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Gray Cast Iron Class 40 (ASTM A48)
Chemical Composition
| Element | Symbol | Average Preferred Range % |
| Carbon | C | 3.1-3.4 |
| Silicon | Si | 2.5-2.8 |
| Manganese | Mn | 0.5-0.7 |
| Phosphorus | P | 0.2 |
| Chromium | Cr | 0.05-0.45 |
| Nickel | Ni | 0.05-0.2 |
| Molybdenum | Mo | 0.05-0.1 |
| Sulfur | S | 0.07 |
| Iron | Fe | Balance |
Mechanical Properties
| Property | Metric Values | Imperial Values |
| Tensile Strenght Min | 40 ksi | 276 MPa |
| Yield Strenght Min | 20 ksi | 140 MPa |
| Elongation Min % | 2-3% | 2-3% |
| Hardness (Brinell) | 183HB | 183HB |
Comparative Specifications
Applicable Casting Processes