CBSE Class 10 Answered

Process of rusting is as given below:

For iron to become iron oxide, three things are required: iron, water and oxygen. Iron does not react with water directly. When a drop of water hits an iron object, two things begin to happen almost immediately. First, the water, a good electrolyte, combines with carbon dioxide in the air to form a weak carbonic acid, an even better electrolyte. As the acid is formed and the iron dissolved, some of the water will begin to break down into its component pieces -- hydrogen and oxygen. The free oxygen and dissolved iron bond into iron oxide.

So for rusting steam water is not required at all.