PURPOSE: To form an oxidation resistant chilled layer on the surface of cast iron without deteriorating the castability or forming pores by adding Al to the locally remelted part of the surface of the cast iron.

CONSTITUTION: The surface of a material such as graphite cast iron is locally remelted with a TIG arc welder while Al is added. The material is than allowed to cool. The remelted part is chilled by rapid cooling by the cooling action of the unmelted part. The addition of Al is carried out by feeding an Al rod under heating to the remelted part or by previously placing an Al plate, Al foil or Al powder on the part to be remelted. By this method, the formation of pores by carbon monoxide is inhibited. A chilled layer formed by this method has superior oxidation resistance.