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Galvanized Steel Sheet

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Your Professional Galvanized Steel Sheet Supplier

Hormann (Jinan) Metal Co., Ltd. was a company specializing in the professional production of various specifications and models of steel, research and development, design, production, sales, and service. Our products include galvanized steel, seamless steel pipe, stainless steel, aluminum alloy, copper alloy, black iron sheet, stainless rebar, and prepainted steel coil.

 

Why Choose Us
 

Wide Range of Applications
Our products are used in the construction industry, automotive industry, shipbuilding industry, chemical industry, metallurgical industry, aerospace industry, etc.

 

Broad Market

Our products are sold to the global market, mainly in the Middle Eastern countries, North America, Australia, and other regions, and have won unanimous praise.

 

Professional Advanced Equipment
We have a series of equipment specializing in the production of steel, including steel plate pretreatment equipment, steel plate leveling equipment, cutting machines, cold processing equipment, assembly equipment, welding equipment, correction equipment, painting equipment, lifting equipment, transportation equipment.

 

Leading Service
Professional engineers can provide consultation on sprocket expertise and professional advice on product selection, design, installation, and maintenance.

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Definition of Galvanized Steel Sheet

Galvanization is a manufacturing process involving the application of zinc coating to steel to prevent it from rusting. The zinc coating works to protect the base metal. It does this by acting as a barrier to the various corrosive elements. Galvanized sheet metal is one of the most popular types of steel. This is due to its increased strength, extended durability, and formability. The corrosion-resistant property throws its usefulness up a significant notch.

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What are Advantages of Galvanized Steel Sheet
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Durable
The galvanized coating offers one of the most durable corrosion protection in the industry. With an average zinc coating of 85 microns, you can protect your steel structure for the good part of a century. This coating thickness also meets the required corrosion performance in various applications in the world today.

Reliable Coating
The coating formed on the steel is consistent and specified. All thanks to the relatively closely controlled galvanization process. Galvanized steel offers the most reliable protection from corrosion for several reasons. First, the natural metallurgical reaction makes the process replicable. Unlike paint coatings, the bond formed through galvanization forms a part of the steel itself. The resultant galvanized coating offers due protection to the steel for a long time.

Cost-Effective
When considering the true cost of steel protection, some factors are put into consideration. Two of the major factors include the initial cost and the lifetime cost of protection. Galvanization offers a high-performance coating such that you won’t need to paint your steel for a very long time. While galvanization costs remain constant, we have seen an increase in painting costs over the years. The initial cost of galvanized sheet metal is often low, and the steel is ready to use immediately after delivery.

Fast Turnaround
With the right company, you can get steel galvanized within a very short period. The steel galvanization process is not time-consuming. Once the prepared steelwork is ready, the job should be done within 24 hours. Although the preparation must be thorough, it need not take too much time. The process itself is straightforward and relatively immediate. Processing of orders at the galvanizing plat may push the turnaround to about three days.

Complete Coverage
The bond formed between steel and steel during galvanization is very strong. This coating usually lasts for generations. Alongside the increased strength of the steel material, there is also superior coverage.
This ensures that the structures of the galvanized sheet metal remain protected, even when they are most vulnerable.

 

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Excellent Protection
The zinc coating on galvanized steel provides an excellent protective barrier. It shields the underlying steel from rust, oxidation, and other forms of corrosion. Galvanized steel is particularly suitable for applications where long-term protection against corrosion is critical, such as construction, infrastructure, and outdoor equipment.

Self-Healing
Galvanized steel possesses a unique self-healing property. If the zinc coating is scratched or damaged, it forms a protective layer of zinc oxide and zinc carbonate over the exposed area, effectively sealing it from further corrosion. This self-healing mechanism helps maintain the integrity of the steel and prolongs its lifespan. Owing to this zinc-oxide magic, Galvanized steel presents itself as a reliable, long-lasting solution in various applications demanding superior corrosion resistance.

Cost-Effective
Galvanized steel offers cost-effectiveness in terms of both initial investment and long-term maintenance. The extended lifespan and corrosion resistance of galvanized steel reduces the need for frequent repairs, replacements, and associated costs. It provides a reliable and economical solution for various applications.

