Durelloy pre-machined is a fine grained,
stress relieved, electric furnace alloy. It is
heat treated to Rockwell C 28–32, Blanchard
ground top and bottom +.020/.030 – .000,
width +1/8” – .000.
A machinability rating of 80% means Durelloy-PM is ready for use in most tooling applications with no further heat treating. Durelloy-PM can be flame-hardened to 578/698 BHN for applications in which a higher hardness is required at wear points.