GI Steel Coil Supplier

  • Excellent Heat Insulation, Sound Proofing, and Water Resistant
  • Competitive Price
  • High Mechanical Strength
  • Strong Corrosion Resistant
  • Short Delivery Time 4-7 days

Your Reliable Partner and GI Steel Coil Manufacturer 

For constructing sturdy buildings and industrial equipment to handle heavy machinery, you need a metal that is not just strong but also reliable for longer periods of time. A GI Steel Coil by Sunnyda is the perfect choice for you because it resists heat, corrosion, and rusting thus increasing the life of the steel product you are investing in.

We ensure that you get the most updated product produced by our experts using innovative techniques. The idea is to create easy and quick solutions for your buildings and other steel applications. Sunnyda has a great team of expert engineers and experienced staff which comes with innovative ideas to bring the most reliable products for you. The formation of a GI Steel Coil requires a lot of research and accurate knowledge in order to produce the best results.

Sunnyda is of the view that quality equipment shall be the future of our buildings and industry and therefore, we never compromise on the quality. With many years of experience, Sunnyda has earned a good reputation in the GI Steel Coil market. While maintaining the quality, we manage to keep the price of GI Steel Coil affordable so that everyone can have the chance of using quality equipment.

Also, Sunnyda aims to provide premium quality, GI Steel Coil, with maximum enhanced features. It needs the least maintenance and has greater productivity due to its unique processing. You can get all your GI Steel Coil-related services and queries by contacting us. Our highly cooperative staff is available for your guidance at all times.

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GI Steel Coil-A Complete Buying Guide by Sunnyda.

Are you in search of sturdy material like a GI Steel Coil for your buildings and industrial applications? You can increase the lifespan of the steel used in your application by manifolds by coating it with a combination of metals.

When steel is coated with zinc, the coating prevents the underlying steel from oxidizing agents thus reducing rusting and corrosion.

This process of coating is called Galvanization and it results in the formation of GI Steel Coil. It not only enhances the physical properties but also increases the strength of the material.

A GI Steel Coil is not just harder but much more reliable than a regular coil. Therefore, it is recommended for applications that require sustained pressure and strength.

The characteristics, features, handling tips, and precautionary measures for a GI Steel Coil are explained in this article. So let’s start reading.


1.What is a GI Steel Coil?
2.What are the Features of GI Steel Coil?
3.What does GI Stand for in GI Steel Coil?
4.What are the Uses of GI Steel Coil?
5.What is the Manufacturing Process of a GI Steel Coil?
6.What is the Difference Between PPGI and a PPGL GI Steel Coil?
7.What is Meant by GI in Metal to make GI Steel Coil?
8.Is GI Steel Coil Better than Regular Steel?
9.What is Tensile Test in a GI Steel Coil?
10.What is Heat Treatment of GI Steel Coil?
11.What are the Purchasing Requirements of a GI Steel Coil?
12.What is the Necessary Certification for a GI Steel Coil?
13.How Hot Dip Galvanizing is done in GI Steel Coil?
14.How is GI Steel Coil Corrosion Resistant?
15.How to Paint your GI Steel Coil?
16.How to Handle your GI Steel Coil?
17.What are the Factors that Affect a GI Steel Coil and What is Malleability?
18.How to Prevent Black Discoloration of your GI Steel Coil?
19.How to Store your GI Steel Coil?
20.What are the Safety Precautions for your GI Steel Coil?


What is a GI Steel Coil?

A GI Steel Coil is a modified steel coil with enhanced abilities. The amplified features increase productivity and therefore result in greater output.

A GI Steel Coil can be cut into pieces and molded into wires to use for a wide range of applications.

It uses zinc in a bath to cover the surface with zinc particles, a rather stable element. Because of its better corrosion resistance and durability, it is preferred over non-galvanized steel coils.

It is different from galvalume steel coil because of its properties and composition. The former has only zinc whereas the latter uses a combination of three metals.

Along with innovation and efficiency, a GI Steel Coil comes with the highest quality for better performance.

For increased productivity in industries, high-grade steel is fabricated with zinc, to ensure greater resistance and strength.

It also offers better heat resistance and corrosion resistance. It has;

  • Hardness
  • Anti-corrosive
  • Long-lasting finish


What are the Features of GI Steel Coil?

