The following is the chemical composition, mechanical properties of DIN 1691 GG30 Gray Cast Iron.

Characteristics of DIN 1691 GG30 Gray Cast Iron:
DIN 1691 GG30 Gray Cast Iron is alloyed to achieve the properties, giving excellent wear resistance, strength & heat-treatment response compared to GG20 and GG25, while still possessing reasonable machinability and an excellent surface finish. Noise and vibration damping are excellent in this grade.

Chemical Analysis of DIN 1691 GG30 Gray Cast Iron:
Carbon 2.90-3.45%
Silicon 2.10-2.90%
Manganese 0.45-0.70%
Sulphur 0.10% max
Phosphorous 0.30% max
Iron balance
As for normal grey iron, the chemical composition is not important comparatively. The iron foundries could adjust the compositions according to their experience as long as they could meet the physical and mechanical requirements.

Physical Properties of DIN 1691 GG30 Gray Cast Iron:
Density ρ 7.25 g/cm³ at 20 °C
Thermal Specific heat capacity cp 460 J/(kg.K) at 200 °C
Electrical resistivity ρel 7E-7 Ω.m at 20 °C

Mechanical Properties of DIN 1691 GG30 Gray Cast Iron:
Elastic modulus E 108 - 137 GPa at 20 °C
Hardness, Brinell HB 265 - 285 [-] at 20 °C
Plane-Strain Fracture Toughness KIC 17.7 MPa.√m at 20 °C
Poisson's ratio ν 0.26 [-] at 20 °C
Shear modulus G 41 GPa at 20 °C Typical for Cast Iron
Tensile strength Rm 190 - 400 MPa at 20 °C

Equivalent Grade for DIN1691 GG30 Grey Cast Iron

Applications of DIN 1691 GG30 Gray Cast Iron:
DIN 1691 GG30 Gray Cast Iron is suitable for applications where good wearing characteristics are required and when components need a combination of strength and wear resistance superior to those of other cast iron grades. Typical applications include, dies, bearings, moulds and gears.

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