SAE 1080 steel is a high carbon steel and after forging must be isothermally annealed after forging at 30 -40 degree centigrade below Ac1 and then reheated to 780+/- 10 ,holding for 1inch /hour and quenched in oil followed by tempering at 300 degree .C.To achieve higher hardness cyclic quenchinf and tempering is recommended.