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Different grades of austempered ductile iron and the corresponding mechanical properties.
| Identification Grade | American Standard Grade Based on ASTM89 | Ultimate Tensile Strength (Mpa) | Strength at Yield (Mpa) | Percentage of Elongation (%) | Range of Hardness (in Brinell Standard) |
|---|---|---|---|---|---|
| A | 130-90-09 | 895.70 | 620.10 | 9 | 269–341 |
| B | 150-110-07 | 1033.50 | 757.90 | 7 | 302–375 |
| C | 175-125-04 | 1205.75 | 861.25 | 4 | 341–444 |
| D | 200-155-02 | 1378.00 | 1067.95 | 2 | 388–477 |
| E | 230-185-1 | 1584.70 | 1274.65 | 1 | 402–522 |
