Clean, degrease and derust workpieces, fixture and load into furnace for uniform heating.

Heat by preset curve and soak evenly to complete microstructure transformation; vacuum/protective atmosphere prevents oxidation and decarburization.

Control cooling rate as process demands—fast for quenching, slow for annealing/tempering—to obtain target workpiece properties.

Take out cooled workpieces, clean, straighten and test performance to comply with standards.