1. what is the ASTM grade of Aluminum Alloy 3A21 Round Bar?
ASTM Equivalent: While 3A21 is a Chinese National Standard (GB/T) alloy, its closest international equivalent is 3003 (UNS A93003).
ASTM Standard: If specified in international projects, it would fall under ASTM B211/B211M (extruded bars, rods, and wires) or ASTM B221/B221M (extruded tubes and profiles).
Common Tempers: Similar to 3003, tempers like H12, H14, H16, or H22, H24 are used to control strength and ductility.
2. What are the mechanical properties of Aluminum Alloy 3A21 Round Bar?
3. What is the chemical composition of Aluminum Alloy 3A21 Round Bar?
Manganese (Mn): 1.0–1.6%
Iron (Fe): ≤ 0.7%
Silicon (Si): ≤ 0.6%
Copper (Cu): ≤ 0.2%
Zinc (Zn): ≤ 0.1%
Aluminum (Al): Balance
4. What is the application of Aluminum Alloy 3A21 Round Bar?
Chemical Equipment: Tanks, pipelines, and heat exchangers due to good corrosion resistance.
Food Processing: Equipment and containers (non-reactive with food products).
Building and Construction: Roofing, siding, gutters, and decorative trim.
General Fabrication: Formed parts, enclosures, and brackets requiring moderate strength.
Heat Exchangers: Used in automotive and industrial cooling systems.
Kitchenware: Cookware handles and utensils (combined with aluminum cladding for heat distribution).
5. What are the advantages of Aluminum Alloy 3A21 Round Bar?
Cost-Effective: Lower cost compared to high-strength alloys like 6061 or 7075.
Excellent Formability: Easily formed into complex shapes via bending, rolling, or extrusion.
Corrosion Resistance: Good resistance to atmospheric corrosion and many chemicals (except strong acids).
Weldability: Can be welded using common methods (e.g., MIG, TIG), though strength in the weld zone decreases slightly.
Lightweight: Lower density than steel, reducing overall weight in applications.
Surface Finish: Accepts paint, anodizing, or other coatings for enhanced appearance or corrosion protection.
