Is the cast iron pot pig iron or wrought iron?

Pig iron is used for cast iron pots, and molten gray iron is used for green iron pots. The heat transfer is slow and uniform, but the pot ring is thick and rough and easy to crack. But if it is returned to the furnace at high temperature, it will not rust as long as it is washed and dried after use. The fine iron pot is wrought iron, which transfers heat evenly and is not easy to stick to the pot. The pot is also thinner, and the temperature in the pot can be higher. Smooth surface and easy to clean.