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Hot Dip Galvanized Steel Coil

Thickness: 0.12–6.0mm
Width: 600–1500mm
Zinc coating: 30–600g/m²
Surface: Coated
Process: Hot-rolled
Coil ID: 508/610mm
Length: Customized
Standard sizes: e.g., 0.12–6.0×1500mm

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Description

DX51D Galvanized Steel Coil

What is Hot Dip Galvanized Steel Coil ?

Hot Dip Galvanized Steel Coil is created through a process where steel coils are immersed in a molten bath of zinc. This process, known as hot - dip galvanizing, forms a protective zinc coating on the surface of the steel. The zinc coating acts as a sacrificial layer, meaning it corrodes in place of the underlying steel when exposed to moisture and air, thereby significantly extending the lifespan of the steel. This unique combination of steel's strength and zinc's corrosion - resistant properties makes hot dip galvanized steel coil a top choice for various industries.

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Key Features and Benefits

Exceptional Corrosion Resistance

As mentioned earlier, the zinc coating provides outstanding protection against corrosion. This makes hot dip galvanized steel coil ideal for outdoor applications, such as roofing, fencing, and outdoor structures, where it can withstand harsh environmental conditions for years without significant degradation.

Cost - Effectiveness

Although the initial investment in hot dip galvanized steel coil may seem higher compared to some uncoated steel products, its long - term cost - effectiveness is undeniable. The reduced need for frequent maintenance, repairs, and replacements due to its corrosion resistance results in substantial savings over the product's lifespan.

High Formability

The hot dip galvanized steel coil retains the formability of the base steel. It can be easily bent, punched, cut, and welded, allowing manufacturers to create a wide variety of products with complex shapes. This property makes it suitable for applications in the automotive, appliance, and construction industries, among others.

Versatile Applications

Thanks to its unique properties, hot dip galvanized steel coil finds applications in numerous industries. In the construction industry, it is used for roofing, wall cladding, and structural components. In the automotive industry, it is utilized for manufacturing vehicle bodies, chassis parts, and interior panels. It is also commonly used in the production of household appliances, such as refrigerators, washing machines, and ovens.

Applications

Construction Industry:

Hot dip galvanized steel coil is widely used in the construction of residential, commercial, and industrial buildings. It is used for roofing sheets, wall panels, gutters, downspouts, and structural supports. Its corrosion resistance and durability make it a reliable choice for building structures that need to withstand the test of time and various weather conditions.

Automotive Industry:

In the automotive sector, hot dip galvanized steel coil is used to manufacture vehicle bodies, chassis components, and interior panels. The corrosion resistance of the galvanized steel helps in protecting the vehicle from rust and extends its lifespan, especially in areas where the vehicle is exposed to moisture, salt, and other corrosive elements.

Appliance Manufacturing:

Household appliances often require materials that are both strong and corrosion - resistant. Hot dip galvanized steel coil is used to make the outer shells of refrigerators, washing machines, ovens, and other appliances. It provides a sturdy base while also protecting against rust, ensuring the longevity of the appliances.

Infrastructure Projects:

For infrastructure projects such as lamp posts, railings, and signage, hot dip galvanized steel coil is a popular choice. Its ability to resist corrosion in outdoor environments makes it suitable for these applications, where maintenance and replacement can be costly and inconvenient.

The Manufacturing Process

Preparation of Steel Coil:

The journey of a hot dip galvanized steel coil begins with the selection of high - quality steel coils. These coils are first thoroughly cleaned to remove any impurities, such as oil, rust, or mill scale. This step is crucial as a clean surface ensures better adhesion of the zinc coating.

Acid Pickling:

After cleaning, the steel coil is immersed in an acid bath, usually hydrochloric acid or sulfuric acid. This pickling process further removes any remaining contaminants and creates a chemically reactive surface on the steel, which is essential for the zinc to bond effectively.

Fluxing:

Next, the pickled steel coil is dipped into a flux solution. The flux serves two important purposes. It protects the steel surface from oxidation before it enters the molten zinc bath and also helps in the formation of a smooth and even zinc coating.

Galvanizing Bath:

The heart of the process is the immersion of the prepared steel coil into a molten zinc bath, which is maintained at a temperature typically between 435 °C and 455 °C (815 °F - 850 °F). As the steel coil is submerged, a metallurgical reaction occurs, leading to the formation of a series of zinc - iron alloy layers on the surface. The thickness of the zinc coating can be precisely controlled by adjusting the immersion time and the withdrawal speed of the coil from the bath.

Cooling:

Once the steel coil is withdrawn from the zinc bath, it is allowed to cool. This can be done either by air - cooling or water quenching, depending on the desired properties of the final product. Cooling solidifies the zinc coating and ensures its uniformity.

Finishing:

After cooling, the galvanized steel coil may undergo additional finishing processes such as leveling, tension leveling, or slitting. These processes help in achieving the desired thickness and dimensions for the specific applications.

Inspection and Testing:

Quality control is a vital part of the manufacturing process. Rigorous inspections and tests are carried out to ensure that the coating thickness, adhesion, and overall quality of the hot dip galvanized steel coil meet the required industry standards.

STANDARD & GRADE

HOT-DIP GALVANIZED STEEL COILS
	ASTM A653M-06a	EN10327:2004/10326:2004	JIS G 3302-2010	AS-NZS 4534-2006
Commercial Quality	CS	DX51D+Z	SGCC	G1+Z
STRUCTURE STEEL	SS GRADE 230	S220GD+Z	SGC340	G250+Z
	SS GRADE 255	S250GD+Z	SGC400	G330+Z
	SS GRADE 275	S280GD+Z	SGC440	G350+Z
	SS GRADE 340	S320GD+Z	SGC490	G450+Z
	SS GRADE 550	S350GD+Z	SGC570	G500+Z
		S550GD+Z		G550+Z