6294 3940

Ductile Iron
Item required


Common Name:

ASTM A.536: 65-45-12
BS2789: SNG 27/12
AS1831: 400-250-12
DIN1693: GGG40


Typical Chemical Analysis:

Aluminum (AI): <0.01%
Copper (Cu) : <0.05%
Nickel (Ni): 0.02% - 0.04%
Phosphorus (P): <0.1%
Silicon (Si):2.3 – 2.7%
Sulfur (S): <0.01%
Manganese (Mn): 0.2 %– 0.4%
Carbon (C): 3.3% - 3.8%
Magnesium (Mg): 0.03% - 0.05%
Chrome (Cr) : <0.01% - 0.03%
Molybdenum (Mo): <0.01%
Titanium (Ti): <0.05%


Typical Physical Properties:

Hardness (HB): 187 Max.
Tensile Strength: 415 MPa Min.
Machinability: Excellent


Fabrication Practices:

Joining /solderability: Joining by nickel-iron electrode (containing 55% nickel and 45% Fe) is excellent
Resistance wielding: Not recommended
Brazing: Silver alloy brazing
Oxyacetylene wielding: Good
ARC wielding: Good



The composition and handling of ductile irons are very similar to those of gray irons. The difference between the two irons is that solidified graphite is spherical in ductile iron but in flake form in gray iron. Ductile iron, as the name implies, has high ductility with resulting high impact strength for shock load applications. At elevated temperature, due to better resistance towards oxidation, ductile iron displays better corrosion resistance than grey iron.
Gears subjected to impact loading, generator shafts, pump bodies, glands, glass mould, spur gears, worm gears, sprockets, heavy duty gears, rotors.


Download as PDF