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An Introduction to Grey Iron Castings

Iron castings are created using various melting methods and different methods lead to different types of cast iron like ductile iron, malleable iron or grey iron. Grey iron is a type of iron found in castings which is grey in colour because of the graphite fractures in the material. Grey iron is an alloy of iron and carbon and are typically made by smelting pig iron. Grey iron castings manufacturers claim that grey iron is popular due to its cost efficiency and ability to be made into complex structures.

Advantages of Grey Iron Castings

Grey iron is used for housings where the stiffness of the component is more important than its tensile strength, such as internal combustion engine cylinder blocks, pump housings, valve bodies, electrical boxes, and decorative castings. Grey cast iron’s high thermal conductivity and specific heat capacity are often exploited to make cast iron cookware and disc brake rotors. Grey iron casting also possess traces of phosphorous, sulfur, silicon and manganese in them. The advantages of grey iron casting are:

Heat-Resistant & High Carbon Content 

Grey iron casting is heat resistant, making them ideal for cast iron cookware and kitchenware and the high carbon content of grey iron castings makes it easier to melt, weld and machine the iron castings properly.


Grey iron casting is highly corrosion resistant as it can resist oxidization, which leads to the prevention of rust. This is one reason why they are used for housing purposes.

High Compressive Strength 

Grey iron casting can withstand high compressive force and have high compressive strength. For this reason, they are the prime choice for columns and posts in the construction of buildings.

High Damping Capacity 

Grey iron casting has a high damping capacity, about 20-25 times higher than steel and other iron types which reduces excessive wear & tear, vibrations and inaccuracies on machinery.

High Cost-Efficiency 

Grey iron casting is cost-efficient as they are produced economically in high volumes using an automatic production line or disamatic equipment.

These castings are a popular choice owing to its high thermal conductivity and low cost. There are many foundries that produce grey iron casting all over India. Govind Steel is a 55-year-old company that has become one of the leading grey iron casting manufacturers in Kolkata. The foundry has received numerous awards from the Government of India for its excellence in the export of castings. To know more about our products, visit