Dongguan foundry introduces several classifications of cast iron

1. Gray cast iron. Introduction of Dongguan Precision Casting Factory. The carbon content is relatively high (2.7% to 4.0%). The carbon mainly exists in the form of flake graphite with a gray fracture surface, referred to as gray iron. Low melting point (1145～1250℃), small shrinkage during solidification, compressive strength and hardness close to carbon steel, and good shock absorption. It is used to manufacture structural parts such as machine bed, cylinder and box.

2. Dongguan cast iron white cast iron. The content of carbon and silicon is low, and the carbon mainly exists in the form of cementite, and the fracture is silvery white. Large shrinkage during solidification, easy to produce shrinkage holes and cracks. The hardness is high, the brittleness is big, can't bear the impact load. It is mostly used as blanks of malleable cast iron and making wear-resistant parts.

3.Dongguan Precision CastingMalleable cast iron. According to the Dongguan Foundry, it is obtained from white cast iron after annealing treatment. The graphite is distributed in clusters, referred to as tough iron. Its structural properties are uniform, wear-resistant, and have good plasticity and toughness. Used to manufacture parts with complex shapes and capable of withstanding strong dynamic loads.

4. Nodular cast iron. The gray cast iron molten iron is obtained after spheroidizing treatment, and the precipitated graphite is spherical, referred to as ductile iron. Compared with ordinary gray cast iron, it has higher strength, better toughness and plasticity. Used in the manufacture of internal combustion engines, auto parts and agricultural machinery, etc.

5. Vermicular graphite cast iron. The gray cast iron molten iron is obtained by vermicularizing treatment, and the precipitated graphite is in the form of vermicular. The mechanical properties are similar to those of nodular cast iron, and the casting properties are between gray cast iron and nodular cast iron. Used in the manufacture of automotive parts.

6. Alloy steel precision casting. Overview of Dongguan Cast Iron Factory, ordinary cast iron is obtained by adding appropriate amount 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, which has the corresponding characteristics of heat resistance, wear resistance, corrosion resistance, low temperature resistance or non-magnetic properties. Dongguan cast iron is used to manufacture parts and components of mines, chemical machinery, instruments, and meters.