Comparison of Aluminum-Magnesium-Manganese Plates and Alu-Zinc Coated Steel Plates

Aluminum-magnesium-manganese (Al-Mg-Mn) plates and aluminum-zinc (Alu-Zinc) coated steel plates are both used in construction and industrial applications. However, their materials, properties, and uses are different. The key differences are explained below.

1. Material Composition

Al-Mg-Mn Plates
These plates are made from aluminum with small amounts of magnesium and manganese.

• Aluminum provides light weight and oxidation resistance.

• Magnesium adds softness.

• Manganese improves corrosion resistance and strength.
  Common grades: 3003, 3004.
  These plates are known for being light, durable, and easy to form.

Alu-Zinc Steel Plates
These steel plates are coated with an aluminum-zinc alloy (55% aluminum, 43.4% zinc, 1.6% silicon).

• The coating forms a strong protective layer.

• This structure helps prevent rust and corrosion.

• The layer is created by solidifying the alloy at 600°C.

2. Corrosion Resistance

Al-Mg-Mn Plates

• Aluminum forms a protective oxide layer naturally.

• Fluorocarbon paint is often added to improve resistance to acid, alkali, and oxidation.

• They resist corrosion better than alu-zinc steel in many environments.

Alu-Zinc Steel Plates

• Zinc wears away first to protect the steel.

• When zinc is depleted, aluminum forms an oxide layer to slow corrosion.

• Still, corrosion resistance is generally lower than Al-Mg-Mn plates.

3. Heat Resistance

Al-Mg-Mn Plates

• Melting point: 660°C

• Above 150°C, strength decreases quickly.

• In case of fire, the roof melts and allows heat to escape upward, slowing horizontal fire spread.

• These plates meet the A1 fire resistance standard.

Alu-Zinc Steel Plates

• Can resist temperatures above 300°C.

• Used in ovens, lamp housings, and other high-temperature products.

4. Durability

Al-Mg-Mn Plates

• Light, rust-free, weldable.

• Easy to form and install.

• Can last 50 years or more with proper installation.

Alu-Zinc Steel Plates

• Must be stored in dry, indoor spaces.

• Sensitive to moisture and acidic conditions.

• Outdoor storage requires rain protection.

• Service life is about 15 years under normal use.

5. Weight

6. Application Areas

Al-Mg-Mn Plates are used in:

• Airports

• Exhibition halls

• Factories

• Stadiums

• Villas

• Train stations

• Convention centers

Alu-Zinc Steel Plates are used in:

• Building materials

• Household appliances

• Automobiles

• Machinery

• Ships

• Environmental systems

Comparison Table