Indianapolis Gray and Ductile Iron Foundries 3823 Massachusetts Ave Interstate Castings is an iron foundry in Indianapolis. Indianapolis IN Gray and Ductile Iron Foundries Interstate Castings Inc www.iscastings.com interstate castings Indianapolis austempered ductile iron ADI ferrous ISO 9001 certified iron nodular iron short run industrial cast iron foundry castings ductile iron castings gray iron castings cast machinery replacement parts prototype castings s interstate castings Indianapolis austempered ductile iron ADI ferrous ISO 9001 certified iron nodular iron short run industrial cast iron foundry castings ductile iron castings gray iron castings cast machinery replacement parts prototype castings s Business Reviews Interstate Castings Inc Testimonials