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An Overview of Ductile Iron Manhole Covers

ductile manhole covers in India - Govind Steel

Depending on the application and requirements of an area, the accessibility and precision of ductile iron manhole covers are defined. However, one crosses by and witness a manhole cover everyday, no one pays attention to the details. The details as to how sturdy, long-lasting, and efficient they are for the required area of application. For the ones who know little about it, let us take a quick look at it.

What are Manhole Covers & why are they important?

Pretty much what the name suggests, Manhole Covers are removable iron, cast iron or ductile iron plates that essentially cover the opening of a manhole to prevent objects and people from falling into it. If you’re installing a new manhole cover or you’re replacing an existing one, measuring the space is key. Finding out the basics of a manhole cover is important to assure a perfect fit and zero-compromise with structural integrity.

What are the different types of Manhole Covers?

Ductile Iron Manhole Cover  

Strong, sturdy, resilient and heavy-duty, ductile iron manhole covers are used over a D400 class. The main purpose of using Ductile iron, also known as cast iron, is because of its strength. This type of manhole cover is used to add a long life span to any application. This kind is particularly used for installation in airports, docks, and other heavy-duty industrial areas.

Recessed Manhole Cover 

More like a holder or an outline structure, Recessed manhole covers essentially have a cut out in the tray so that bricks, paving bricks, cement, and other pavements can be installed. Since the cover is hardly visible, this allows the recessed manhole cover to blend in with the surroundings. It is useful for pedestrian walkways, side footpaths, etc. It’s also an excellent solution for internalized manhole covers. For example, hospitals, workshops, organisations, and societies.

Solid top Manhole Covers 

Places where safety and maintenance need to highlighted, Solid top manhole covers are used for those areas. The idea behind designing these covers is to highlight prominence on a specific floor or a certain area to keep people away from it. These are installed in the areas where one needs to highlight a certain architecture as opposed to hiding it. It is an anti-slip surface where the top is visible or even raised too. The starking contrast between the solid floors and the solid top manhole covers makes them easy to identify.

Where to find the best Ductile Iron Manhole Covers in Kolkata?

Govind Steel Company Limited is a 55-year-old Brand, making it one of the best foundries in India. We have a varied range of products like Ductile Iron Manhole Frames, Covers and Grates, Surface Boxes, Valve Boxes, Counter Weight, Industrial Castings, Manhole Frames and Recessed Covers, etc. For more information about foundries and to view our varied range of products, call us on +91 33 25309445, or leave us a mail on info@govindsteel.com and be rest assured to get a reply within 24 hours. You can even visit us at 219, Chittranjan Avenue, Kolkata – 700 006.

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Manhole Covers: History, Characteristics & More

There are many everyday objects that we come across and never wonder about. From something as simple as a comb while grooming ourselves in the morning to the manholes we cross over as we walk down the roads. Have you ever wondered what goes behind making the cover of a manhole? Manhole covers date back to the era of ancient Rome when they were made of stone.

Manhole covers, as we all know are the removable lids atop a manhole, usually big enough for a person to pass through. They are used to access underground pipelines and vaults. They started off as slabs of stones and sometimes, pieces of wood and this continued till the 18th Century. In the 19th Century, modern ductile manhole covers were developed. For the last 200 years, manhole covers are made of cast iron in varied designs.

While circular manhole covers are what we frequently come across, manhole covers are also available in different shapes like rectangle and square and varied sizes. There are also triangular manhole covers in some parts of the world. Here are some interesting characteristics of different types of manhole covers:

  • Choosing the right cover: When searching for the right manhole cover, many factors have to be considered. Construction, dimension specification, as well as the positioning of the manhole, have to be kept in mind while purchasing the manhole cover.
  • Division as per weight: Different manhole covers weigh differently, depending on the load they have to deal with. A manhole cover on an airport runway will have to be much heavier than a cover on the road, whereas one on a pavement which has only pedestrians and cyclists is lighter.
  • Locking of manhole covers: As an extra measure of security, manhole covers have the option of being locked up or welded, especially in case of manholes on roads where racing occurs. It may sound bizarre, but often manhole covers are stolen to be sold as metal scrap.
  • Difference between shapes: A round manhole cover is often chosen because the chances of it falling through its circular opening are very low whereas it is possible with square covers. They are much smoother, have smaller surface area, are easily movable as well as easy to lock in place.

Ductile manhole covers and manhole frames are invisible products that make our life smoother. Made of cast iron, they are sturdy and essential for the running of any city. Govind Steel, a leading foundry in India constructs varied types of manhole covers and frames as well as manhole grates. They have different shapes, sizes and designs along with other cast iron and steel products. To check out their vast range of products, visit http://www.govindsteel.com.

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All About Investment Casting – Process, Products & Benefits

We have read and learnt about the different types of metal castings in an iron foundry but this blog talks about the versatile form of casting – Investment Casting. Often known as ‘lost-wax’ casting, this process uses an expendable mould to create well-defined and fine surfaces. The precision and versatility of this process make it the number one choice for well-detailed cast objects. The moulds can be used to achieve the desired shape as it can be carved in wax and can be coated. Sure, this process tends to be a little more on the expensive spectrum but the end products can be complex and smooth as opposed to sand casting.

Common Investment Casting Products 

Operational pieces of precision machines are often made via Investment Casting. For example, the fans, camera and other engine parts with complex shapes that need mobility and fine surfaces are made via Investment Casting. It is commonly used for detailed jewellery, vintage and contemporary decor items.

The Investment Casting Process

The basic structure of an Investment Casting Process consists of an expendable pattern of wax mould: a ceramic mould material, and a kiln.

Expendable or Wax Pattern

This wax pattern is an exact replica of the final product one needs. It is filled in with an injection mould made of aluminum or steel. These moulds are usually machined, 3-D printed and hand-carved and owing to this, the process is more expensive than sand casting. Once the injection mold has been created, wax patterns are fast-tracked to allow the cast to solidify.

Pattern assemblies

The second step is to assemble these wax patterns and allow multiple items to be cast together in the tree formation (the casting system). Made from solid wax, tree-like channels are used to carry molten metal to the final product. To ensure efficiency, these structures should be assembled carefully.

Ceramic ‘investment’ mold

On assembling the tree structure, the whole thing is dipped in a ceramic bath and is let to dry, These baths are repeated several times to allow each coat to harden and create a thick mold. The tree is then heated to melt the wax and once removed, the mold is heated to a higher temperature and molten metal is poured inside. This process ceramics dipping and heating is the ‘investment’ of investment casting.

Mold removal

The entire process is let to cool down and once that happens, the ceramic mould is removed to unveil the finished product. Once done, if required, additional finishing or treatment procedures are done.

That is all about investment Casting. Find more about other casting processes and products on www.govindsteel.com. Govind Steel Company Limited is a 55-year-old company that has continually grown to become one of the largest and leading foundries for Grey Iron Castings and Ductile Iron Castings in India, with an installed capacity of 24, 000 MT. Contact Govind Steel today!

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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 – www.govindsteel.com

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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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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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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

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Everything You Should Know about Ductile Iron

If you’ve ever wondered what goes into building everything around you, you’ll know that metal is the answer. You might even be able to guess which metal but what about the details of each of these metals? When it comes to the nitty-gritty of these metals and which kind of iron, steel or alloy goes into which product, most of the people are clueless.

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