Galvanized Grating

Galvanized Grating

After undergoing anti-corrosion galvanization, the steel grating is commonly referred to as galvanized steel grating. Generally, there are two types of galvanized steel grating: cold galvanized steel grating and hot-dip galvanized steel grating.

Raw material of galvanized grating (Customizable)

Raw material of bearing bar: They are made of Q235A or stainless steel and are available in plain, serrated, and I-section profiles. Common specifications include 205, 255, 253, 325, 325, 405, 403, 505, 655, 756, 1008, 10010, etc.

Raw material of cross bar: They are made of Q235A or 304 stainless steel round bars, twisted square bars, square bars, or hexagonal bars. Cross square bars are formed by drawing and twisting square billets, and their common specifications include 55, 66, 8*8mm, etc. These are the four main characteristics that distinguish genuine hot-dip galvanized steel grating.

Advantages of glavanized grating

  • Material-saving: The most material-efficient method under the same load conditions, consequently reducing the material requirements of the supporting structure.
  • Easy construction: Use bolts or welding to secure the pre-installed supports, which can be easily completed by a single person.
  • Shortened construction period: The product does not require on-site processing, allowing for rapid installation.
  • Long-lasting: Pre-treated with hot-dip galvanization before leaving the factory, providing excellent resistance to impacts and heavy pressures.
  • Reduced wind resistance: Due to good ventilation, it offers minimal resistance against strong winds, thereby reducing wind-induced damage.

How does AGICO Manufacture Galvanized Grating?

Raw Material Preparation

Based on customer requirements, preparing the bearing bars. Commonly used bearing bars have heights of 25mm, 30mm, and 40mm, with thicknesses of 3mm, 4mm, and 5mm. Cross bars are typically 6x6mm. The raw material, size and dimension, and surface treatment of the galvanized grating are all customizable.

Welding of Steel Grating

The welding of steel grating is done through mechanical pressure welding. High-pressure resistance welding machines are used, where a mechanical arm automatically places crossbars horizontally on evenly arranged bearing bars. The crossbars are then welded into the bearing bars using powerful electrical welding power and hydraulic pressure. This results in a steel grating with strong and stable welds, as well as high strength. However, when customizing irregular-shaped steel grating, there is more waste material, making it more expensive. Manual welding involves punching holes in the bearing bars first and then electrically welding the crossbars into the holes. This method is cheaper and can be used for smaller quantities.


After welding, the whole steel grating panel needs to undergo mechanical cutting based on the dimensions specified in the steel grating drawings. During the cutting process, strict control of dimensional errors is maintained. Once the cutting is completed, professional quality inspectors perform sampling checks on the cut steel grating panels. Any defective panels are re-cut.

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Final Products
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Video of our Galvanized Grating

Welding of Edge (Binding) Plates

Edge plates are welded to the steel grating using bearing bars of the same material type. Manual welding is employed, and before welding, the surface of the steel grating is cleaned to remove oil and stains. The weld is a single-side fillet weld. Each bearing bar of the steel grating needs to be welded to an edge plate. After welding, the surface is deslagged and smoothed by grinding.

Hot-Dip Galvanization

Hot-dip galvanization is an essential process for steel grating. Before galvanizing, the surface should be cleaned by sandblasting or shot blasting to remove rust, ensuring that there are no traces of oil, rust, or other contaminants. The average weight of the zinc coating after galvanization should be no less than 460 grams per square meter, and the quality should meet the requirements of GB/T13912.

Packaging and Transportation

After completing the above processes, the production of the steel grating is essentially finished. Contact the on-site construction management personnel and obtain a material list from them. Based on the specifications, quantity, and delivery date of the grating panels specified in the material list, the factory proceeds to package, load, and transport the processed steel grating panels. Typically, the grating panels are packaged in bundles, with each bundle containing 25 pieces of grating panels. The weight of each bundle is approximately 2 tons. After packaging, the grating panels are loaded using forklifts.

Advantages of AGICO’s Galvanized Grating

Attractive appearance and long-lasting durability

The galvanized surface treatment of the grating provides excellent corrosion resistance while maintaining a glossy and visually appealing appearance. As society has developed, there has been an increased emphasis on aesthetics and higher standards for the design of various products in our lives. Only when the demand for beauty is met can these products have practical value.

