Hot-dipped Galvanized steel grating

by Sunj Grating Limited

The use of hot-dip galvanized steel gratings is widespread, including in chemical plants, food processing facilities, water treatment facilities, and power plants.

Hot-dip Galvanized Steel Grating
This process involves melting zinc ingots at high temperatures, adding some auxiliary materials, and then dipping structural metal parts into a galvanizing bath to attach a zinc layer to the metal parts. Among the advantages of hot-dip galvanizing are its strong anticorrosion ability, good adhesion, and hardness of the galvanized layer. After galvanizing, the weight of the product increases, and the amount of zinc we usually refer to is for hot-dip galvanizing.

The Process Flow for Galvanized Steel Gratings

Step 1: Pre-Treatment:

To remove rust, paint, oil, and other contaminants, steel gratings are shot blasted or degreased. The mill scale is removed from galvanized steel grating by immersing it in an acid bath. In this process, zinc-iron alloys are formed on the grating surface. The low melting point of zinc-iron alloys prevents iron from rusting because they have a lower melting point than steel.

Design Consultation for steel gratings
Steel gratings raw material

Step 2:Pickling:

In pickling, the oxide layer on the galvanized steel grating is removed. By immersing them in an acid bath, the gratings are cleaned. Acids such as hydrochloric acid are commonly used for pickling. Pickling agents are also known as “pickling agents” because hydrochloric acid helps remove oxide layers quickly.

Step 3:Fluxing:

Fluxing removes impurities from galvanized steel grating surfaces. Using an acidic solution and a current, impurities are removed from the gratings. It is most common to use zinc chloride as a flux. The zinc chloride provides a barrier to corrosion and accelerates the removal of impurities. It is therefore also referred to as a “flushing agent”.

weled steel gratings
press-locking of steel gratings

Step 4:Hot-Dip Galvanizing:

In hot-dip galvanizing, zinc is melted and dipped into the gratings. Zinc-iron alloys are formed on surfaces of galvanized steel gratings after molten zinc bath is applied. Due to this, hot-dip galvanizing is also sometimes known as “zinc-iron alloying.” Hot-dip galvanizing also prevents corrosion.

Step 5:Cooling:

A cooling process follows hot-dip galvanizing of the gratings. Solidifying the zinc-iron alloy on the surface of the gratings is helped by the cooling process. “Air-cooled” grating is made from galvanized steel that has been cooled in the air. “Water-cooled” gratings are galvanized steel that have been cooled in water.

Galvanized steel grating in Singapore
Dimension check for steel gratings

Step 6:Passivation:

The only step of the galvanized steel grating process not always performed is passivation. Passivation involves dipping gratings into an acidic solution. The gratings used in this process must be made from stainless steel. In order to eliminate contaminants from grating surfaces, passivation is the primary objective.

Step 7:Packaging(1 days)

Our packing materials ensure that the products are not damaged during transport. Steel gratings require special care and attention during packaging. You can fill the gaps between each grate with styrofoam peanuts or bubble wrap in order to protect them from damage. Wrap each grate in a layer of plastic film, place it in a box or crate, and wrap it with a layer of plastic film. Make sure the box or crate is taped together and labelled with the contents and the date. When you store or transport your steel grates, follow these tips to prevent corrosion and rust.

the packing of steel gratings