What is SG Cast Iron 🧇

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Tanveer Engineering 


  SG Cast Iron

A type of cast iron that is distinguished by its particular microstructure is called nodular cast iron (ductile iron), sometimes called malleable cast iron. Nodular cast iron contains spherical (knotted) graphite particles, unlike the flake graphite found in ordinary cast iron. Ductile iron has better mechanical properties than grey cast iron due to the change in graphite morphology.


Important properties of ductile iron:


1. High strength: Suitable for mechanical and structural applications, with strength comparable to steel.


2. Ductile: Ideal for applications requiring toughness; able to deform under force without breaking.

3. Great resistance to wear: works well in abrasive conditions.

4. Good processability: easy to process and form into components. 5. Impact resistance: Absorbs impact loads better than other types of cast iron. Application:

Automotive components (e.g. crankshafts, gears and suspension parts)

Pipe fittings and valves

Manhole covers and grates

Machine bases and frames

Heavy industrial applications requiring high strength

Composition:

Nodular cast iron typically contains:

Carbon (C): 3.0–4.0%

Silicon (Si): 2.0–3.0%

Manganese (Mn): 0.1–0.3%

Magnesium (Mg): added to give the graphite a spheroidal shape

The addition of magnesium is essential because it changes the structure of the graphite during solidification.


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