Patent ID: 6199618
Filing Date: 2001-03-13
Classification: C21D

Abstract:
A process for producing a casting from cast iron with lamellar graphite, the cast iron having a carbon content, the process comprising producing the cast iron from a melt obtained in a melting process in a melting furnace, adjusting the carbon content of the cast iron to approximately 3-4% carbon in the melt by controlling the melting process through adjustments in charge make-up and/or operation of the melting furnace, pouring the melt into a mold utilizing a sand-casting or lost-form method, removing the casting from the mold at a temperature in a range of 1,100-800.degree. C., subjecting the casting immediately afterward to a cooling treatment by a continuous stream of air for removing all traces of mold material from the casting, cooling selected areas of the casting to a point below the eutectoid range by short, aimed, intermittent blasts of air for obtaining improved mechanical properties, and stopping the cooling treatment after the temperature drops below the temperature of the eutectoid range.