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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 castings are 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 castings also possess traces of phosphorous, sulfur, silicon and manganese in them. The advantages of grey iron castings are:

Heat-Resistant & High Carbon Content 

Grey iron castings are heat resistant, making it 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 castings are highly corrosion resistant as they 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 castings can withstand high compressive force and have high compressive strength. For this reason, they are the prime choice for columns and posts in construction of buildings.

High Damping Capacity 

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

Grey irons castings are a popular choice owing to its high thermal conductivity and low cost. There are many foundries that produce grey iron castings all over India. Govind Steel is a 55-year-old company that has become one of the leading grey iron castings 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