Austempered ductile iron (ADI) is finding an ever increasing worldwide market in the automotive and other sectors. It offers a range of mechanical properties superior to those of other cast irons, and shows excellent economic competitiveness with steels and aluminum alloys.
ADI is a heat treated form of as-cast ductile iron. The heat treat process, austempering, was developed with the intent of improving on the strength and toughness of ferrous alloys. Ductile iron, with its relative low cost and ease to manufacture, has been one of the largest beneficiaries of the austempering process.
| Mechanical Properties measured on test pieces from separately cast samples. | ||||
| Material Symbol | Number | Tensile Strength N/mm2 (min) | 0.2% Proof Stress N/mm2 (min) | Elongation % (min) |
| En-G-JS-800-8 | EN-JS1100 | 800 | 500 | 8 |
| EN-GJS-1000-5 | EN-JS1110 | 1000 | 700 | 5 |
| EN-GJS-1200-2 | EN-JS1120 | 1200 | 850 | 2 |
| EN-GJS-1400-1 | EN-JS1130 | 1400 | 1100 | 1 |
| Standard for full details | ||||
| Grade | Tensile Strength (min) | Yeild Strength (min) | Elongation % | Impact Energy | Typical Hardness BHN | |||
| Ksi | Nmm2 | Ksi | Nmm2 | Ft-lbs | Joules | |||
| 1 | 125 | 850 | 80 | 550 | 10 | 75 | 100 | 269-321 |
| 2 | 150 | 1050 | 100 | 700 | 7 | 60 | 80 | 302-363 |
| 3 | 175 | 1200 | 125 | 850 | 4 | 45 | 60 | 341-444 |
| 4 | 200 | 1400 | 155 | 1100 | 1 | 25 | 35 | 388-477 |
| 5 | 230 | 1600 | 185 | 1300 | -- | -- | -- | 444-555 |