Ferritic steels(Ferrite)

Ferritic steels consist of crystals of ferrite, a form of iron that contains only a very small amount (up to 0.025%) of carbon. Ferrite absorbs such a small amount of carbon due to its body-centered cubic crystal structure - one iron atom at each corner and one in the middle. Ferrite, when heated at a temperature of approximately 475°C, is segregated into isomorphic areas enriched and depleted in chromium, which reduces the ductility of the steel. This effect is referred to as the so-called "brittleness 475°C".

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