3-Series Aluminum Core Grades: 3003 & 3A21 Aluminum Plates – Key Properties & Uses

I. 3-Series Aluminum: Core Advantages

3-series aluminum uses manganese as the main alloying element (no copper), ensuring inherent corrosion resistance.
Easy processability: Compatible with stamping, bending, welding, and stretching for complex forming.
Balanced mechanics: Higher strength than pure aluminum, with good toughness to avoid brittleness.
Versatile surface treatment: Works with anodizing, spraying, and electrophoresis for custom looks.
Cost-effective: Ideal for medium-strength, corrosion-resistant needs without overspending.

II. 3003 Aluminum Plate: Versatile & Budget-Friendly

Core Properties
With 1.0–1.5% manganese, 3003 is a top-used 3-series grade.
Resists atmospheric and fresh water corrosion, suitable for humid environments.
Excellent weldability (argon arc, gas, spot welding) with stable post-weld performance.
Good cold working plasticity for thin-walled parts and stampings with minimal deformation.
Moderate strength for general structural components, no extra reinforcement needed.

Key Applications
Daily necessities: Kitchenware, tableware, insulated boxes, beverage can shells.
Industrial: Pipes, fuel tanks, ventilation ducts, equipment enclosures.
Construction: Decorative panels, curtain wall auxiliaries, ceilings.
Auto/medical: Basic auto parts, medical device housings.

III. 3A21 Aluminum Plate: High-Strength & Corrosion-Resistant

Core Properties
Featuring 1.2–1.6% manganese (higher than 3003), it’s optimized for harsh conditions.
Superior corrosion resistance: Outperforms 3003 in acid-base, marine, and extreme environments.
Enhanced strength: Slightly stronger than 3003; cold working boosts strength for heavy loads.
Reliable processability: Maintains bending, stamping, and welding performance with precise forming.
Good low-temperature toughness: No embrittlement in cold settings.

Key Applications
Industrial: Chemical pipelines, liquid storage tanks, corrosion-resistant liners.
Transportation: Auto fuel tanks, marine accessories, rail transit parts.
Construction: Outdoor curtain walls, high-humidity decor, door/window frames.
Precision/aerospace: Instrument enclosures, aerospace auxiliary materials.

IV. Quick Differences & Selection Tips

Core Distinctions
3A21 has higher manganese: Better strength and corrosion resistance than 3003.
3003: Focuses on versatility and cost; 3A21: Prioritizes harsh-environment durability.
3A21 is slightly more costly due to enhanced properties.

Selection Guide
Choose 3003 for conventional use (daily items, indoor decor, ordinary equipment) to save costs.
Opt for 3A21 for harsh environments (marine, chemical, outdoor long-term use) or high-strength needs.
Both suit welding/stamping – pick based on environment and budget.

V. In-Stock Supply Advantages

We keep full inventory of 3003 and 3A21 with customizable specifications (thickness, width, length).
Fast delivery: Spot shipment avoids production delays.
Quality assurance: Industry-standard products with material certificates.
One-stop service: Cutting, bending, welding customization available.
For further questions or tailored advice, contact us for professional support and reliable supply!