Use a round hammer. All right. The iron pot is made of molten gray iron and cast by model, which has slow and uniform heat transfer, but the pot ring is thick, rough and easy to crack, so the density of the iron pot can be increased after manual hammering, making the iron pot more durable. Iron pot is a traditional kitchenware for cooking food. Generally, it does not contain toxic substances, but it will be oxidized when exposed to water for a long time. The main varieties of iron pots are printing pots, ear pots, flat pots, oil pots and pancake pots. The main component is iron, but also contains a small amount of sulfur, phosphorus, manganese, silicon, carbon and so on.