Ductile iron is a family of cast graphitic irons which possess high strength, ductility and resistance to shock. Annealed cast ductile iron can be bent, twisted or deformed without fracturing. Its strength, toughness and ductility duplicate many grades of steel and far exceed those of standard gray irons.
Parts and Materials List
| Parts | Material |
| Body | FCD 45 |
| Bonnet | FCD 45 |
| Disc | SUS 410 |
| Stem | SUS 410 |
| Packing nut | FCD 45 |
| Packing | Graphite |
| Body seat ring | SUS 410 |
| Disc ring | PTFE+15%G.F.T |
| Handwheel | FCD 45 |
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