DIN GG - 20 vs Grey cast iron
Property comparison of DIN GG - 20 and Grey cast iron, both cast iron.
| Property | DIN GG - 20 | Grey cast iron | Difference |
|---|---|---|---|
| Yield strength | 200 MPa | 200 MPa | 0% |
| Tensile strength | 200 MPa | 200 MPa | 0% |
| Elastic modulus | 85,000 MPa | 85,000 MPa | 0% |
| Shear modulus | 34,000 MPa | 34,000 MPa | 0% |
| Poisson ratio | 0.25 | 0.25 | 0% |
| Density | 7,160 kg/m³ | 7,160 kg/m³ | 0% |
| Thermal conductivity | 46 W/m·K | 46 W/m·K | 0% |
| Specific heat | 460 J/kg·K | 490 J/kg·K | +7% |
| Coefficient of thermal expansion | 0.000011 1/K | 0.000011 1/K | 0% |
| Melting point | 1,175 °C | 1,175 °C | 0% |
Difference is Grey cast iron relative to DIN GG - 20. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- standard
- DIN
- standard
- BS
About gray cast iron
Gray cast iron is the most widely produced cast iron, identified by graphite flakes that give the fracture surface a gray color. It absorbs vibration well and machines easily but has low ductility and tensile strength. Engine blocks, machine bases, brake drums, and pipe are common applications. Grades are designated by minimum tensile strength: ASTM A48 Class 30 (30 ksi) and Class 40 are typical.
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