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GRAY IRON PROPERTIES |
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| Type | G1A | G1 | G2 Class 40 |
| Tensile strength (psi) | 25,000 | 30,000 | 40,000 |
| Compressive strength (psi) | n/a | 120,000 | 150,000 |
| Heat-treat response | n/a | Rc 40 min. | Rc 50 min. |
| Hardness (BHN) | |||
| 3/4" - 1-1/2" | 159-229 | 179-235 | 229-285 |
| 1-1/2" - 3" | 156-201 | 163-229 | 207-277 |
| 3" - 6" | 143-201 | 151-229 | 197-268 |
| 6" - 20" | 143-201 | 143-201 | 183-269 |
| Microstructure | Highly ferritic | Partially ferritic | Highly pearlitic |
