Composition: Iron (0.05%C aprox.).

Processing: Hot-rolled.

Etching: 10-15 s immersion in 2% nital.

This specimen is an iron with a small carbon content (0.05%). Therefore, its composition is very close to the monophasic ferrite region. The maximum solubility of C at the eutectoid temperature is 0.025%. This means that the other 0.025% should form iron carbide. Equiaxial ferrite grains predominate in the microstructure with only a few small pearlitic colonies in between them. It is also possible that some C precipitates as cementite within the ferrite grains. 

Fe-Fe₃C diagram

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