Durability

Galvanised steel is known for its exceptional durability. The zinc coating provides a robust barrier against moisture, chemicals, and atmospheric elements, making galvanized steel resistant to damage and wear. It can withstand exposure to harsh conditions, including outdoor environments, without significantly degrading.

Easy Maintenance

Galvanized steel requires minimal maintenance throughout its service life. It does not need frequent repainting or recoating to maintain its corrosion resistance. The zinc coating provides long-lasting protection, reducing the need for regular maintenance, touch-ups, or replacement.

Versatility

Galvanized steel is highly versatile and can be fabricated, formed, or welded to meet specific requirements. This versatility makes galvanized steel suitable for a wide range of applications, including construction, automotive, agricultural, and manufacturing industries.

Aesthetic Appeal

Galvanized steel can have an attractive, shiny appearance, particularly when it is newly galvanized. Over time, the zinc coating develops a characteristic dull grey patina, which is often desired in architectural and industrial applications for its distinct aesthetic appeal.

 

Common Types of Galvanized Steel Sheet
 

Hot-Dip Galvanized Steel Sheet
Immerse the sheet steel into the molten zinc bath to make its surface adhere to the zinc sheet steel.
At present, it is also basically produced by a continuous galvanizing process, which can continuously dip the rolled steel plate into the molten zinc plating bath to make galvanized steel plate;

 

Alloyed Galvanized Steel Sheet
Moreover, this kind of steel plate is basically manufactured by a hot dip method, but it can be heated to about 500 ℃ immediately after it is out of the tank, which is also an alloy coating that can make it produce zinc and iron.
This kind of galvanized sheet also has very good coating adhesion and weldability;

 

Electrogalvanized Steel Sheet
The galvanized steel plate is mainly manufactured by electroplating method, which basically has a particularly good processing performance.
However, the coating is relatively thin and its corrosion resistance is not as good as that of hot-dip galvanized sheet;

 

Single-Sided Galvanized Steel Plate and Double-Sided Differential Galvanized Steel Plate
Single-sided galvanized steel plate, that is, products that are galvanized on one side only.
It has better adaptability than double-sided galvanized sheet in welding, coating, anti-rust treatment, processing, etc.
In order to overcome the shortcoming of single side without zinc coating, there is another kind of galvanized sheet coated with thin layer of zinc on the other side, that is, double-sided differential galvanized sheet;

 

Alloy and Composite Galvanized Steel Plate
It mainly uses zinc and other metals such as lead and zinc to make alloy and even composite plating steel plate.
This kind of steel plate not only has excellent anti-rust performance, but also has good coating performance.

 

Applications of Galvanized Steel Sheet

 

1.Wind And Solar Industries
Wind and Solar Industries are sectors where continuous workflow is needed. The use of galvanized steel sheets allows the industries to operate in a similar fashion. The steel sheets don’t require maintenance for decades as this steel sheet type is extremely durable.

2.Agriculture Industry
The agriculture industry is yet another sector where galvanized steel sheet is used highly. The field requires tools and materials to be highly resilient and resistant to corrosion and oxidation. Galvanized Steel sheets have qualities that are ideal for fulfilling these needs.

 
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Automotive Industry

It is quite a common thing to use galvanized steel sheets in the automotive industry, especially in the manufacturing of automobiles. Cars, buses, and so on have galvanized steel sheets used on the outer surfaces, which are more prone to corrosion and rust due to various factors.

 
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Construction Industry

In the construction industry, galvanized steel sheet is used not just for the purpose of strength and longevity, but also for aesthetics. The shiny finish of the galvanized steel sheets adds that modern architectural zing to the structures erected by the construction industry.

 
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Telecommunication Industry

The Telecommunication Industry uses a lot of tools, equipment, and devices, like telephone lines, boxes, towers, and so on, that are generally kept out in the open, and it is required for them to function for years without regular maintenance. Galvanized steel sheets allow for the continuous use of these resources.

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Process of Galvanized Steel Sheet
 

Surface Preparation

The steel to be galvanized is first thoroughly cleaned to remove any dirt, rust, or contaminants. This is typically done by immersing the steel in a degreasing bath or using chemical cleaning agents. The goal is to ensure a clean and smooth surface for proper adhesion of the zinc coating.

