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Why choose ductile iron manhole cover over cast iron?

ductile iron manhole covers

When it comes to manhole covers, traditionally, they are made using cast iron. But over the years with the introduction of new and improved forms, ductile iron has proven itself as a great alternative. Many pieces of research later, it has been found that ductile iron is considered a better choice than cast iron because it can resist the same traffic loads with relatively lower self-weight and are less brittle than cast iron. Here is a list of its core strengths:

Bend It Like Ductile

Unbreakable yet bendable, ductile iron manhole covers are made from materials like carbon, silver, sulfur and magnesium. These materials tend to add strength and make it more durable in the longer run. But apart from lending to the superb quality, ductile iron manhole covers are easily bendable and have zero risks of breaking. This makes it a perfect choice as it contributes to structural agility.

Easily Compressible

The compressive strength of any metal contributes majorly to its choice of application. To further define, ductile iron has higher compressive strength as compared to any other form of metal. This form of metal can withstand any shape and any intensity of strength thus they prove to be better than cast iron.

Corrosion resistance and core strength

Manhole covers take the brunt of all-natural bodies like rain, sun, frost, and all its extremities. What works wonders, in this case, is the fresh coat of polish that can support the cause. Ductile iron, fortunately, is wear-resistant and corrosion-resistant and does not require the polish to function smoothly. Not only that, but the corrosion resistance also adds to the overall life of the manhole covers.

Low maintenance

Ductile iron, owing to all its properties, is extremely low maintenance and does not pose any harm to the safety hazards of the workers. Since they are easy to lift, low on weight and easy to clean, the pipe maintenance and other sewage conditions make it an ideal choice. It is way less brittle than cast iron thus is designed to be in the manhole frames and holds them perfectly.

To know more about ductile iron manhole covers, visit and read about their history, experience and the high-quality manhole covers provided by

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The Applications of Different Types of Cast & Ductile Iron

As a 55-year old cast iron foundry in Kolkata, we have researched and studied the glorious history of iron thoroughly. The transformation of iron from 3,000 years ago to today is revolutionary and the processes are beyond commendable. Centuries have been spent by the blacksmiths until the invention of the cast iron in the industrial age.

Ever since then, cast iron and ductile iron have evolved its new form while progressing in the terms of its composition, microstructure, and mechanical properties. While there are multiple applications for the modern-day iron made in the cast iron foundries, some of them are listed below:

Grey Iron Applications

Grey cast iron is a type of iron found in castings known for its grey color and appearance caused by graphite fractures in the material. It is mainly used to make cylinder heads, gas burners, enclosures, and housings because of the key characteristics of gray iron and its ability to resist wear and tear, especially when lubrication supply is limited.

Ductile Iron Applications

Owing to its multiple benefits, ductile iron is used to make heavy-duty gears, automotive and truck suspension components, hydraulic components, and automobile door hinges. The fact that ductile iron can be broken down into different grades, yields strength, and is wear-resistant, makes ductile iron, the prime choice. Its ductility makes it another great choice for great designs.

White Iron Applications

Mainly used for mixer paddles, liner plates for ball mills, augers and dies, coal chutes, and wire guides for drawing wires, White Iron is wear and abrasion-resistant. The process that is used to make white iron results in a brittle material that is very resistant to wear and abrasions.

Malleable Iron Applications

Through an annealing heat treatment, the brittle structure as the first cast is transformed into the malleable form. Malleable Iron is the iron that has the ability to retain and store lubricants, the non-abrasive wear particles, and the porous surface which traps other abrasive debris. Malleable iron is used for heavy-duty bearing surfaces, chains, sprockets, connecting rods, drive train and axle components, railroad rolling stock, and farm and construction machinery.

Compacted Graphite Iron Applications

As the name suggests, compacted graphite iron is famously used in commercial applications. Similar to ductile iron, compacted graphite iron is produced by adding magnesium to a desulfurized base iron. The combination of both the properties of creates a higher strength and thermal conductivity product.

To know more about the functioning of a cast iron foundry or the various applications of cast iron, contact and follow

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Choosing Between Ductile Iron And Traditional Cast Iron

Each casting foundry of India is known either for their Ductile Iron or the Traditional Cast Iron or both. While both the types are cast in the same foundry, their properties and varied and how. From applications to different resistance-levels, both the iron types play a pivotal role in the construction industry.Choosing a suitable kind for a particular job is extremely important and knowing the basics, tend to help. Below is a list of few basic differences between Ductile Iron and Traditional Cast Iron.

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