Ferrite is a interstitial solid solution in which carbon is dissolved in α-Fe, and is usually represented by the symbol F. Ferrite has a body-centered cubic lattice with a low carbon solubility. It can only dissolve 0.0008% of carbon at room temperature, and the maximum carbon solubility at 727 °C is 0.02%. It is called ferrite or α solid solution, which is represented by α or F. α is commonly used in the icon, and F is commonly used in the text. The austenite of the hypoeutectoid component is precipitated to form ferrite.