Heat Treatment of S.G. Irons | Cast Irons | Metallurgy
S.G. irons have nodules of graphite embedded in the matrix usually of ferrite, or pearlite, or both, depending on the thickness of the casting and/or alloy composition. As the nodule of graphite is not that serious stress-raiser, and that the ends are not that sharp (as flakes) to act as crack, the mechanical properties such as tensile strength, hardness, ductility, [...]