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Galvalume steel coil refers to steel sheets coated with an alloy of zinc and aluminum to offer unmatched protection against corrosion. Available in multiple variations, each exhibiting unique properties, these coils are ideal for a plethora of applications.
Commercial galvalume steel coil
This features an 80/20 zinc/aluminum blend alloy. The dominant zinc forms a barrier protecting the steel from moisture and corrosion. At the same time, the aluminum forms a reflective surface that protects the steel from heat. The combination of these elements makes this type ideal for roofing and siding applications where corrosion resistance and thermal retardance are paramount.
SS and JS grade Galvalume steel coils
The SS grade coils are characterized with a 55% aluminum, 43% zinc, and 2% silicon composition. Conversely, the JS grade variety comes with a 50% aluminum and 50% zinc content. These grades of galvalume steel offer unequaled longevity and superior protection against corrosion. They are thus ideal for residential and commercial roofing and high-value applications like automotive parts and industrial equipment.
High durability galvalume steel coils
This type of coil comes with an elevated zinc content, which augments corrosion resistance in particularly harsh environments like coastal areas, chemical plants, and agricultural settings. Whether used in electrical enclosures or marine applications, these coils provide extended durability.
Microloc galvalume steel coils
The Microloc variation features a patented coating technology that enhances its resistance to edge rusting. In addition, the application of this coating includes a tighter, more uniform coverage that is unmatched in protectiveness, especially in humid environments prone to developing edge rust.
Anti-fingerprint galvalume steel coils
This steel coil has a coating that minimizes fingerprints and smudges, thus maintaining its aesthetic quality. The coating is tailored for applications where visual appearance is imperatively key, such as in appliances and architectural panels.
Galvalume steel coils feature remarkable characteristics that make them an attractive choice in various applications.
Corrosion resistance
The corrosion resistance of galvalume sheets remains unparalleled. As earlier discussed, zinc forms the first line of defense, while aluminum creates a tough, oxidized layer that prolongs the steel's lifespan. Together, these elements resist moisture and other corrosive elements.
Durability
Galvalume steel coils are widely recognized for their exemplary durability. Thanks to the alloying of zinc and aluminum, which not only creates a robust coating that withstands more than just daily wear and tear but also makes the coils suitable for use in harsh industrial and marine environments.
Heat resistance
The heat resistance of galvalume steel coils is primarily attributed to the aluminum content in the coating. As mentioned, this metal reflects heat, which makes the coils ideal in roofing applications especially in regions that experience extreme temperatures. This feature also helps in reducing energy costs by keeping buildings considerably cooler.
Eco-friendly
Galvalume steel coils are comparatively more eco-friendly than their counterparts, such as galvanized steel. The use of aluminum and zinc in the coating not only renders the steel long-lasting and reduces the need for frequent replacement, but also cuts down on the resources and energy required to manufacture new steel.
Aesthetic appeal
Last but not least, the silvery metallic finish of galvalume steel coils is characterized by sleekness and modernity. This appearance is especially indispensable in building exteriors and interiors, as it adds to the overall visual appeal without compromising on functionality.
Galvalume steel coils' durability results from a plethora of factors, ranging from their unique coating composition to the steel's innate properties.
The galvalume steel coating composition
As noted throughout this article, galvalume steel coils are exceptionally durable, thanks to their unique coating. As mentioned, this steel is typically composed of 55% aluminum, 43% zinc, and 1.5% silicon. This alloy combination offers superior resistance to corrosion by not only providing a cathodic shield as zinc does, but also forming a durable, oxidized layer of aluminum that protects the underlying steel.
Self-healing properties
The self-healing properties of galvalume's corrosion-resistant layer are as noteworthy as they are advantageous. Even if the surface gets scratched or damaged, the presence of zinc will help the aluminum to spread and regenerate the protective layer around the area. This effectively minimizes the risk of rust spreading and significantly prolongs the steel's life.
Resistance to extreme temperatures
Galvalume steel coils are subsequently highly resistant to extreme temperatures. Thanks to the aluminum in the coating, which creates a reflective barrier that minimizes heat buildup. This quality is especially beneficial in roofing applications, where the coils can withstand adverse weather elements while providing a cooler interior in buildings.
Inherent steel strength
Overall, the strength of the underlying steel is instrumental in the long-term performance of galvalume coils. Manufactured using high-quality, low-carbon steel, these coils are as resilient and impact- and bend-resistant as they come. This inherent strength makes them suitable for use in construction, automotive, and industrial applications.
Uniform coating
The uniformity of the galvalume coating contributes greatly to its durability. Whether applied by hot-dipping or electro-depositing, the even distribution of the zinc-aluminum alloy ensures consistent protection across the entire coil. This reduces wear and minimizes maintenance needs.
