东莞市长安博扬金属材料有限公司

[Li Ting:][-][:]
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Ductile Iron
A general term for alloys mainly composed of iron, carbon and silicon. In these alloys, the carbon content exceeds the amount that can be retained in the austenite solid solution at the eutectic temperature. Cast iron is a general term for alloys mainly composed of iron, carbon and silicon. In these alloys, the carbon content exceeds the amount that can be retained in the austenite solid solution at the eutectic temperature.
Iron-carbon alloys with carbon content above. Industrial cast iron generally has a carbon content of ~. Carbon mostly exists in the form of graphite in cast iron, and sometimes in the form of cementite. In addition to carbon, cast iron also contains ~3% of silicon, as well as elements such as manganese, phosphorus, and sulfur. Alloy cast iron also contains elements such as nickel, chromium, molybdenum, aluminum, 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
① Gray cast iron. The carbon content is high (.~.), 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 (~℃), 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.
②White cast iron. The carbon and silicon content are low, carbon mainly exists in the form of cementite, and the fracture surface is silvery white. It shrinks greatly during solidification and is prone to shrinkage holes and cracks. It has high hardness and brittleness and cannot withstand impact loads. It is mostly used as a blank for malleable iron and to make wear-resistant parts.
③ Malleable cast iron. It is obtained after annealing treatment of white cast iron. The graphite is distributed in a floc-like form, referred to as tough iron. Its structural properties are uniform, wear-resistant, and has good plasticity and toughness. Used to manufacture parts with complex shapes that can withstand strong dynamic loads.
④ Ductile iron. Gray cast iron is obtained after spheroidizing the molten iron. The precipitated graphite is in the shape of spheroids, which is referred to as ductile iron. It has higher strength, better toughness and plasticity than ordinary gray cast iron. Used in the manufacture of internal combustion engines, auto parts, agricultural machinery, etc.
⑤Vermicular graphite cast iron. Gray cast iron is obtained after vermiformation treatment of molten iron, and the precipitated graphite is in the shape of worms. The mechanical properties are similar to ductile iron, and the casting performance is between gray cast iron and ductile iron. Parts used in manufacturing automobiles.
⑥Alloy cast iron. Ordinary cast iron is obtained by adding appropriate amounts of alloying elements (such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc.). Alloying elements change the matrix structure of cast iron, giving it corresponding properties such as heat resistance, wear resistance, corrosion resistance, low temperature resistance or non-magnetic properties. Used to manufacture parts for mining, chemical machinery, instruments, meters, etc.