Cast Iron Rectangle/Flat Bar 65-45-12 is normally used for industrial, machine, and automotive applications. 65-45-12 possesses excellent machinability with good surface finishes along with optimal impact strengths. This material is electrically conductive, and has high magnetic permeability. 65-45-12 has the same tensile and yield strengths as AISI 1020 steel in the as-rolled condition.