The features of a GI Steel Coil are as follows;



It is harder than the regular stainless steel coils. This property is useful for applications such as building, automobile parts, machinery parts, and industrial equipment.


Corrosion Resistant

No matter what is the location of your application, a GI Steel Coil has the property to fight against corrosion. The powerful coating acts as a barrier between the stainless steel and the corrosive material.


Acid Resistant

No matter how strong the acid is, a GI Sheet Coil has a sturdy surface to fight against it. The strong bonding and tough properties of the combination of three metals play a role here.



It is far more durable than regular steel because it has the desirable properties of three metals combined. Therefore, it is used for hard applications and industrial equipment so that it can serve for years and there is no need for replacement.



A GI Steel Coil is more malleable than a regular steel coil because the combination allows it to be easily shaped into desirable shapes. You can turn it into coils or sheets depending upon your application. It can also be turned into wires.


What does GI Stand for in GI Steel Coil?

GI in GI Steel Coil stands for Galvanized Steel Coil.

It refers to the technique in which there is a coating of three metals zinc onto the metal surface to keep it protected against the external factors of the environment.

This coating is necessary for increased life span and better usability of the metal. Galvanization is better than non-galvanized Steel Coil because it has the following advantages;

  • Increased durability
  • Harder than normal metal
  • Better malleability
  • Improved corrosion resistance
  • Increased rust resistance.


What are the Uses of GI Steel Coil?

Following are the major applications of a GI Steel Coil;


Manufacturing and Refurbishing Applications

It is widely used in manufacturing and refurbishing industries to manufacture appliances and other devices. Due to its sturdy material, it is preferred for better quality and long-lasting products.


Outdoor Applications

As it is resistant to rusting, a GI Sheet Coil can prove to be a good material for all outdoor applications. It can be used for railing, doors, and devices that are kept outdoors.


Roofing System

A roofing system requires strong and resilient material to withstand pressure and all other external conditions. A GI Steel Coil is best for roofing because it has all the properties of strong material.

It can greatly resist harsh conditions like direct sunlight, water, rain, snow, acid, etc.



This application also requires a material that can work well against external environmental agents like moisture and heat. Water tends to rust a metal but by making it an alloy, the chances of rusting of metallic paneling are reduced.



As it is hard, a GI Steel Coil can be used in buildings. Whether it is the foundation of the window rims, it can serve the purpose well.


Industrial Applications

Industries require tough and strong parts to manufacture the required products. It requires a lot of weight-bearing and pressure application and therefore, a reliable material is required to be used in industries.


Agricultural Applications

Greenhouse pipes, chicken coop piggery, and granary also use a GI Steel Coil because they require a strong and sturdy material.


Other Applications

Other applications include exhaust pipes, mufflers, auto parts, frames, accessories, catalytic converter, signboards on the highway, and heat shields.


What is the Manufacturing Process of a GI Steel Coil?

Galvanization uses the same process as that of hot-dipped galvanized material. In order to get the best galvanization, the thickness should be kept at least 1mil. Also, the coating specifications may influence the thickness.

If the thickness of a hot-dipped galvanized steel coil is equal to that of a GI Steel Coil, the latter will last longer even if you put it directly in contact with external elements.

It has a better ability to interact with the environment and still sustains any damages. The corrosion and rust resisting properties work here.

  • First of all, the steel is run through an HR Slitter.
  • Then it is passed onto a pickling line.
  • The coil is then transferred to a cold rolling mill from where it goes to a CR trimming line.
  • The process is then continued to a continuous galvanizing line which further transfers it to a cut to length machine.
  • The next step involves a corrugation machine which results in a corrugated GI Steel Coil.


What is the Difference Between PPGI and a PPGL GI Steel Coil?

Though both the steel coils are covered steel coils the main difference between these is the coating.

The PPGI is the abbreviation of pre-painted galvanized steel coil whereas PPGL stands for pre-painted galvalume steel coil. The color coating on the steel can also be a reason for variety in the two forms.



PPGI variant has an evenly distributed coat of 100% zinc. There is no combination of any other metal in the coating material.

The value of the steel coil is increased due to a prolonged life span. It has a longer life due to anodic protection by zinc, which protects the base material, that is, steel.



