The most common metals used in die casting are aluminum, zinc, and magnesium alloys, with copper, lead/tin alloys used less frequently for special applications.
1. Aluminum Alloys (Most Widely Used)
· Common grades: A380, A383 (ADC12), A360, A413.
· Key properties: Lightweight (1/3 the weight of steel), high strength-to-weight ratio, good corrosion resistance, excellent thermal/electrical conductivity, and stability at elevated temperatures.
· Applications: Automotive parts (engine blocks, transmission housings), consumer electronics, aerospace components, and heat sinks.
2. Zinc Alloys (High Precision & Cost-Effective)
· Common grades: Zamak 3, Zamak 5, ZA-27.
· Key properties: Low melting point (~385°C), exceptional fluidity (enables thin walls as low as 0.3 mm), high impact strength, excellent surface finish, and easy plating.
· Applications: Small precision parts, electrical connectors, gears, locks, bathroom fixtures, and decorative hardware.
3. Magnesium Alloys (Lightest Structural Metal)
· Common grades: AZ91D, AM50, AM60B.
· Key properties: Lightest die-casting metal (density 1.78–1.83 g/cm³), superior strength-to-weight ratio, good machinability, and EMI shielding capability.
· Applications: Automotive lightweighting (seat frames, steering components), consumer electronics (laptop/phone housings), and aerospace parts.
4. Less Common Die-Casting Metals
· Copper alloys: High hardness, wear resistance, and corrosion resistance; used for plumbing valves, gears, and electrical contacts.
· Lead/tin alloys: High density, excellent dimensional stability; used for special corrosion-resistant parts and low-melting components (not for food contact).
Summary Table
| Metal Alloy | Density (g/cm³) | Key Advantage | Typical Applications |
|---|---|---|---|
| Aluminum | 2.7 | Lightweight & strong | Automotive, heat sinks |
| Zinc | 6.6 | Precision & low cost | Small parts, plating |
| Magnesium | 1.8 | Ultra-lightweight | Electronics, aerospace |
Aluminum, zinc and magnesium alloys are the three most widely used materials for die casting. Aluminum alloys stand out for their light weight, good strength, corrosion resistance and thermal conductivity, and are widely applied in automotive, electronic and thermal management parts. Zinc alloys feature great fluidity, low melting point and fine surface quality, ideal for high-precision small components and plated products. Magnesium alloys are the lightest among mainstream die-casting metals, favored for lightweight parts in automobiles and consumer electronics. Copper, lead and tin alloys are only adopted for specific industrial scenarios due to their special properties.
