What is the thickness of galvanized sheet coating?

1. The purpose of galvanizing

Galvanizing is to heat iron or steel to a certain temperature and then galvanize it in a hot-dip galvanizing tank to coat the steel surface with a layer of zinc and form a physical and chemical protective layer on the surface. This protective layer can effectively prevent the steel surface from being oxidized and corroded, and improve the durability and service life of the steel. Therefore, galvanizing is widely used in construction, steel structures, automobiles, home appliances, wires, pipelines and other industries.

2. Commonly used coating thicknesses

According to national standards, the thickness of galvanized sheets is usually between 0.15mm and 5.0mm. Common galvanized sheet thicknesses include 0.18mm, 0.2mm, 0.25mm, 0.3mm, 0.4mm, 0.5mm, etc. The thickness of the galvanized layer is usually expressed in terms of zinc layer mass concentration (i.e. weight ratio). Commonly used zinc layer mass concentrations include: 60g/m², 80g/m², 100g/m², 120g/m², 150g/m², 200g /m² etc.

Different coating thicknesses are suitable for different application scenarios. Generally speaking, the greater the thickness, the stronger the corrosion resistance, but the cost will also increase.

3. Corresponding application scenarios

1.60g/㎡ zinc layer: mainly used in light steel structures in indoor dry environments (house partitions, furniture, floors, ceilings, pipes, etc.).

2.80g/㎡ zinc layer: suitable for dry, general-purpose steel structures, such as investment buildings, auto parts, daily necessities, air conditioning radiators, bathroom heaters, etc.

3.100g/㎡ zinc layer: used in outdoor wind, sun, rain, and highly corrosive environments, such as rolling shutter doors, columns, auto parts, etc.

4.120g/㎡, 150g/㎡ zinc layer: It has strong corrosion resistance and is suitable for seaside and salt spray areas, such as fertilizer plants, seaport terminals, etc.

5. Zinc layer of 200g/㎡ and above: suitable for some occasions that require extremely high corrosion resistance, such as oil exploration, offshore drilling platforms, etc.

In short, choosing the appropriate coating thickness has an important impact on the service life and safety of steel materials.