It is a variant of a GI Steel Coil which is prepainted and then coated with a combination of metals. This coating is sacrificial and acts as a barrier for the metal underneath which is steel.

However, if there are any cuts or scratches, the surface will be more prone to corrosion due to the honeycomb structure of PPGL.

Also, if at all it does get corroded, the corrosion spreads on the surface thus covering more and more volume.

It has a smoother finish and has a very well-leveled surface which adds to the features.


What is Meant by GI in Metal to make GI Steel Coil?

GI refers to the term galvanization. Galvanization is a technique that refers to the sacrificial coating on metal to protect the inner metal from corrosion, rust, and other external factors.

Galvanization is preferred due to its increased durability and long-lasting effect. You can place it in harsh environments and direct contact with water and other oxidizing agents in the environment.


Is GI Steel Coil Better than Regular Steel?

GI Steel Coil is indeed better than a regular steel coil because it has the following advantages;


Longer Lifespan

It increases the life of the product on which it is used. Steel alone is not a very reliable metal and therefore it needs to be protected to stay in its best form. Galvanization helps to keep the inner steel safe so that the product can last longer.


Fights Against Direct Effect

The pure zinc coating is a powerful repellent of all external agents. Whether it is rain, snow, moisture, or humidity, your GI Steel Coil will remain sturdy. You can’t place a galvanized steel coil in water directly, but it can resist moisture.


Stays for Long

Being a stable metal, zinc has all the desirable properties to fight against external agents. Although zinc alone cannot fight the same situations as efficiently as the galvalume combination can, it is still a good option against non-galvanized.


What is Tensile Test in a GI Steel Coil?

It is done to test the strength and elongation of a material. It works by applying a tensile force to a material and then calculating the elongation produced in it. Tensile force is a pulling and stretching force.

A tensile test is known to be the most common test for checking the tensile strength of steel. In this test, a piece of the testing material has to undergo a strain rich is intended to fracture. The force to cause this fracture determines the tensile strength.

This test is also useful for the event and yield strength of the testing material. The reduction of area and ductility can also be assessed with the help of this test.

The specimen which has to be used for the test must have a certain thickness. Generally, full-thickness flat plate tensile test specimens should be selected for a GI Steel Coil or a steel wide plate.

When the thickness of the product is greater than 40 mm as in the case of bars and similar products, then round tensile test specimens should be used.

You can also use full section specimens with a given length. This is an alternative way that you can opt.


What is Heat Treatment of GI Steel Coil?

Heat treatment refers to using heat on a GI Steel Coil at various levels and stages. This is to change the state and physical properties of a material.

The microstructure of the metal changes to bring physical changes in the overall material. It is done by heating the material at a certain temperature, keeping it there for a calculated amount of time, and then cooling it back for desirable applications.

Via heat treatment, a metal can be molded into the required shape and so it can be stored and used accordingly.

A GI Steel Coil utilizes heat to obtain greater hardness and maximum strength and durability. The heat treatment can also help to reduce stress thus making it easier to weld or machine.


What are the Purchasing Requirements of a GI Steel Coil?

When you are purchasing your GI Steel Coil, make sure that it fulfills the following requirements;

  • It shall abide by the rules and regulations of ASTM.
  • There shall be no cracks in the coating so that there is a minimum chance of further damage and corrosion.
  • It shall be made sure that there is no perforation in the coating for at least 15 years.
  • The thickness of the coating must be greater than 150g/m2.
  • There shall be proper arrangements for the protection of your GI Steel Coil so that it lasts longer.
  • You should never compromise on the quality and always ask the manufacturer to give a proper indication of everything used in the making.
  • The chemicals that are utilized in the making of a GI Steel Coil shall also be pure and devoid of any contaminations.
  • The manufacturer must provide an elaborate manual listing the features, specifications, and uses of it so that you can make the best use out of your investment.


What is the Necessary Certification for a GI Steel Coil?

There must be at least three copies of all the certification and the consignment lists for the materials used in the process of making a GI Steel Coil.

Each type and grade shall have separate documentation. Following are the must include points in the documents;

  • Order number and purchaser number.
  • Steelmaking process.
  • Chemical composition of the coil.
  • Heat number and chemical composition.
  • Steel grade, brand, or type.
  • The number of items and quantities.
  • Specimen number if required.
  • Identifying marks for each product.
  • Size and indication of each GI Steel Coil.

