That’s a matter of degree. Iron gets reactive and form some oxide at high temperature. This can be worked around by controlling the atmosphere or adding reducin

That’s a matter of degree. Iron gets reactive and form some oxide at high temperature. This can be worked around by controlling the atmosphere or adding reducing elements or oxygen traps. Other metals like magnesium just burn, which is much harder to work around. You need to go much higher in temperature than the usual manufacturing conditions to make iron burn in a normal atmosphere.