Skip to content Are you a manufacturer or contractor seeking a metal that withstands harsh environments? Perhaps you want something durable for long-term structural use without worrying about frequent maintenance. In either case, G90 galvanized steel is the ideal solution (Learn more in our complete PPGI and PPGL guide). Offering superior protection, it’s suitable for industrial fabrication, construction projects, and HVAC systems. Want to know more about G90 galvanized steel and its benefits? Let’s start!
What is G90 Galvanized Steel?
In G90 galvanized steel, the ‘G’ refers to galvanized steel, while the ‘90’ points towards the total weight of zinc coating on the sides of the steel sheet. G90 means the steel has a 0.90-ounce per square foot (oz/ft²) zinc coating, approximately 275 grams per square meter (g/m²).
This zinc creates a barrier against moisture and acts as a sacrificial anode, preventing corrosion and rust from damaging the underlying material. Here’s an overview of the key characteristics of G90 steel:
- Base material is often cold-rolled steel.
- Zinc adds around 1.6 mils (0.0016 inches, or 42 microns) to the overall thickness of the sheet.
- G90 steel is easy to cut, laser, bend, tap, and drill.
How is G90 Galvanized Steel Made?
If you wonder about the manufacturing process of G90 steel, here’s a step-by-step guide that gives you clarity:
Step 1: Surface Preparation
The first step in producing G90 steel is preparing the surface for finishing. It needs to go through a detailed cleaning procedure that involves three key steps:
- Degreasing: Degreasing is the removal of contaminants like oil, dirt, and grease using solvent-based or water-based cleaners. The goal is to ensure proper adhesion for subsequent coatings or soldering and prevent defects.
- Fluxing: In this, steel manufacturers apply a chemical agent to dissolve existing oxides, capture impurities, and form a protective layer.
- Pickling: After the metal undergoes processes such as soldering or welding, it’s placed in an acid bath. This removes flux residue and other contaminants, restoring the metal’s luster and a clean surface.
Step 2: Hot-Dip Galvanization
The prepared steel is then submerged in a molten zinc bath. So now what happens is that the steel reacts with the zinc to form a hard, zinc-iron alloy, creating a metallurgical bond. Manufacturers can adjust the coating layer thickness based on the post mass to meet the G90 requirement. The coating is then dried in water or air to avoid any smudges during industrial applications.
Step 3: Quality Checks
Finally, the manufacturers perform visual and physical quality checks. They ensure the steel has a uniform silvery-gray color and a consistent crystalline pattern. There are no black spots, rust, cracks, or peeling, which makes the material look appealing. In addition, they carry out tests like:
- Bend Test: Bend the steel 180°, and the coating shouldn’t crack or peel.
- Adhesion Test: Apply strong tape on the coated, galvanized steel and rip it off. If minimal peeling, this means the coating is strongly adhered to the steel’s surface.
G40 vs G60 vs G90 Comparison
Other than G90, you will also come across G60 and G40 steel; here’s an overview of their key differences so you can choose the right option:
- G40 Galvanized Steel: This G40 galvanized steel has 0.40 ounces of zinc applied per square foot of the steel surface.
- G60 Galvanized Steel: It has 0.60 ounces of zinc per square foot of steel.
- G90 Galvanized Steel: As mentioned earlier, the G90 galvanized steel has 0.90 ounces of zinc per square foot.
Aspect | G40 | G60 | G90 |
Zinc Coating Weight | 0.40 oz/ft² | 0.60 oz/ft² | 0.90 oz/ft² |
Corrosion Resistance | Basic protection and suitable for indoor use | Moderate protection, suitable for indoor/outdoor use | Incredible protection in harsh and corrosive environments |
Cost | Low | Mid-Range | High |
Lifespan | Quite short, preferred for low-exposure applications | Longer than G40, balanced durability | An extensive lifespan, which makes it suitable for long-term structural usage |
Best Uses for G90 Steel
Hot-dip G90 galvanized steel is one of the most versatile materials available, as it’s strong, durable, and can handle minor scratches and bumps. Here are some of the best uses of G90 steel that you can explore:
- Framing Buildings: Galvanized steel materials are used in most buildings’ support structures, from apartments to museums, stadiums, and offices.
- Reinforcing Roads: G90 steel also finds its way in reinforcing roads. Even when the materials around the roads, including concrete, are damaged or cracked, the galvanized steel remains in its new condition.
