So its not so much how do forges melt metals, so much as How do forges melt steel and transport the molten steel without melting the container containing the steel as well. This part has always nagged me in the back of my head and I always forget to find out how this is possible.
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They use something called a refractory material to line the various containers, and these are a bit like the tiles on the space shuttle, very VERY resistant to heat. They do need to be replaced on a regular schedule, but they keep the containers from melting on the surface.
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