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Ductile iron is cast iron whose graphite is in the form of spherical nodules making it more flexible and elastic than other cast irons. These improvements to the mechanical properties allow DI to be used in a wider range of casting applications than standard gray iron. DI has also replaced steel castings in some applications providing a lower-cost alternative.

CHEMICAL COMPOSITION OF DIFF GRADE OF DUCTILE IRON

GRADE - 800/2, 700/2, 600/3
AVG. CAST
SECTION.
TC
Si
Mn
BHN
<13 mm
3.6 - 3.8
2.6 - 2.8
0.5
245-335
13 - 25 mm
3.5 - 3.6
2.2 - 2.5
0.6
25 - 50 mm
3.5 - 3.6
2.1 - 2.3
0.7
225-305
50 - 100 mm
3.4 - 3.5
1.9 - 2.1
0.8
> 100 mm
3.4 - 3.5
1.8 - 2.0
0.8
190-270
GRADE - 500/7
AVG. CAST
SECTION.
TC
Si
Mn
BHN
<13 mm
3.6 - 3.8
2.6 - 2.8
0.3
13 - 25 mm
3.5 - 3.6
2.2 - 2.5
0.35
160 - 240
25 - 50 mm
3.5 - 3.6
2.1 - 2.4
0.40
 
50 - 100 mm
3.4 - 3.5
2.0 - 2.2
0.5
> 100 mm
3.4 - 3.5
1.8 - 2.0
0.6
 
   
GRADE - 400/12, 450/10
AVG. CAST
SECTION.
TC
Si
Mn
BHN
<13 mm
3.6 - 3.8
2.6 - 2.8
0.1
 
13 - 25 mm
3.5 - 3.6
2.2 - 2.4
0.15
25 - 50 mm
3.5 - 3.6
2.2 - 2.4
0.3
210Ma
50 - 100 mm
3.4 - 3.5
1.8 - 2.0
0.2
> 100 mm
3.4 - 3.5
1.8 - 2.0
0.25

Tensile Strength of Ductile Iron
The tensile strength, or ultimate tensile strength (UTS), is the maximum load in tension which a material will withstand prior to fracture. It is calculated by dividing the maximum load applied during the tensile test by the original cross sectional area of the sample. Tensile strengths for conventional Ductile Irons generally range from 60,000 psi (414 MPa) for ferritic grades to over 200,000 psi (1380 MPa) for martensitic grades.


DUCTILE IRON DATA FOR DESIGN ENGINEERS
Typical stress-strain curve for Ductile metals.