 

Acid Pickling

After the initial cleaning, the steel is immersed in an acid solution, usually a diluted mixture of hydrochloric acid and sulfuric acid. This step, known as acid pickling, removes any remaining mill scale, rust, or oxides from the steel's surface. It also helps to etch the surface, creating a rough texture that improves the bond between the steel and the zinc coating.

 

Fluxing

Once the steel has been pickled, it undergoes fluxing. Flux is a chemical compound, often a mixture of zinc ammonium chloride and other additives, which is applied to the steel's surface. Fluxing helps to remove any remaining oxides, promotes the flow of the zinc coating, and prepares the surface for galvanization.

 

Galvanisation

The steel is now ready for galvanization. It is immersed in a bath of molten zinc, typically heated to a temperature between 815°C and 850°C (1500°F and 1560°F). The zinc bath may contain additional alloying elements, such as aluminum, to enhance the coating's properties. As the steel is immersed in the bath, the molten zinc reacts with the iron in the steel, forming a metallurgical bond. The zinc coating covers the entire surface of the steel, providing a protective layer.

 

Removal and Cooling

After the steel has been thoroughly coated with zinc, it is slowly withdrawn from the zinc bath to allow excess zinc to drain off. The steel is then cooled, either by air or by quenching in water. This solidifies the zinc coating and ensures it adheres firmly to the steel surface.

 

Inspection and Quality Control

Once the galvanization process is complete, the galvanized steel is inspected for any imperfections, such as bare spots or rough areas. Various quality control tests, including coating thickness measurement, visual inspection, and adherence to relevant standards, are conducted to ensure the final product meets the required specifications.

 

Considerations When Using Galvanized Steel Sheet

 

Proper Storage and Transportation
During transportation and storage, galvanized steel should be handled with care to avoid breakage, scratches, or surface damage. In particular, avoid contact with chemicals and strong mechanical impacts that can damage the zinc coating and reduce the corrosion resistance of the steel.

Product Quality Check
Before use, thoroughly inspect the galvanized steel to ensure its technical properties and durability. Check the surface of the steel for any defects, scratches, or abnormalities. If any issues are found, promptly inform the supplier or manufacturer to receive support and address the issue.

Proper Installation and Connections
When installing galvanized steel, use proper installation methods and ensure that the connections, screws, and fasteners used are made of materials compatible with galvanized steel. Using stainless steel screws and accessories will reduce the risk of electrochemical corrosion and corrosion.

Follow Standards and Guidelines
Adhere to the technical standards and guidelines provided by the manufacturer or relevant government agencies when using galvanized steel. These guidelines include regulations on thickness, installation methods, preservation, and maintenance of the product.

Regular Maintenance
To maintain the corrosion resistance and lifespan of galvanized steel, perform regular maintenance. This includes checking and cleaning the galvanized steel surface, repainting scratched areas, and replacing damaged or aged parts.

Prevent Electrochemical Interaction
When using galvanized steel alongside other metals, avoid direct contact between different metals, especially when they are wet or in a moist environment. Electrochemical interaction between different metals can cause corrosion and damage the zinc coating.

Customize Warranty Policies
If you plan to use galvanized steel in special applications or have specific requirements, customize the warranty policies with the supplier or manufacturer. This ensures that the product meets your specific requirements and quality.
By paying attention to and following the requirements and advice above, you can effectively and durably use galvanized steel, ensuring its corrosion resistance and durability over time.

 

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Our professional quality inspectors will conduct a quality inspection on each batch of products. Furthermore, authoritative test reports are also available.

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Customers can choose any length or other requirements, order or purchase various steel products or request special specifications.
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For the sold materials, we are responsible for the overall quality tracking, in order for you to eliminate worries.

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Frequently Asked Questions
 

Q: How Does Galvanization Offer Protection of Base Metal?