The certificates shall also contain the results of all the tests run to ensure the quality and workability of the coil.

For example, resistance test to intercrystalline corrosion and ultrasonic tests results should be provided along with the procedure and other details

It should be stated that the materials used in the synthesis and processing are high quality and in accordance with the standard of GI rules for materials.

It shall be made sure that all the requirements and the quality checks were carried out to ensure the best quality.


How Hot Dip Galvanising is done in GI Steel Coil?

Hot Dip galvanizing is a technique that is used in both galvanized steel coil and GI Steel Coil. It is an electrochemical process that results in a better-protected metal.

In this process, a steel coil is run through a number of steps which are listed as follows;

  • It goes by coating non-oxidizing annealing furnaces on the steel coil. It is used as feedback material.
  • To remove any annealing furnaces, electrochemical cleaning is done. This step ensures that there is no contamination in the process.
  • Once it has been cleaned, it needs to be dried.
  • After drying it completely, the strip is annealed so that maximum mechanical properties can be obtained.
  • Then it is time to dip the material in the bath of a combination of three metals, that is, zinc, aluminum, and silicon. The percentage of these metals is also crucial.
  • These metals layer the surface of the steel coil and the thickness of this layering can be controlled.
  • The next step is to cool down the bathed steel coil and dry it so that it can be sent for further processing.
  • The finishing procedure includes steps like passivation, oiling, leveling, layering, and drying.
  • Now it’s time for coiling and the simple steel sheet is converted into a GI Steel Coil.
  • You can also use wet and dry faux for this procedure since it is just like hot-dip galvanizing.

The feedstock must have a certain set of mechanical properties. However, if it does not have annealing furnaces, it must be run through another procedure to make it suitable to be made into a GI Steel Coil.


How is GI Steel Coil Corrosion Resistant?

A GI Steel Coil is corrosion resistant due to a protective coating on the outside.

The protective coating has greater mechanical properties and can fight against external damaging agents such as rain, snow, ice, and acids, etc.

However, the outer metal coating is not resistant to alkalis and therefore tends to get damaged upon exposure to an alkaline material.


How to Paint your GI Steel Coil?

To paint your GI Steel Coil, make sure you take care of the following points;

  • Clean the surface before applying paint as dirt and any other foreign matter can lead to paint defects.
  • Make sure you degrease properly before applying paint so that you have a smooth surface to work on.
  • A GI Steel Coil is chemically treated to improve the adhesion of paint thus having a long-lasting effect.
  • Zinc coating reduces the adhesion properties of a few paints so you have to be careful about the selection of the paints.
  • You can improve the results by undercoating with a wash primer.


How to Handle your GI Steel Coil?

Following are a few instructions to handle your GI Steel Coil;

  • Use gloves while dealing with the coils as they have sharp edges which can cut your hands.
  • Paint defects can occur if there are scratches, oil stains, and abrasions due to poor handling.
  • You can hire some experienced workers to deal with your GI Steel Coil as it needs sufficient care.
  • Sometimes it is lubricated and has a low friction coefficient. It leads to slipping of sheets from your hands resulting in damage to the sheets and harm to the person handling it.
  • Repeated coiling, recoiling and uncoiling shall be avoided because it can lead to collapse.
  • Don’t collect them in piles as they can easily slide and cause chaos in the working area.


What are the Factors that Affect a GI Steel Coil and what is Malleability?

Following are a few factors that affect a GI Steel Coil directly;

  • Zinc thickness
  • Basic steel thickness of the coil
  • Packing

By paying due attention to these factors, you can obtain better productivity.

  • Malleability

Malleability is the property of a GI Steel Coil to be pressed, hammered, and rolled into sheets. Thus it can be converted into any desired shape without breaking.


How to Prevent Black Discoloration of your GI Steel Coil?

To prevent the black discoloration of your GI Steel Coil, there is no definite solution but you can try oiling.

It happens due to poor packaging and storing your GI Steel Coil in a high temperature and humid environment.

There is oxidation in a thin film near the surface of the external coating. Also, it tends to increase with time and it must be stopped so that the lifetime can be increased.


How to Store your GI Steel Coil?

