Astm A463 Aluminized Steel
Advantages of ASTM A463 Aluminized Steel
Longer service life than regular galvanized steel in high-temperature environments
More cost-effective than stainless steel for heat-resistant applications
Excellent surface reflectivity for thermal efficiency
Strong metallurgical bond prevents peeling or flaking
Versatile for both indoor and outdoor service
- Description
Description
ASTM A463 is the standard specification for aluminized steel sheet coated by either Type 1 (Al-Si alloy) or Type 2 (pure aluminum coating). This material is widely used in high-temperature, corrosion-resistant, and heat-reflective applications due to its unique metallurgical bond between the steel substrate and aluminum coating.
1. Composition of ASTM A463 Aluminized Steel
Type 1 Coating (Al-Si Alloy, Code T1)
Type 1 uses an aluminum-silicon alloy containing approximately 5%–11% silicon, designed to provide excellent heat resistance and oxidation resistance.
Type 2 Coating (Pure Aluminum, Code T2)
Type 2 uses commercial-purity aluminum coating, offering high corrosion resistance, especially in atmospheric environments.
Typical Chemical Composition of Base Steel
(Values vary slightly based on grade and manufacturer)
| Element | Typical Range (%) |
|---|---|
| Carbon (C) | ≤ 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Aluminum Coating | 90–95% Al (T1), ~100% Al (T2) |
| Silicon (Si) | 5–11% (T1 only) |
2. Key Mechanical and Performance Properties
ASTM A463 aluminized steel is chosen for its balance of thermal stability, corrosion resistance, and formability.
Mechanical Properties Overview
| Property | Typical Range | Notes |
|---|---|---|
| Yield Strength | 170–280 MPa | Depends on base steel grade |
| Tensile Strength | 300–400 MPa | Stronger than pure aluminum sheets |
| Elongation | 25–35% | Good forming capability |
| Coating Mass | T1: 90 g/m² – 305 g/m² per side | As specified by A463 |
| T2: 60 g/m² – 185 g/m² per side | Higher corrosion resistance |
Performance Features
High heat reflectivity
Effective in ovens, heaters, and thermal shields.Excellent oxidation resistance
Type 1 maintains protective coating up to 650–800°C.Superior corrosion resistance
Aluminum coating protects steel from atmospheric rusting.Good formability
Suitable for stamping, drawing, and roll forming.Stable surface finish
Bright, smooth appearance suitable for exposed applications.
3. Applications of ASTM A463 Aluminized Steel
Type 1 (Al-Si Alloy) – Heat-Resistant Applications
Used where elevated temperatures require oxidation resistance.
Common Uses
Automotive exhaust components
Furnace parts and heat shields
Heat exchangers
Industrial drying ovens
Chimney liners and flue pipes
Cooking appliances and baking equipment
Type 2 (Pure Aluminum) – Corrosion-Resistant Applications
Suited for environments with moisture, chemicals, or atmospheric corrosion.
Common Uses
HVAC housings and air-handling systems
Roofing and building panels
Agricultural equipment
Water heaters and storage tanks
Electrical enclosures
Transport containers and ducting
