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 castings are brittle and are prone to pores during the casting process. Under long-term vibration and impact, stress concentration is likely to cause the shell to crack.

cast iron

Classification
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Description
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grey cast iron
Most or all of the carbon in the cast iron exists in the form of free-state flake graphite, and its fracture is dark gray, with certain mechanical properties and good cutting performance.
White cast iron
White cast iron is an iron-carbon alloy with no or almost no graphite in the structure. Its fracture surface is bright white, hard and brittle, and cannot be cut. It is rarely used directly in industry to make mechanical parts. Because of its high surface hardness and wear resistance, it is also called chilled cast iron or chilled cast iron
Hemp cast iron
Pitched cast iron is a kind of cast iron between white cast iron and gray cast iron. Its fracture is gray and white pitted. It has poor performance and is rarely used.
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Ordinary cast iron
Refers to cast iron that does not contain any alloying elements, such as gray cast iron, malleable cast iron, ductile cast iron, etc.
Alloy cast iron
It is a high-grade cast iron prepared by adding some alloying elements to ordinary cast iron to improve some special properties. Such as various cast irons with special properties of corrosion resistance, heat resistance and wear resistance
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Organizational performance score
Ordinary gray cast iron
Most or all of the carbon in this cast iron exists in the form of free-state flake graphite, and its fracture is dark gray, with certain mechanical properties and good machinability, and is widely used in industry
Inoculated cast iron
This is based on gray cast iron, using "modification treatment", also known as modified cast iron. Its strength, plasticity and toughness are much better than general gray cast iron, and its structure is more uniform. Mainly used to manufacture large castings with high mechanical performance requirements and large changes in cross-sectional dimensions
Malleable cast iron
Malleable cast iron is made of white cast iron with a certain composition after graphitization and annealing. It has higher toughness than gray cast iron and is also called ductile cast iron. It cannot be forged, it is often used to make castings that bear impact loads
Nodular cast iron
Referred to as ductile iron. It is obtained by adding a certain amount of spheroidizing agent and inking agent to the molten iron before casting to promote the crystallization of spherical graphite. Compared with steel, it has similar properties except for slightly lower plasticity and toughness. It is an excellent material with the advantages of steel and cast iron, and is widely used in mechanical engineering.
Special performance cast iron
This is a kind of cast iron with certain characteristics. According to different uses, it can be divided into wear-resistant cast iron, heat-resistant cast iron, and corrosion-resistant cast iron. Most of them belong to alloy cast iron, which is widely used in mechanical manufacturing
cast iron

Due to the poor weldability of cast iron and the high sealing requirements of hydraulic equipment, the traditional welding repair process cannot be repaired at all. However, there are generally no spare parts for such equipment on site, and a lot of downtime is required to purchase and replace.

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