The malleable cast iron is commonly known as martensitic steel and mare iron. The production process of vermicular graphite cast iron is:
-first cast into white cast iron parts,
-and then through malleable annealing (forgeable annealing decomposes cementite into floc graphite) to obtain malleable cast iron parts.
Because graphite in the malleable cast iron is flocculent and has a small effect on the matrix, its mechanical properties are higher than gray cast iron, and its plasticity and toughness are good, but the malleable cast iron cannot be forged. The matrix structure of the malleable cast iron has different properties. Not the same, among which black heart malleable cast iron has higher plasticity and toughness, while pearlite malleable cast iron has higher strength, hardness and wear resistance.