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Funny that you would say that. We had huge ovens that we used to dry electrical equipment. There was lots of iron and steel in that equipment. We didn't have a problem with rust at all.
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Not enough detail on your scenario for me to comment. If the equipment itself was made of iron and steel, and designed to operate in a wet environment, then my guess is the metal was plated or otherwise coated to prevent oxidation. Or some kind of stainless steel may have been used.
I just know from personal experience with my attempt to dry wet maille in the oven, as well as from watching hot, wet gunbarrels develop flash rust while drying, that heat, as usual, accelerates most chemical reactions, including the oxidation of metal.
https://van.physics.illinois.edu/qa/listing.php?id=485
4) Hot iron rusts faster than cold iron -- typically heat speeds up chemical reactions. This is one reason why mufflers and exhaust manifolds in cars get rusty very quickly (unless they are coated or made out of non-rusting materials).
Steve