561).
Cast irons are non-combustible, with a melting point above 1,000°C.
Cast iron is used to make massive protective screens by moulding, with machining for making finished shapes.
It is used for window frames and Airshield biological protection screws.
They have excellent resistance to gamma radiation.
However,under neutron flux, cast irons produce capture gamma rays, withenergies between 1 and 10 MeV, and activate at highly variable levels depending on the level of impurities (presence of Mn, CO, Ti, etc.).
Under very high neutron flux, the transition temperature (brittlefracture / ductile fracture) also increases.