Contents
Corten Steel vs Galvanized Steel
- John
Here is the difference: Corten steel forms a rust layer that protects it from further corrosion, while galvanized steel uses a zinc coating to prevent rust. That is why corten steel has a natural, weathered look, while galvanized steel has a shiny, metallic finish.
Below we will dive deeper into their key differences to help you understand which material suits your needs best.
Chemical Composition of Corten Steel vs Galvanized Steel
Corten steel
Corten steel(weathering Steel) is classified as a low-alloy, high-strength steel. It contains alloying elements like copper (Cu), chromium (Cr), nickel (Ni), and sometimes phosphorus (P) and silicon (Si). This composition allows it to form a protective rust layer and resist atmospheric corrosion.
Galvanized Steel
The steel is typically low-carbon steel, but its corrosion resistance comes from the zinc (Zn) coating. It mainly consists of iron (Fe) and contains a small percentage of carbon, usually between 0.05% and 0.25%.
Properties of Corten Steel vs Galvanized Steel
Appearance
Corten steel starts with a typical steel look, but over time it develops a unique rust-like patina. This patina gives it a rugged, earthy appearance that many find aesthetic appeal for architectural projects. It evolves and changes over time, creating a natural, weathered look.
Galvanized steel has a bright, silvery finish due to its zinc coating. This shiny, metallic surface remains consistent as long as the zinc layer is intact. It’s preferred in industrial or modern settings where a clean, polished look is needed. If the zinc coating eventually wears away, the steel will be exposed to rust.
Corrosion Resistance
The corrosion resistance of Corten and galvanized steel depends on environmental factors. Galvanized steel offers better protection in humid or marine settings, while Corten is more durable in dry or moderate climates over time.
Heat Resistance
Corten steel typically performs better than galvanized steel at high temperatures. Corten steel can withstand higher temperatures without significant degradation. Galvanized steel has a lower melting point due to its zinc coating, which can start to degrade at temperatures above 400°F (204°C). This makes galvanized steel less ideal for high-heat environments, as the zinc can vaporize or burn off.
Maintenance Requirements
Galvanized steel demands more ongoing upkeep. Once the zinc coating wears off or is damaged, it leaves the steel underneath exposed, which may require re-coating to restore protection.
In contrast, weathering steel generally requires little to no maintenance once its patina develops. This natural rust layer protects the steel long-term in appropriate conditions. However, in environments with constant moisture, it may need more attention to prevent accelerated corrosion.
Weldability
Corten steel is generally easier to weld than galvanized steel. The zinc coating can release toxic fumes when heated during welding, which requires special ventilation and safety precautions. Additionally, the coating around the weld may be damaged and need post-welding maintenance to restore protection.
Cost
Galvanized steel is cheaper upfront due to the lower cost of zinc coating. Corten steel, though more expensive initially, can save on long-term maintenance costs as it forms a protective patina, while galvanized steel may need re-coating over time.
Application of Corten Steel vs Galvanized Steel
Corten steel is ideal for architectural and outdoor designs, while galvanized steel is suited for practical, moisture-prone environments.
Corten steel:
- Architectural facades and cladding
- Outdoor sculptures and art installations
- Bridges and overpasses
- Retaining walls and landscape structures
Galvanized steel:
- Roofing and gutter systems
- Fencing and gates in residential and industrial areas
- Structural components in construction (beams, frames)
- Agricultural equipment and buildings (barns, silos)
Choose Between Corten Steel or Galvanized Steel
When choosing between Corten steel and galvanized steel, please consider the environment, appearance, maintenance, and cost to decide which steel fits your project best.
For top-quality steel solutions, look no further than Steel Pro Group. Our expert team is ready to provide professional guidance tailored to your specific needs. For more information or to discuss your requirements, please contact us today.
