The apron area is the enclosed area of secondary cooling. That is after the billet comes out of the mould tube and before it enters withdrawal. In this area because of heavy cooling of hot billet lot of steam is generated which is very highly corrosive. Steam exhaust systems are used to evacuate the steam. Still, it comes in contact with the steel structure within this area resulting in corrosion. As in our caster, we follow a scientific process of surface preparation and aluminum paint, corrosive steam is unable to damage the steel. The steel structures in the apron area of our first commissioned caster are intact even today.