The best replacement for ductile iron is cast iron.

The best alternatives to ductile iron are rated as following:
★★★★★  cast iron
★★★  carbon steel
★★  grey iron
★★  steel pipe
★  gray iron
★  cast steel
★  malleable iron
★  nodular iron
★  cast iron pipe
★  pvc pipe
  grey cast iron
  iron
  forged steel
  mild steel
  hdpe
  malleable

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ductile iron
cast iron
carbon steel