Eutectoid Steel
Steel representing the eutectoid composition of the iron carbon system, with about 0.80% to 0.83% carbon, the eutectoid temperature being about 1333 (degrees) F. Such steel in the annealed condition consists exclusively of pearlite. Steels with less than this quota of carbon are known as hypo eutectoid and contain free ferrite in addition to the pearlite. When more carbon is present, the steel is known as hyper eutectoid and contains free cementite. The presence of certain elements, such as nickel or chromium, lowers the eutedtoid carbon content.