A: The basic principle of galvanization is to permanently bind the steel and zinc together to give a more rust-resistant version of the base metal. There are various types of galvanization, each of them having its unique principles.
However, galvanization generally works on the following principles:
  • The zinc coating works to prevent corrosive substances such as acid from reaching the base metal.
  • Zinc sacrifices its anode more readily than the base metal when the coating is scratched. Therefore, it offers complete protection from rusting.
  • Zinc corrodes faster than the base metal. This activity is a great way of protecting the base metal. Since the aim is to allow zinc rust before the metal for adequate protection, chromate can be added.
  • However, an effective galvanization process depends greatly on pretreatment and post-treatment. An inefficient pretreatment will not allow the molten zinc to react with the steel for a perfect galvanized film fully. Furthermore, an inefficient post-treatment process will compromise the appearance of the galvanized film. Thus, leading to a reduced value of components.

Q: What are the processes of Galvanized Steel Sheet?

A: ●Hot-Dip Galvanization
Hot-dip galvanization is the most widely used method of galvanization. Just as its name suggests, it involves the dipping of the steel in molten zinc. The pool of molten zinc often maintains a temperature of about 860°F (460 °C). After proper cleaning of the base metal chemically, it gets fluxed to eliminate residual oxides.
A metallurgical bond begins to form between the zinc and the intended metal. After pulling the metal from the bath, the pure zinc mixes with oxygen from the atmosphere to form zinc oxide. Then, the zinc oxide reacts with carbon dioxide to form zinc carbonate. The zinc carbonate makes the final coating on the base metal. Usually, you’ll find a crystalline-like pattern on the surface of galvanized metal made by this method. It is a simple and economical choice.
●Electro Galvanization
Unlike the hot-dip method, this type does not use a molten zinc bath. Rather, it uses an electrical current in an electrolyte solution to transfer the zinc ions into the metal.
The positively charged zinc ions are reduced electrically and deposited on the charged material. It offers the benefit of precise and uniform coating thickness.
●Galvannealing
Galvannealing combines the hot-dip galvanization process with the annealing process. This method produces galvanized steel with some specialized coating.
The hot dipping and annealing occur instantaneously. Therefore, you look forward to producing a matte gray finish. This method produces galvanized sheet metal that is can withstand welding and conducive to paint adhesion.
●Pre-Galvanization
This method is quite similar to hot-dip galvanizing. However, it gets performed at a steel mill on materials with specific shapes. It involves rolling the metal sheet through a cleaning agent. This helps it to prime the material for galvanization quickly.
The metalworker passes the base metal through a pool of molten zinc, after which recoiling takes place. It enables the rapid galvanization of coils of steel on a large scale.

Q: What real-life industry applications does Galvanized Steel Sheet have?

A: There are countless applications of galvanized sheet metal, helping to make components of both large and small machines. When it comes to sheet metal work, galvanized steel helps in manufacturing components that can withstand harsh conditions.
These components tend to remain true to their quality, regardless of the level of strain they go through. Some of the most common applications of galvanized sheet metal are in:
  • Automotive Industry
The use of galvanized steel on vehicles dates many years back. Using zinc-coated bodies on automobiles has become the norm of car manufacturing. The rust-resistant nature of this material makes it a great marketing tool in the competitive market. Several makers leverage them to offer anti-rust warranties to their customers.
  • Telecommunication Industry
Maintaining phone lines isn’t an easy job. They require the toughest and most reliable materials for success. Galvanized sheet metal offers its use on phone wiring and equipment boxes. Therefore, there will be decreased danger of injury and reduced maintenance costs.
  • Electric Equipment and Appliances
When you look at most electric appliances around you, you may be able to notice the unique features of their casing. Most casings for electrical equipment use galvanized steel material. In fact, it is not surprising that some interior parts of these appliances are made from this steel material.
  • Building and Construction Industry
The sturdiness and durability that galvanized sheet metal offers make it popular in the construction industry. It has been employed in various commercial and residential projects to the highest level.
The kind of ‘shine’ provided by this material also makes it a great choice for aesthetics. Therefore, it provides constructors with modern architectural designs. It is an excellent material for both large structural pieces and smaller construction works.

Q: Can You Paint Galvanized Steel?

