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Gray Cast Iron Class 20 (ASTM A48)
Chemical Composition
| Element | Symbol | Average Preferred Range % |
| Carbon | C | 3.25-3.5 |
| Manganese | Mn | 0.5-0.9 |
| Silicon | Si | 1.8-2.3 |
| Nickel | Ni | 0.05-0.2 |
| Copper | Cu | 0.15-0.40 |
| Chromium | Cr | 0.05-0.45 |
| Molybdenum | Mo | 0.05-0.1 |
| Sulfur | S | 0-0.15 |
| Phosphorus | P | 0-0.2 |
| Iron | Fe | Balance |
Mechanical Properties
| Property | Metric Values | Imperial Values |
| Tensile Strength Min | 138 MPa | 20 ksi |
| Yield Strength Min | 98 MPa | 14.2 ksi |
| Elongation Min % | 9.6% | 9.6% |
| Hardness (Brinell) | 156HB | 156HB |
Comparative Specifications
Applicable Casting Processes