Excellent drainage performance

Galvanized grating is designed to have superior drainage capabilities. Generally, the drainage area of galvanized grating can reach around 85%, which is twice as effective as conventional drainage facilities. Furthermore, customized galvanized grating can be manufactured to meet specific drainage requirements.

Versatility for Diverse Applications

Our steel bar grating is designed to cater to a wide range of applications across various industries. Whether you require grating for industrial flooring, walkways, platforms, stair treads, or other specialized uses, our products are versatile enough to meet your specific needs. With customizable dimensions, bar spacing, and surface finishes, we can tailor our grating to fit seamlessly into your unique project requirements.

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galvanized grating final product

Long lifespan

10-50 years of life span, depending on the utilization environment. Galvanized grating is made of metal materials, which inherently provide good durability. However, it should be used in environments with minimal corrosive conditions. In reality, many environments where galvanized grating is used are prone to corrosion. Nevertheless, the galvanizing treatment significantly improves the lifespan of the grating. Additionally, it is resistant to debris accumulation, rain, snow, and self-cleaning, making it easy to maintain.

High strength and lightweight structure

The overall high-pressure welded structure of galvanized grating ensures high load-bearing capacity while remaining lightweight. It facilitates easy installation and lifting.

Difference Between Hot-dip and Cold-dip Galvanized Grating

Different Principles

Hot-dip galvanization, also known as hot-dip zinc coating, involves melting zinc ingots at high temperatures and adding auxiliary materials. The metal structure is immersed in the galvanizing bath, allowing the zinc layer to adhere to the metal structure. The advantages of hot-dip galvanized grating lie in its strong corrosion resistance and good adhesion and hardness of the zinc coating.

Cold galvanization, also known as electroplating, refers to applying a zinc coating to the surface of the workpiece by electrolysis using a zinc salt solution. Generally, no heating is required, and the amount of zinc applied is minimal. Cold galvanized coatings are prone to peeling, especially in humid environments.

Different Properties

Hot-dip galvanization is a chemical process and belongs to electrochemical reactions. It involves galvanizing the surface of the steel structure under hot-dip conditions, resulting in strong adhesion and resistance to peeling. It is commonly used in construction projects.

Cold galvanization, or electroplating, is a physical process that applies a thin layer of zinc to the surface of the workpiece. Therefore, the zinc layer is prone to peeling. Its corrosion resistance is far inferior to that of hot-dip galvanization. Cold galvanization is relatively cheaper in terms of cost.

Different Effects

The appearance of hot-dip galvanized coatings may not be as refined and bright as cold galvanized coatings, but the thickness of the zinc layer in hot-dip galvanization is tens of times greater. The anti-corrosion performance is several tens of times higher than that of electroplating.

Different Environmental Value

Hot-dip galvanization produces fewer pollutants, and the main pollutants in hot-dip galvanized grating are waste acids generated from pickling the workpieces.

Cold galvanization produces pollutants such as waste acids from pickling the workpieces, waste electrolyte from electroplating, and waste solutions from passivation processes.

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How to identify the quality of galvanized grating?

Galvanizing Thickness: Check the thickness of the galvanized coating on the steel grating. Generally, high-quality galvanized gratings should meet the specified standards, such as a requirement of 70μm or more for hot-dip galvanizing. A thicker galvanized coating provides stronger corrosion resistance.

Galvanizing Uniformity: Observe the surface of the steel grating. The galvanized coating should be uniform and continuous, without any noticeable defects or peeling. High-quality galvanized gratings should be free from visible black spots, bubbles, oxidation, or cracks.

Galvanizing Adhesion: Check the adhesion of the galvanized coating. You can gently scrape the galvanized surface with a blade or tool. The galvanized coating on a high-quality grating should not easily peel off or detach.

Weld Quality of the Grating: Examine the welds of the steel grating to ensure they are firm and uniform, without any visible cracks or looseness. The quality of the welds is crucial for the overall strength and stability of the grating.

Surface Smoothness: Evaluate the smoothness of the grating’s surface. There should be no obvious burrs, sharp edges, or irregularities.

Galvanizing Process: Familiarize yourself with the galvanizing process used for the steel grating. Generally, hot-dip galvanizing offers better corrosion resistance, while cold galvanizing is more susceptible to moisture-related issues. Choosing a high-quality galvanizing process can enhance the durability and anti-corrosion performance of the grating.

Please note that when identifying the quality of galvanized grating, it is advisable to consult professionals or refer to relevant industry standards and specifications.

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