Galvanized grating, also called galvanized steel grating or galvanized steel bar grating, refers to the steel bar grating made of mild carbon steel through hot dipped galvanized surface treatment.
Mild carbon steel provides an economical, high strength for uses in most industrial and commercial applications. And hot dipped galvanized surface treatment supplies excellent corrosion resistance performance for durability.
Steel grating is available in various material, such as stainless steel, aluminum, and galvanized steel. Among them, the galvanized steel grating is the most cost effective and economical type with long service life and high load. And it is the most widely used in both industrial, commercial and residential applications.
Specification for Galvanized Steel Grating
| Specification | Description |
| Material | Galvanized carbon steel |
| Manufacturing Process | Welded, swage-locked, or press-locked |
| Surface Treatment | Hot-dip galvanized |
| Surface Type | Standard plain surface, serrated surface |
| Cross Bar Spacing | Customizable, typically 2″ or 4″, center to center |
| Bearing Bar Spacing | Customizable, typically 15/16″ or 1-3/16″, center to center |
| Bearing Bar Height | Customizable, typically 20mm to 60mm |
| Bearing Bar Thickness | Customizable, typically 2mm to 5mm |
| Cross Bar Size | Customizable, typically 4mm to 10mm diameter |
| Slip Resistance | Serrated or plain surface, depending on the application |
| Installation Method | Welding, clips, or bolts and nuts, depending on the application |
| Compliance | Meets industry standards and applicable building codes, including ASTM, ISO, and ANSI/NAAMM |
Step 1: Pre-Treatment
The surface of the steel gratings cleans the shot blasting or degreasing to remove rust, paint, oil, and other contaminants. Galvanized steel grating is placed in an acid bath to remove the mill scale. By using this process, a zinc-iron alloy forms on the surface of the gratings. Zinc-iron alloy has a lower melting point than steel, which is a barrier to prevent iron rusting.
Step 2: Pickling
The purpose of pickling is to remove the oxide layer on the surface of the galvanized steel grating. This is done by immersing the gratings in an acid bath. The most commonly used acid for pickling is hydrochloric acid. Because hydrochloric acid helps to remove the oxide layer quickly, it is also known as a “pickling agent.”
Step 3: Fluxing
Fluxing is a process that helps to remove impurities from the surface of the galvanized steel grating. The impurities are removed by passing a current through the gratings in an acidic solution. The most commonly used flux is zinc chloride. Zinc chloride provides a barrier against corrosion and helps to remove impurities quickly. For this cause, it is also known as a “fluxing agent”.
Step 4: Hot-Dip Galvanizing
Hot-dip galvanizing is a method in which the gratings are dipped in a molten zinc bath. By using molten zinc bath in galvanized steel grating process, a zinc-iron alloy is formed on the surface of the gratings. That’s why hot-dip galvanizing is also known as “zinc-iron alloying.” Also, hot-dip galvanizing provides a barrier against corrosion.
Step 5: Cooling
After hot-dip galvanizing, the gratings are cooled in air or water. The cooling process helps to solidify the zinc-iron alloy on the surface of the gratings. Galvanized steel grating that has been cooled in air is known as “air-cooled” grating. And galvanized steel grating that has been cooled in water is known as “water-cooled” grating.
Step 6: Passivation
Passivation is the only process flow of galvanized steel grating that is not performed in all cases. Passivation is a process in which the gratings are dipped in an acidic solution. To achieve this process, the gratings must be made of stainless steel. The primary objective of passivation is to eliminate contaminants from the exterior of the gratings.
Step 7: Packaging
To ensure that the products are not damaged during transport, we use high-quality packing materials.the packing of steel gratings requires special care and attention. Be sure to wrap each grate in a layer of plastic film, place them in a box or crate, and fill the gaps between the grates with packing material such as styrofoam peanuts or bubble wrap. Seal the box or crate with tape and label it with the contents and the date. These packing tips will help to ensure that your steel grates are protected from rust and corrosion during storage or transportation.
Applications
- Hot-dip galvanized steel grating features: high strength, light structure: the solid grid pressure welding structure makes it high load-bearing, light structure, easy to be lifted, etc.; beautiful appearance, durable.
- Hot-dip galvanized steel grating uses: widely used in petrochemical, power plant, water plant, warehouse construction, sewage treatment plant, municipal engineering, sanitation engineering and other fields of platform, walkway, trestle, trench cover, manhole cover, ladder, fence, guardrail, etc.