Galvalume steel coils have a wide range of uses across diverse industries, thanks to their corrosion resistance, durability, and heat retardance properties.
Construction industry
Here, these coils are predominantly used for roofing and siding applications. The combination of zinc and aluminum provides unparalleled protection against rust, making them ideal for use in adverse weather conditions. In addition, their reflectivity keeps buildings cooler, reducing energy costs. They are thus a staple in both residential and commercial construction.
Automotive applications
Galvalume steel coils also come in handy in the manufacturing of various automotive parts. The coils' durability and resistance to corrosion make them suitable for use in body panels, exhaust systems, and undercarriage components. Their ability to withstand moisture and salt, as well as extending the vehicle's overall lifespan, is particularly impressive.
Appliances
The resistance to fingerprint and aesthetic appeal makes galvalume coils ideal for use in appliances like refrigerators, washing machines, and ovens. The coating protects against corrosion while maintaining a sleek, modern appearance. This is particularly critical for appliances that are frequently exposed to moisture and heat.
Agricultural equipment
In this arena, galvalume steel coils are used to manufacture silos, barns, and other agricultural structures. The coils' ability to withstand chemicals, as well as the salty and moist air typically encountered in farming environments, makes them indispensable for manufacturing equipment and storage solutions.
Electrical enclosures
Galvalume steel coils are regularly used to make electrical enclosures, particularly for the protection of vital components in industrial and outdoor settings. The combination of durability, corrosion resistance, and heat retardance ensures that these enclosures are protected from adverse environmental elements while providing a long service life.
To select the right kind of galvalume steel coil for clients or one's business, there are several key factors to consider. Here are the most essential ones.
Coating weight
Galvalume steel coils come with varying coating weights. Lighter weights can be ideal for roofing applications, as they are easier to handle and install, while heavier coatings provide longer life for structures where the coating will be subjected to constant physical stress or harsh environmental conditions.
Thickness
As previously mentioned in this article, the thickness of the galvalume steel sheet can be an important determinant of its performance and application. Thicker coils are more durable and suitable for heavy-duty applications, while thinner coils offer flexibility and ease of installation in relatively lighter duty applications.
Surface finish
Galvalume steel coils come in multiple surface finishes, such as flat or spangled. Each has its aesthetic and functional implications. For instance, spangled finishes might provide slightly better corrosion resistance due to their surface texture, although they may not be as smooth and visually appealing as flat finishes.
Mechanical properties
It is therefore crucial to check the steel's yield strength, tensile strength, and elongation properties. Selecting the right coil with optimal mechanical properties ensures the material can handle the requisite loads and stresses during both installation and in the long run.
Compatibility with existing systems
As a business owner or buyer, it is essential to consider previous materials when selecting galvalume steel coils. For instance, if clients' roofs, structures, or manufacturing systems were originally built using galvanized or another type of steel, they would probably benefit from continuity in material choice. This not only ensures aesthetic consistency but also makes for an easier installation process, as well as potentially reducing the need for modifications.
Supplier reputation
Still on the topic of supplier, it is imperative to work with reputable suppliers when purchasing galvalume steel coils. As a business owner, the preferred suppliers should not only provide quality products that meet specified standards, but they should also offer consistent coil availability. In addition to these, they should be capable of delivering reliable documentation for quality assessment and compliance purposes.
Yes, galvalume coils are worth it. Their unparalleled corrosion resistance, particularly in harsh coastal environments, give them a long lifespan. In addition, these coils outperform their galvanzied counterparts by lasting longer when exposed to adverse weather conditions. They are therefore more cost-effective over time and make for a worthwhile investment.
The unique composition and the coating on galvalume steel coils are the hallmark of their durability. In other words, the coating, which contains 55% aluminum and 43% zinc, offers superior protection against corrosion because zinc acts as a sacrificial anode while aluminum forms a tough oxidized layer. Together, the duo makes the coils long-lasting and resilient to rust.
While both galvanized and galvalume coils are coated to prevent corrosion, their coatings are the key to their differences. Galvanized steel comes with zinc alone, whereas Galvalume steel includes zinc and aluminum, as discussed earlier. While both methods are effective in protecting the steel from corrosion, the duo offers distinct advantages that make each variation ideal for particular applications.
One of the most common causes of galvalume steel coil failure is poor quality and inappropriate coil handling during planting. Some notable examples of such practices include bending, dropping, and dragging, as well as excessive force, which can cause damage to the coating and distortion of the steel. All these subsequently lead to corrosion, reduced lifespan, and structural failure.
Yes, galvalume steel coils have a high recycle-ability. They are primarily made of steel, which is one of the most easily and commonly recycled materials. By recycling this metal, its energy requirements for production are lowered by up to 75%, as are emissions and environmental impact. It thus makes for a more sustainable and eco-friendly choice.
