Galvanized Sheet, Zinc-Aluminum Alloy Sheet, and Aluminum-Zinc Alloy Sheet
1. Zinc-Aluminum Alloy Sheet
Also known as low-aluminum galvanized steel, this sheet has a coating composition of 5% aluminum, 95% zinc, and trace rare earth elements.
Key Features:
- Excellent plasticity and adhesion, ensuring durability even after deformation.
- Superior corrosion resistance, lasting 2 to 3 times longer than conventional hot-dip galvanized sheets.
- Good coating and weldability, making it ideal for corrosion-resistant applications.
- High toughness, with corrosion resistance and formability similar to electro-galvanized sheets.
- Commonly used as a base material for coatings in weather-resistant environments.
2. Aluminum-Zinc Alloy Sheet (GL)
This sheet has a coating composition of 55% aluminum, 43.3% zinc, and 1.6% silicon.
Key Features:
- Smooth surface with 2 to 6 times better corrosion resistance than hot-dip galvanized sheets.
- High-temperature durability, maintaining color and shape up to 315°C.
- Better resistance to water and soil corrosion compared to hot-dip galvanized or aluminum sheets.
- High heat reflectivity of over 75%, double that of standard galvanized sheets.
- Excellent paintability and processability, leading to widespread global use as a replacement for galvanized sheets.
3. Hot-Rolled Galvanized Sheet
This sheet is produced by pickling and galvanizing hot-rolled steel, skipping the cold-rolling process.
Key Features:
- Used in construction, automobiles, steel silos, railway passenger cars, and highway guardrails.
- Lower production costs due to the omission of cold rolling, offering a price advantage.
- Performance is comparable to cold-rolled galvanized sheets, despite differences in manufacturing.
- Currently, production in China is limited, with most manufacturers using cold-rolled steel as a base.
