Pig Iron Ingot

Crude high-carbon iron straight from the blast furnace, fit only for remelting or converting to steel.

Pig Iron Ingot is what the Cast Iron Ingot Mold casts when pig iron, not cast iron, is poured into it: a standard ingot shape stacking to 16, rather than the freeform Pig a Sand Casting Bed freezes. It melts at 1150 C like any pig-iron item and recasts into itself, so nothing is lost carrying it as an ingot instead of a pig. Twenty Pig Iron Bits smelt back into one ingot; melting the ingot itself only ever recasts it into itself.