A: Usually, paints do not adhere the best on galvanized sheet metal. The layer of zinc often rejects paint. However, you can paint galvanized sheet metal with the right tools and method. First, you must remove every dirt buildup in the steel. Then, wiping the galvanized surface with white vinegar will help to promote paint adhesion.

Q: Can You Weld Galvanized Steel?

A: Yes. Welding galvanized steel is a valuable technique in sheet metal fabrication technique. Having the best understanding of the welding process will give a satisfactory output. This helps to make galvanized sheet metal gratings or wire cloths.

Q: What are the important features of Galvanized Steel Sheet?

A: Before being coated in hot molten zinc, or being painted, sprayed, or electroplated, steel sheets are first cleaned in a degreasing solution. After this, it is immersed and allowed to rest in a container of hot dilute sulphuric acid. The steel is then cleaned with an aqueous solution of zinc, ammonium, and chloride. All these steps ensure that the steel doesn’t get contaminated in the long run and that the coat of zinc properly sticks to it. Even after the galvanization process, the end product is thoroughly checked for gaps or inconsistencies.
Galvanized steel sheet is resistant to rust and corrosion which makes it an ideal kind of steel sheet to be used in areas where there is a really high chance of oxidation or rust. It is also quite an affordable steel sheet type to be used, mainly because of its low manufacturing cost in comparison to other steel sheets, and also because it can be used directly, i.e. without any further preparation or treatment. Quite like the other galvanized steel products, galvanized steel sheets last for years and years to come, which makes it quite a beneficial steel sheet.

Q: What are the common grades of Galvanized Steel Sheet?

A: Thanks to the overwhelming qualities of galvanized steel sheets, they are used in numerous sectors. They are specifically used in areas where you can anticipate higher chances of oxidation and corrosion. Now, depending on the galvanization process, and the overall quality of the galvanized steel sheets, they are divided into numerous grades. Depending on your need, you could choose the right galvanized steel sheet grade. A few of the optimum grades of galvanized steel sheets include A 446-76, SGC 340, and SGC 400. All of these are structural steel-grade galvanized steel sheets.

Q: What are some uses for Galvanized Steel Sheet in the kitchen?

A: In addition to the different commercial and industrial sectors, there are so many ingenious ways to use galvanized steel sheets in the kitchen. When galvanized steel sheets are used in the kitchen, they don’t just last for a very long time, but also add an aesthetic appeal to the kitchen. Galvanized steel sheets are more affordable options in comparison to other materials. One of the most effective uses of galvanized steel sheets is on the walls and ceilings.
It adds an impactful pattern, texture, and finish to the kitchen altogether. Yet another interesting way to use galvanized steel sheets in the kitchen is to use them as fixtures. The material can be used on countertops and bars. The doors and windows on the cabinets could also make use of galvanized steel. Generally, these areas in the kitchen are prone to water splashes or moisture in the air, which causes degradation in the long run. The use of steel as a protective layer on their surfaces ensures overall protection and longevity. The one thing that you should keep in mind is to not overdo it. You would want your kitchen to look like a kitchen and not a metal box.

Q: What are the advantages of Galvanized Steel Sheet?

A: Galvanized steel is stronger, more durable, and better effective against corrosion and oxidation than regular steel thanks to the protective layer of zinc that covers it. Depending upon its application, the thickness of the coating layer, and the overall quality, galvanized steel can serve the users for years. The extra layer of zinc also prevents the steel from getting contaminated, which is the second major way how the alloy could develop rust.
While dipping the steel in hot molten zinc is more advantageous, sheet galvanizing, spraying on the zinc, painting or electroplating can result in galvanized steel that is more disadvantageous. Galvanized steel produced in that way is prone to chipping, cracking, or other forms of degradation.
Depending on where the galvanized steel is used, it could get scratches, and often, the layer of zinc itself could come off, which could leave the specific area exposed and prone to rustication. Whether you’re using steel that is designed to resist rust by following any other method, or you’re looking to use galvanized steel sheets, you need to keep the benefits and disadvantages of these materials in mind before going for them.

Q: How Can We Achieve Galvanized Sheet Metal?

