SG Iron vs Grey Cast Iron Application Guide
Grey cast iron offers excellent machinability and vibration damping, making it suitable for machine beds, housings, and applications where stiffness and cost efficiency matter.
SG iron (ductile iron) provides higher tensile strength and ductility, preferred for load-bearing components, suspension parts, and applications requiring impact resistance.
Material selection should consider operating environment, load case, fatigue requirements, and machinability constraints. Wrong grade selection creates field failures or excess cost.
Work with your supplier to confirm grade, heat treatment, and machining allowances before tooling investment.