Grey cast iron class 30 vs Grey cast iron
Property comparison of Grey cast iron class 30 and Grey cast iron, both cast iron.
| Property | Grey cast iron class 30 | Grey cast iron | Difference |
|---|---|---|---|
| Yield strength | 207 MPa | 300 MPa | +45% |
| Tensile strength | 207 MPa | 300 MPa | +45% |
| Elastic modulus | 100,000 MPa | 85,000 MPa | -15% |
| Shear modulus | 40,000 MPa | 34,000 MPa | -15% |
| 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 | 490 J/kg·K | 490 J/kg·K | 0% |
| 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 Grey cast iron class 30. 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
- ANSI
- standard
- JIS
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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