I don't know the flat metal plate, but the circle is made from brass, so I expect both are brass.
The ceramic stuff. I don't think its ever gonna melt back into steel... No matter how hot you get it.
I have always separated it out & thrown it into the rubbish pile. Its not metal.
Theres no way I'd put it in with the iron or steel, to me thats just plain dishonesty.
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