- Automotive and Machinery: In the automotive industry, you can use G90 steel to manufacture durable vehicle body parts, such as body panels, chassis, frames, and undercarriage components for cars and trucks. Moreover, it’s a critical component of agricultural and industrial machinery.
- Household Appliances: G90 is widely used as the primary steel material for home appliances, found in HVAC systems for ductwork, housings, and air-conditioner casings. In addition, washing machine drums and refrigerator panels also have galvanized steel.
Benefits of G90 Steel
Galvanized steel offers numerous benefits, including corrosion resistance, a long lifespan, and low maintenance. Let’s discuss them in detail:
Physical Barrier Against Corrosion
G90 steel has a zinc coating that provides an impermeable barrier against oxygen, moisture, and other pollutants. Hence, you don’t have to stress about rust formation and steel damage anytime soon.
Reliable Strength
Another benefit of G90 steel is its reliable tensile strength and resistance to deformation under heavy loads. Therefore, you can employ it in load-bearing applications such as bridges, buildings, and industrial frameworks.
Long Lifespan
What truly makes G90 steel in demand is its long lifespan. Once installed, you can expect it to easily last for 50 to 75 years in a stable, rural environment and 20 to 50 years in harsh industrial and coastal areas. Given this long lifespan, you don’t have to worry about frequent replacements and can enjoy a long return on investment.
Cost-Effective
G90 galvanized steel is cost-effective since the hot-dip galvanization is way more budget-friendly than other advanced coatings. In addition, because zinc coating is visible, testing it requires minimal effort, which further saves you money.
Low Maintenance
Galvanized steel has a smooth surface that effectively resists dirt and grime. It’s quite easy to maintain, and with just the given tips, you are good to go:
- Make a gentle cleansing solution by mixing mild soap in warm water. Apply it on the surface using a soft cloth or sponge to avoid any water spots.
- For tougher spots, you can try a solution of vinegar and water and then use it on the G90 steel.
- If there’s any scratch or damaged area, fix it immediately using a zinc-rich primer or galvanizing spray.
- Make sure water doesn’t pool around G90 steel components, whether on roofs or fences. Don’t forget to carry out regular checks to keep the material in pristine condition.
Ready to Use
Galvanized steel doesn’t require any further coating or preparation after initial manufacturing. Once the zinc layer is applied, it eliminates the need for on-site treatments such as painting or sealing. This significantly reduces installation time and labor costs, especially in large-scale projects where consistent quality is needed.
Market Pricing and Availability
The market pricing for galvanized steel varies based on the zinc coating grade, raw steel prices, and regional demand. G40 is typically the most cost-effective option, while G60 sits in the mid-range and offers a blend of corrosion resistance and affordability.
However, G90 has a heavier zinc coating and comes at a slightly higher price tag compared to the other two. Here are some factors that affect the availability of the G90 steel:
- Regional Manufacturing Capacity: The availability of G90 steel also depends on the region. For instance, areas with multiple steel production facilities offer maximum G90 steel inventory and have short lead times.
- Bulk Demand for Industrial Projects: If there’s a large infrastructure or fabrication order, it can tighten the supply chain for some time, which results in availability challenges.
How to Find a Reliable G90 Steel Supplier?
You must find a reliable supplier for G90 steel as it minimizes quality issues and downtime. The following are the tips that can help you in selecting the right one:
- Check Industry Certification: First things first, you should ensure the supplier meets ASTM standards for galvanized steel and also adheres to quality certifications such as ISO 9001.
- Go through the Product Range: Good suppliers often have a wide product range offering multiple gauges, widths, and coil or sheet formats. This saves you time as you can source everything from one place rather than contacting multiple suppliers from different regions.
- Check Customer Reviews: Before you finalize the deal with a supplier, you must check all the available customer reviews. Learn what other fabricators and contractors have to say about their products, gauge overall reliability, and then order your desired products. Also, compare pricing and contact terms of different suppliers to make sure you get a fair deal.
Conclusion
G90 galvanized steel is becoming popular among contractors due to its incredible tensile and yield strength. It’s also formable and machinable, allowing for diverse usage. To understand how G90 compares to other standards, check out our G60 vs G90 vs Z275 coating grades comparison. Wondering where you can get top-notch steel products for your needs? Get in touch with Zhaojian Steel today and make your projects more reliable.
