AL1100 is a commercially pure aluminum plate (min. 99.0% aluminum) belonging to the 1000 series, known for its excellent corrosion resistance, high thermal/electrical conductivity, and superior formability. Widely used in applications prioritizing corrosion resistance and workability over extreme strength, it is a staple in industries such as food processing, chemical handling, and electrical components. Below is a detailed overview:
I. Basic Information
Alloy Series: 1000 series (Commercially pure aluminum)
Chemical Purity: Min. 99.0% aluminum, with trace impurities (e.g., Fe ≤0.35%, Si ≤0.25%)
Key Features:
High corrosion resistance in most environments (including food and chemicals).
Excellent formability (can be easily rolled, drawn, or stamped).
Good thermal/electrical conductivity (approx. 97% of pure aluminum).
Non-heat treatable (strength is enhanced via cold working).
II. Chemical Composition (Mass Fraction, %)
Element Content Range Element Content Range
Aluminum (Al) ≥99.0% Iron (Fe) ≤0.35%
Silicon (Si) ≤0.25% Copper (Cu) ≤0.05% – 0.20%
Manganese (Mn) ≤0.05% Zinc (Zn) ≤0.10%
Other Impurities Each ≤0.05%, Total ≤0.10% – –
III. Core Properties
1. Mechanical Properties (Typical Values, by Temper)
Property O Temper (Annealed) H14 Temper (Cold Worked)
Tensile Strength 95 – 125 MPa 150 – 180 MPa
Yield Strength ≤55 MPa ≥130 MPa
Elongation (δ5) 25 – 35% 5 – 10%
Hardness (HB) 25 – 35 45 – 55
Note: Cold working (e.g., rolling) significantly increases strength but reduces ductility.
2. Key Characteristics
Corrosion Resistance: Exceptional resistance to atmospheric corrosion, food acids, and many chemicals. Forms a self-healing oxide layer when exposed to air.
Formability: Can be deep-drawn, spun, or bent into complex shapes without cracking, making it ideal for intricate components.
Weldability: Easily welded using methods like MIG, TIG, or resistance welding, with no significant loss in corrosion resistance.
Thermal/Electrical Conductivity: High thermal conductivity (220 W/m·K) and electrical conductivity (approx. 61% IACS), suitable for heat exchangers and electrical applications.
Reflectivity: High reflectivity to light and heat, often used in reflective surfaces (e.g., lighting fixtures).
IV. Processing & Applications
Processing Methods:
Cold Working: Used to increase strength (e.g., H14, H18 tempers).
Annealing: Restores ductility after cold working (O temper).
Machining: Requires sharp tools and low cutting speeds to prevent chip welding.
Typical Applications:
Food & Beverage: Processing equipment, storage tanks, and packaging foil.
Chemical Industry: Corrosion-resistant pipes, tanks, and reactors.
Electrical: Bus bars, transformer components, and electrical connectors.
Architecture: Roofing, siding, and decorative elements due to its natural silver finish and corrosion resistance.
Heat Exchangers: Utilizing its high thermal conductivity.
V. Comparison with Other Aluminum Alloys
Property AL1100 (1000 Series) 3003 (3xxx Series) 6061 (6xxx Series)
Strength Low Moderate High
Corrosion Resistance Excellent Good Good
Formability Excellent Very Good Good
Weldability Excellent Good Good
Heat Treatability No No Yes
VI. Limitations & Considerations
Low Strength: Not suitable for load-bearing applications without cold working.
Softness: Prone to scratching and deformation in high-wear environments.
Galvanic Corrosion: Avoid contact with dissimilar metals (e.g., steel) in wet environments unless insulated.
Summary
AL1100 aluminum plate is a versatile material valued for its corrosion resistance, formability, and thermal/electrical conductivity. While its strength is modest compared to alloyed aluminum, its purity and adaptability make it indispensable in industries prioritizing chemical stability and ease of processing.