A: Hot-Dip Galvanizing
  • This is the most popular sheet metal technique for galvanization. The process submerges metal parts in a bath of molten zinc to protect the metal and occurs in three different ways:
  • The zinc coating, when intact, prevents corrosive substances from reaching the underlying steel or iron.
  • It acts as a sacrificial anode, which is the main component of a galvanic cathodic protection (CP) system used to protect buried or submerged metal from corrosion. This means that if the coating is scratched, the exposed steel or iron will be protected by the remaining zinc.
  • The zinc protects its base metal by corroding before iron.
  • Hot-dip galvanizing limits a steel or iron product’s exposure to the natural elements, protecting it from corrosion and oxidation. Hot-dip galvanizing has been specified to combat steel corrosion for more than 100 years; however, the specification and use of galvanized steel evolves constantly as new markets emerge. Though corrosion resistance is inherent any time hot-dip galvanizing is utilized, there are a number of other benefits including low initial and life-cycle costs, durability, longevity, availability, versatility, sustainability, and aesthetics that lead to the specification of galvanized steel. This sheet metal technique is also economical, can be performed within minutes, and covers hard-to-reach areas of complex product shapes.
Electrogalvanizing
  • This process is when a layer of zinc is bonded to stainless steel using electroplating, which is when a fabricator runs a current of electricity through a saline-and-zinc solution with a zinc anode (an electrode through which conventional current flows into a polarized electrical device).
  • In electrogalvanizing, the polarized electrical device is a steel conductor.
  • Compared to hot-dip galvanizing, this sheet metal technique offers lower thickness deposits for comparable to increased performance, a broader conversion coating availability for color options, and brighter deposits.
Metallic/thermal spraying
  • Metallic spraying is the process of covering a sheet metal product with a metallic coating using a spray of molten particles.
  • The molten metal is then atomized into small particles and sprayed outward onto a surface.
  • The molten particles [don’t] heat the surface because the heat of a particle is proportional to its size. On contact, the particle flattens out and adheres to the surface as it hardens.”
  • Flame and arc spraying are sub-methods of this technique, adding anti-corrosion layers and thermal barriers. Other benefits of metallic/thermal spraying include increased durability, wear resistance, modified electrical properties, and additional protection to damaged materials.
Sherardizing 
  • Sherardizing is also known as vapor or dry galvanization.
  • It involves heating steel products up to 932 degrees Fahrenheit in a closed rotating drum that contains metallic zinc dust and potentially an inert filler, such as sand.
  • At temperatures above 572 degrees Fahrenheit, the zinc dust evaporates and diffuses into the steel substrate forming a diffusion bond.
  • This method is ideal for small sheet metal parts and parts that require coating of inner surfaces, as the product must be smaller than the rotating drum.
  • A huge benefit to this sheet metal technique is that no hydrogen is involved. Therefore, hydrogen embrittlement (when steel becomes brittle due to the introduction and subsequent diffusion of hydrogen into the metal) is excluded.

Q: What Are The Benefits Of Galvanized Sheet Metal?

