Process for obtaining nodular gray cast iron as cast in metal chill-mold in one and the same casting installation which produces ferritic flake graphite gray cast iron, the installation consists of: - at least one melting furnace - at least one maintenance furnace - at least one transfer ladle for transferring the molten load from the melting furnace to the maintenance furnace - at least one distribution ladle for passing the loads of the melting furnaces to the casting ladle - at least one casting ladle fed by the distribution ladle - at least one carousel with at least one metal chill-mold in which the material is discharged from the casting ladle characterized in that it comprises the steps of: a) feeding a casting load to the melting furnace; wherein, the equivalent carbon content in the melting furnace is 4.7 to 4.90; b) transferring the molten material from the melting furnace to the maintenance furnace by means of the transfer ladle; c) pouring the material from the maintenance furnace in the distribution ladle adding thereto a nodulizing agent and an inoculant; so that after the treatment with the inoculant and the nodulizing agent, the molten material in the distribution ladle has the following composition: 3.60-3.80% C; 2.80-3.00% Si; 0.65-0.75% Mn, 0.008-0.013% S and 0.10-0.15% P; d) feeding said at least one casting ladle with the material from the distribution ladle, wherein an additional amount of inoculant is added in the casting ladle; e) casting the material from the casting ladle in said at least one a metal chill-mold by gravity; and f) cooling and demolding the part once solidified. - at least one melting furnace - at least one maintenance furnace - at least one transfer ladle for transferring the molten load from the melting furnace to the maintenance furnace - at least one distribution ladle for passing the loads of the melting furnaces to the casting ladle - at least one casting ladle fed by the distribution ladle - at least one carousel with at least one metal chill-mold in which the material is discharged from the casting ladle characterized in that it comprises the steps of: a) feeding a casting load to the melting furnace; wherein, the equivalent carbon content in the melting furnace is 4.7 to 4.90; b) transferring the molten material from the melting furnace to the maintenance furnace by means of the transfer ladle; c) pouring the material from the maintenance furnace in the distribution ladle adding thereto a nodulizing agent and an inoculant; so that after the treatment with the inoculant and the nodulizing agent, the molten material in the distribution ladle has the following composition: 3.60-3.80% C; 2.80-3.00% Si; 0.65-0.75% Mn, 0.008-0.013% S and 0.10-0.15% P; d) feeding said at least one casting ladle with the material from the distribution ladle, wherein an additional amount of inoculant is added in the casting ladle; e) casting the material from the casting ladle in said at least one a metal chill-mold by gravity; and f) cooling and demolding the part once solidified. a) feeding a casting load to the melting furnace; wherein, the equivalent carbon content in the melting furnace is 4.7 to 4.90; b) transferring the molten material from the melting furnace to the maintenance furnace by means of the transfer ladle; c) pouring the material from the maintenance furnace in the distribution ladle adding thereto a nodulizing agent and an inoculant; so that after the treatment with the inoculant and the nodulizing agent, the molten material in the distribution ladle has the following composition: 3.60-3.80% C; 2.80-3.00% Si; 0.65-0.75% Mn, 0.008-0.013% S and 0.10-0.15% P; 3.60-3.80% C; 2.80-3.00% Si; 0.65-0.75% Mn, 0.008-0.013% S and 0.10-0.15% P; d) feeding said at least one casting ladle with the material from the distribution ladle, wherein an additional amount of inoculant is added in the casting ladle; e) casting the material from the casting ladle in said at least one a metal chill-mold by gravity; and f) cooling and demolding the part once solidified.