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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 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

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The World of Expendable and Permanent Moulds in Iron Casting

The true pioneers of Industrial Development and the improving standard of living are the foundries – Metal, Iron or Ductile Iron Foundries across the nation. But do we really understand the actual functioning of the same?
Let us debunk this alien concept by understanding the basics of metal castings and different moulds used.

The process where the molten metal is poured into the mould containing a hollow cavity to get any geometrical shape one wants is casting. This process can be further can be divided into two types – Expendable or Semi-permanent Mould and Permanent Mould. Let us find out what are their functions:

Permanent moulds are made of metal with a high melting point over the metal that needs to be cast. The main purpose of using these permanent cores is because they are simple to use and can be reused. Such moulds are generally used for both low-temperature alloys and iron. The castings from this method have thin walls as they are produced with “close tolerance”. Castings made this way are fine-grained and dense with a smoother surface finish. A few common types of permanent castings are:

  • Low-pressure Casting
  • Gravity Casting
  • Die Casting

Semi-permanent moulds are the ones where the cores are expendable and can result in more complex shapes. Usually, sand, plaster and ceramic is used as the core as it allows the possibility of being taken out or broken down to get the casting out. Such moulds are generally bound with a bonding agent that improves its properties and creates complex, intricate castings. A few of the examples are:

  • Sand Casting
  • Plaster Moulding
  • Shell Moulding
  • Ceramic Moulding
  • Investment Casting

Among the foundries in Kolkata famous as industrial casting manufacturers, Govind Steel is one of them. Govind Steel is one of the largest and leading foundries for Grey Iron Castings and Ductile Iron Castings in India. To know more about the same, kindly visit –

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All About Metal Castings – The process, different types and more

In the history of industrial manufacturing techniques, casting is the oldest one. However, modern advancements in technology have led to a host of casting methods and techniques. But before we get into that, here is what casting actually is. It is a process that allows molten metal to be poured in a specially designed mold to take various shapes Read more

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The Types of Iron Cast in a Foundry

While we are well-versed with the role of iron in the industrial sector, what’s often confusing is the different types of iron and iron alloys – cast iron, ductile iron, and wrought iron to begin with. It all begins with a metallurgist listing down his requirements – mostly mechanical and then an alloy is suggested. Followed by the above, Read more