It doesn’t take full temperature, depending on the alloy, time of exposure can make it mailable. Different alloys require it reaching a different “Curie temperature” to anneal. Pure Iron has a Curie temp of around 1,000K but if it is an Iron/Zinc alloy, for example, is something like 20% lower.
mnehring
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My father graduated from MIT in metallurgy and worked in a steel foundry near Buffalo. (He later went to medical school, though because working in a steel foundry was very hot and loud and miserable.)
GUESS WHAT FUEL STEEL FOUNDRIES USE TO MELT STEAL?
Basically home heating oil... very similar to kerosene (jet fuel).
How do you think people who work with setell melt steel? MAGIC?
Oil, coal or natural gas. Regardless of what they use, it is fed air under pressure to optimize the combustion. The key to the process is the furnace that contains the heat.