A: Galvanized sheet metal is one of the most requested products from fabrication shops around the world.
The most common industries are utility, agriculture, construction, bridge and highway, and recreation. These industries require a variety of sheet metal products, including “structurals, fasteners, tubing, pipe, wire, nails, reinforcing steel, weldments, complex fabrications, guardrail, and posts.”
If so many companies want galvanized sheet metal, what’s the big deal? Here are the benefits of this sheet metal product:
  • Galvanization costs less. When it comes to protective coatings for stainless steel, galvanization is one of the least expensive options because it’s not as labor-intensive for a sheet metal fabrication shop. Even if the initial cost of galvanizing is quoted as more expensive than other protective coatings, this sheet metal technique is the best option for most contractor budgets because of its long-term investment. Unlike other options, galvanized sheet metal in structural members lasts about 50 years in rural environments and 20 to 25 years in severe urban and coastal exposure. Even with a long life expectancy, it requires little to no maintenance, repairs, and/or replacements.
  • No time is lost. Part of being a contractor is ensuring that a project remains on schedule and within budget. Galvanized steel allows you to do just that, because galvanized coatings are easily examined by eye, and non-destructive thickness testing methods are used. No time is lost in excessive testing. After examination, skip surface preparation, painting, or further inspection because galvanized structures are ready to go after direct assembly. Even after the product is assembled, contractors clean the structure only once annually with alkaline water and a soft cloth.
  • It’s the toughest protective coating offered. Hot-dip galvanizing, the most popular form of galvanization, is the process of submerging metal parts in a bath of molten zinc to protect the metal. This protection occurs as the intact zinc coating prevents corrosive substances from reaching the underlying steel or iron. The zinc also acts as a sacrificial anode, which is the main component of a galvanic cathodic protection system used to protect buried or submerged metal from corrosion. This means that if the coating is scratched, the exposed steel or iron is protected by the remaining zinc. Lastly, the zinc protects its base metal by corroding before iron. This “unique metallurgical structure…gives outstanding resistance to mechanical damage in transport, erection, and service. Through every stage, every inch of the sheet metal product is protected, including recesses, sharp corners, and inaccessible areas. A full protective coating is applied within minutes and is independent of weather conditions unlike other coatings.
  • Galvanization is sustainable. If you’re a contractor who’s invested in eco-friendly construction practices, this sheet metal technique is what you’re looking for. The durability and longevity of steel building components mean fewer resources will be used to repair and/or replace parts down the road.

Q: What are the production processes of Galvanized Steel Sheet?

A: The galvanized steel production process includes two main stages: surface preparation and cleaning, and zinc coating on the steel. To ensure high quality and reliable corrosion resistance of galvanized steel, both stages are crucial and require accuracy and high technical standards.
  • Surface Preparation and Cleaning
This is the first and most important step in the galvanized steel production process. The goal of this stage is to clean the steel surface and remove rust, grease, and other contaminants to prepare for the next zinc coating process.
  • The steps involved are as follows:
a. Contaminant removal: The steel is passed through pickling tanks to remove dirt, grease, and other impurities from the surface. The pickling process is quick and efficient, ensuring that the zinc coating adheres firmly to the steel surface.
b. Sandblasting (if needed): For steel with heavy rust or requiring polishing, sandblasting is performed to clean the steel and prepare the surface for galvanizing.
c. Acid treatment: In some cases, acid may be used to clean the steel surface in detail and remove difficult contaminants.
Zinc Coating on the Steel
After the steel surface is thoroughly cleaned, the zinc coating process will be carried out. Zinc coating is the process of applying a layer of molten zinc, which provides a strong zinc coating firmly adhered to the steel surface through either electroplating or hot-dip coating methods.
  • The steps involved are as follows:
a. Electroplating: The steel is passed through a zinc solution tank. The use of electric current promotes a chemical reaction between the steel and zinc, resulting in a firm zinc coating on the steel surface. This method is common for galvanizing small and complex details.
b. Hot-dip coating: The steel is passed through a molten zinc bath at a high temperature, where the zinc melts and forms a firm zinc coating on the steel surface. This method is often used to galvanise large sheets or sheets of special sizes and shapes.
After the zinc coating stage is completed, galvanized steel is carefully inspected to ensure that the quality and technical properties meet the standards. Galvanized steel that has undergone this production process will have excellent corrosion resistance and durability, effectively serving the purpose of construction and industry.

Q: What are the common international standards for Galvanized Steel Sheet?

A: Galvanized steel standards are technical specifications and regulations established to ensure the quality and technical properties of galvanized steel produced and used properly. These standards are usually determined and issued by local or international organizations and government agencies.
Some common international standards related to galvanized steel include:
  • ASTM A653 / A653M: The standard of the American Society for Testing and Materials (ASTM) for continuously galvanized steel, continuously galvanized alloy steel, or continuously galvanized alloy steel sheets after welding.
  • EN 10346: The European standard for continuously hot-dip coated steel sheet and strip applied for continuously hot-dip coated galvanized steel and continuously hot-dip coated galvanized steel sheets after welding.
  • JIS G3302: The standard of the Japanese Industrial Standards (JIS) for continuously hot-dip galvanized steel sheet and strip.
  • ISO 3575: The international standard of the International Organization for Standardization (ISO) for continuously hot-dip zinc-coated steel sheet and coil.

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