Element Gray Iron
Malleable Iron
(As White Iron) Ductile Iron Steel
Carbon 2.0 - 4.0 1.8 - 3.6 3.0 - 4.0 <2.0
aSilicon 1.0 - 3.0 0.5 - 1.9 1.4 - 2.0 0.2 - 0.8
Manganese 0.40 - 1.0 0.25 - 0.80 0.5 - 0.8 0.5 - 1.0
Sulfur 0.05 - 0.25 0.06 - 0.20 <0.12 <0.06
Phosphorus 0.05 - 1.0 0.06 - 0.18 <0.15 <0.05