Zongli cast iron pot 18cm 1.2kg. According to relevant public information inquiries, cast iron pots refer to pots made of iron-carbon alloy with a carbon content of more than 2%. The carbon content of industrial cast iron is 2% to 4%. Carbon mostly exists in the form of graphite and cementite in cast iron. In addition to carbon, cast iron also contains 1% to 3% silicon, as well as phosphorus, sulfur and other elements. Alloy cast iron also contains elements such as nickel, chromium, molybdenum, copper, boron, and vanadium. Carbon and silicon are the main elements that affect the microstructure and properties of cast iron. Cast iron can be divided into gray cast iron. The carbon content is high (2.7% to 4.0%). The carbon mainly exists in the form of flake graphite, and the fracture surface is gray, referred to as gray iron. It has a low melting point (1145-125 degrees), small shrinkage during solidification, compressive strength and hardness close to carbon steel, and good shock absorption. Used to manufacture machine tool beds, cylinders, boxes and other structural parts. White cast iron. The carbon and silicon content are low, carbon mainly exists in the form of cementite, and the fracture surface is silvery white.