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Ductile Iron Chemical Components

Ductile iron is also called as nodular iron or SG iron. Its chemical components did not have strict range for many material standards, however, its range should be useful for buyers to evaluate the quality of cast iron.

Therefore, we filled some normal standards to show the reasonable range to ductile iron. Please remember the chemical components are only a reference, not a strict standard to the material. The foundry could adjust its chemical components according to their experience in order to meet the physical properties. So, physical properties should be the only standard to materials.

Chemical Components of Ductile Cast Iron 

USA

Germany

ISO

C %

Si %

Mn %

P %

S %

Mg %

Cu %

Sn %

60-40-18

GGG40

400-18

3.50-3.78

2.80-2.85

0.2-0.5

0.03-0.06

0.02-0.035

0.020-0.060

 

 

65-45-12

GGG40

450-10

3.30-3.80

2.40-2.90

0.2-0.5

0.03-0.06

0.02-0.040

0.020-0.060

 

 

70-50-05

GGG50

500-7

3.20-3.60

2.30-2.90

0.4-0.6

0.03-0.06

0.02-0.040

0.030-0.055

<0.4

 

80-60-03

GGG60

600-3

3.00-3.50

2.40-2.80

0.3-0.5

0.03-0.06

0.02-0.040

0.035-0.050

0.30-0.40

 

100-70-03

GGG70

700-2

3.65-3.90

1.70-1.90

0.3-0.5

<0.06

<0.03

0.035-0.050

0.30-0.40

0.03-0.06

120-90-02

GGG80

800-2

-

-

-

-

-

-

-

-

As for the middle and large iron foundries in China, they have capability to inspect the chemical component during production and after production by chemical analysis lab or by spectrometer. So, they could issue the inspection reports to their clients. The buyers could send their samples to third party for inspection verification. However, most clients will not do this verification. It is because there is no strict chemical requirements for ductile iron, the only acceptance standard to cast iron should be physical properties, such as tensile strength and hardness. In other words, even if the chemical components were out of the normal ranges, but the physical properties are qualified, then the castings were still qualified. The chemical components are just a reference data.

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