A 500kg valve sand casting with an induction furnace.
You may find your answer at the following link:
https://www.pentictonfoundry.com/news/austenitic-ductile-iron-astm-a439-grade-d2-58-30-8/
https://nickelinstitute.org/media/1770/propertiesandapplicationsofni_resistandductileni_resistalloys_11018_.pdf
Optimum pouring temperature for 500kg ASTM A439 d2, Ni-resist austenitic cast iron is 50 o C to 70 o C above its melting point depend on casting thickness.
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