Aspects of this topic are discussed in the following places at Britannica.
...pure form occur. Delta iron, characterized by a body-centred-cubic crystal structure, is stable above a temperature of 1,394° C (2,541° F). Below this temperature there is a transition to gamma iron, which has a face-centred-cubic structure and is paramagnetic (weakly affected by a magnet); its ability to form solid solutions with carbon is important in steelmaking. At 912° C...
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