Difference Between Galvanized Coil and Flat Plate

February 25, 2021

How Galvanized Coil Differs from Flat Plate?

The modern world is rapidly developing and infrastructure plays a major role in every form of construction. Steel is one of those products which the builders and manufacturers use to bring strength and stability to their outputs. Galvanized coil and a flat plate of steel are two important industrial metals available in large quantities.

Different industries use these metals because they provide several benefits to them including cost-effectiveness, stability, and longer life, etc. These metals are even rust-free. In this article, we will compare these two metals and see how they differ from each other.

What is a Galvanized Coil?

Before we know what it is, let’s have a brief look at its background. Most of us may not know that a steel coil is an alloy of iron that possesses high physical and chemical properties. Galvanizing is the most effective and cost controlling technique for protection of raw steel from moisture and corrosive environment.

The most common method of galvanizing steel coil is hot-dip galvanizing. It is a process of applying a molten zinc coating to both sides of the bare steel coil at a high temperature to protect it from rust. Zinc acts as a shield between the external environment and the steel. When manufacturers apply it to the steel along with water and oxygen, the protection takes place. Zinc losses itself by preferentially corroding iron in steel, but protects the surface of steel effectively.

galvanized coil

The galvanized steel coil responds extremely well in both hot and cold temperatures as the basic steel substrate lasts long for many years.

What is a Flat Plate?

It is structural steel. We call it steel plate too. Its manufacture depends upon clients’ requirements. Large steel factories manufacture it in a variety of plates, bars, and slabs, etc. The manufacturers cut, weld it with an all-out yield of 50,000 PSI, and tailor it to develop a more intricate product.

The thickness of the steel plate could be 150mm or more, but in certain cases, it could be as low as 2mm. It has remarkable strength and formability. The plate is highly flexible and due to this characteristic, it offers numerous customization options to the users. Many of the plate’s applications are highly dependent on the nature of projects’ specifications. That means the flat steel plate is more suitable for specific tasks and not for general use.

Comparison between Galvanized Coil and Flat Plate:

Both forms of steel play a huge role in almost all aspects of life. There are numerous benefits of using them. However, they differ from each other in the precise meaning of the origin. Their cutting and packaging differ altogether. Given below are few distinctions of both the metal sheets that may give the reader an idea about their utility.


As stated above, the galvanized steel coil is a product of hot-dip galvanization. The ordinary steel dips in a pool of molten zinc to create a protective coating against rust and corrosion. On the contrary, the flat steel plate comprises multiple steel layers compressed together.

It is interesting to note that galvanized steel coil is relatively expensive than flat steel plate if both serve the same purpose and possess the same thickness.

Width and Thickness:

The width and thickness of the galvanized sheet are comparatively less than the flat steel plate. The difference occurs since applications of both the metal sheets address appropriately to specific tasks. Flat plate requires a wider range of width and thicknesses than other sheets since it serves the purpose strengthen super-structural frames. Examples include bridges in the oceans.


As compared to other steels, a galvanized steel coil is instantly ready for use. There is no need for further preparation of the surface and inspections, etc. However, it is interesting to note that in some cases, the cost of coil steel surpasses the cost of steel plate. It usually happens when both serve the same purpose with the same thickness.

Similarly, the induction of flat plates in beams speeds up the building process. Subsequently, the rapid construction lowers down the cost to economical.

Versatile Nature:

The flat plate earns its value in the field of adaptability. In addition to bracing and reinforcement quality, the metal withstands the harsh nature of the natural environment. Its adaptability characteristic addresses numerous issues that relate to the production process and self-life. Although its basic task is to provide strength to foundations, it also facilitates the construction of heavy material and non-workable parts.

The galvanized coil has huge applications in the wind and solar industries. Because of its corrosion-protective nature, it is hugely popular with environmental machinery that requires unstoppable workflow.

Likewise, the agricultural equipment is susceptible to rust and corrosion. The agricultural industry needs tougher and resilient equipment. The use of hot-dip galvanized steel coil in the equipment helps them withstand the tough environment of farming.


The galvanized steel coil is far more tensile than the flat steel plate. It possesses excellent weldability and paints adhesion nature. It is more intriguing and practical. That is why the signboards or billboard manufacturers opt for galvanized steel coil. The entire sheet appears beautiful and cleaner.

Durability and Strength:

The galvanized steel coil is considerably weaker than the flat steel plate. This is because it possesses an external layer of anti-corrosion coating which may wear out speedily than a flat steel plate.

The latter usually contains a mixture of chromium to protect the sheet from rust. Since the flat plate is extremely durable, the engineers explicitly employ it in the area of heavy machinery. It is primarily a natural choice where indestructible durability becomes the source of survival for the finished product. The durable nature of flat plate enhances self-life when applied to wearable components and parts of heavy machinery.


Both galvanized steel coil and flat plate possess a high level of stability. A galvanized steel coil may last long for over 5o years on average. Such a feature increases the reliability of the product employing it.


The galvanized coil is usually for smaller projects, such as house fittings, construction of steel frame buildings. You may find it in staircases, walkways, verandahs, fences, and balconies of houses. It is the ultimate choice of the automotive, agricultural, and telecommunication industries.

The carmakers use about 80% of galvanized steel coil because of its anti-rust capability. The zinc-coated bodies of automobiles have now become a culture in automotive manufacturing. Similarly, maintenance of telephone lines is hard work.

The galvanized steel application of phone lines reduces the risk of damage besides lowering their maintenance cost. Tubular and pipes manufacturers, electronic industries, aviation, and those who make canned foods need it. The galvanized steel coil has application in precision tools.

The flat plate is a structural steel that needs welding and cutting to make refined products. Its specific purpose is to provide the necessary strength to foundations that are capable of holding a huge amount of weight.

Since it is both corrosion and abrasion resilient, it serves a great reinforcement purpose in the world of heavy machinery. Examples are bulldozers and earthmovers. In addition to bridges, it has significant use in high rise buildings or skyscrapers, and huge storage tanks, etc. Reinforced beams speed up the construction process and the technique of using a flat plate on beams proves flexible and resourceful.


The amazing galvanized coil has immense applications in numerous industries due to its excellent anti-corrode property. The flat plate plays an equal role in strengthening the foundation of high-rise buildings and heavy structures.

The difference between the two originates from their make and composition. Both are extremely different from the application point of view although some of their features match including anti-rust and abrasion resiliency.

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galvanized coil

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