I don't think you can overheat in a normal campfire type situation. You can't get a regular campfire much over 1000f.
We had a cast iron rust removal party at one rondy I attended and we lined the big bonfire with rusty skillets and dutch ovens. Must have been a dozen or two big pieces of metal in there. We had every piece of cast iron in that fire glowing yellow hot. The next morning we pulled them out and I do not remember a single one of them cracking or showing damage.
I would say you should cool them slowly or just let them cool as the fire dies. They will still be too hot to touch long after the ashes are cold.
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