To store your GI Steel Coil, make sure you follow all the instructions given below;

  • When you receive your GI Steel Coil, make sure that there is no moisture in the package. If there is any, dry it immediately.
  • Use a desiccator or take any other measures to keep the spaces in between the coils free of moisture. Also, take steps to prevent moisture from entering it.
  • Don’t store your GI Steel Coil in a hot damp place and instead go for a dry place. Storing it in a damp place will result in rusting or discoloration.
  • Also, keep a check that the packaging should remain intact and no moisture shall enter it.
  • Look for any abrasion marks and fix them as soon as possible. Also, try to fix the packaging if there is any breach in it.


What are the Safety Precautions for your GI Steel Coil?

Following are a few precautions that must be taken to ensure safe use of your GI Steel Coil;

  • The galvanized steel must not come in direct contact with a strong alkali.
  • Corrosion can be further reduced by preventing the accumulation of water on roofs made up of GI Steel Coil.
  • There should be no direct contact between the coil and the foundation concrete, steel, lead, graphite, and wet wood.
  • Make use of a trimmed plate rather than cutting the GI Steel Coil on the site.
  • The fingerprint-proof film shall be protected from discoloration due to dampness and high temperature.
  • This occurs frequently while piling and processing.
  • A small lot test is necessary for initial use so that there is no poor bonding in the case of bonding application and foaming.
  • Do not use ethanol to clean your GI Steel Coil.



Before you invest your money in purchasing a GI Steel Coil for building, industry, or any other application, you must be well aware of all the grades, stages, and features of it.

With the right precautionary measures and sufficient maintenance, you can increase the durability and lifespan of a steel coil by converting it into a GI Steel Coil.


FAQs of GI Steel Coil.

What is the Difference in Percentage of Composition of GI Steel Coil and GL Steel Coil?

A GI Steel Coil is composed of 100% zinc whereas GL Steel Coil is 50% aluminum, 50% of zinc, and very little silicon.


What is the Purpose of Manufacturing GI Steel Coil?

The purpose of manufacturing a GI Steel Coil is that it can prevent oxidation. The Steel inside the coating needs to be protected and therefore, the sacrificial coating undergoes all the damage.


What are other Metal Options Other than GI Steel Coil?

Some of the metals that can be equally useful as a GI Steel Coil are ferritic stainless steel, low alloy steels, cast iron, and martensitic stainless steel.


What are the Conditions where GI Steel Coil should not be used?

Alkaline environments are one of the exceptions where GI Steel Coil shall not be used. This is because aluminum does not go well with alkaline conditions.


How Denting and Scratching of a GI Steel Coil Effect the Efficiency?

If a GI Steel Coil is dented and scratched, it won’t be able to perform the best function. Therefore, it shall be used priorly, and also it must not be installed in the areas that are prone to damage.


What Kind of Alloy is a GI Steel Coil?

A GI Steel Coil is a compact quaternary crystal alloy. This physical property makes it ideal to be used in high-temperature areas where there is an extreme need for a coating to protect the steel.


What is the Temperature Limit for a GI Steel Coil to be used?

A GI Steel Coil can be used in temperatures as high as 315 degrees celsius. It can also be punched, welded, and sheared.


What is meant by the Thermal Resistance of a GI Steel Coil?

The thermal resistance of a GI Steel Coil refers to the maximum temperature it can endure. It normally works at 230 degrees and its color changes at 250 degrees celsius. However, the Temperature can go up to 315 degrees as well.


How to Define High Reflectivity in a GI Steel Coil?

The reflectivity of a GI Steel Coil is greater than 0.70 which is far more than the EPA Energy Star Standard. According to the EPA, 0.65 is also a good standard but 0.7 is ideal for construction and energy saving.


What Material is Recommended for Welding a GI Steel Coil?

Nickel Brass brazing material is recommended for high-temperature welding of your GI Steel Coil.


What is the Significance of Decreasing your GI Steel Coil?

Degreasing your GI Steel Coil is necessary to reduce paint defects. It can be done by spraying a neutral or a low alkaline material because strong alkali can damage the surface.


Why is it Important to Rinse a GI Steel Coil after Degreasing?

If sufficient rinsing is not done, water repulsion is seen on the surface of GI Steel Coil when sipped in water. A degreasing step makes the surface smooth and maintains a uniform water film.

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