Understanding Aluminum Alloy Selection: Choosing the Right Material for Your Casting Application – A356, 319, 355, 713, 535 Almag
Why Alloy Selection Matters
Selecting the right aluminum alloy is one of the more important decisions in the casting design process. The alloy you choose affects strength, corrosion resistance, machinability and overall manufacturing cost.
Key Factors to Consider
When selecting an aluminum casting alloy, consider:
- Mechanical strength
- Corrosion resistance
- Machinability
- Operating environment
- Cost
Balancing these requirements early in the design process helps optimize both performance and manufacturability.
Common Aluminum Casting Alloys
A356: The Most Versatile Choice
A356 is one of the most widely used aluminum casting alloys due to its excellent balance of strength, corrosion resistance, castability and machinability.
Common Applications:
- Industrial equipment castings
- Structural castings
- Decorative castings
- Automotive component castings
- Electrical component castings
319: A Cost-Effective Solution
319 aluminum offers good strength and excellent machinability at a lower material cost, making it a popular choice for low to high volume industrial applications.
Common Applications:
- Engine components
- Gear cases
- Compressor housings
- Decorative castings
355: Higher Strength for Demanding Applications
When applications require greater mechanical properties, 355 aluminum provides higher tensile and yield strength than A356.
Common Applications:
- Structural castings
- Heavy-duty industrial equipment
- Transportation applications
713: Ideal for Pressure-Tight Castings
713 aluminum is known for its excellent pressure tightness and corrosion resistance, making it a preferred choice for fluid-handling applications.
Common Applications:
- Pump housings
- Valve bodies
- Hydraulic components
535: Superior Corrosion Resistance
For harsh environments, 535 aluminum offers outstanding resistance to corrosion, particularly in marine and outdoor applications.
Common Applications:
- Marine equipment
- Outdoor industrial components
- Transportation equipment
Quick Alloy Comparison
| Alloy | Key Advantage | Typical Use |
| A356 | Balanced performance | General industrial applications |
| 319 | Cost-effective and machinable | Engine and industrial components |
| 355 | Higher strength | Structural applications |
| 713 | Pressure tightness | Pumps and valves |
| 535 | Corrosion resistance | Marine and outdoor equipment |
Why Early Collaboration Matters
Selecting the right alloy involves more than reviewing material property charts. An experienced casting and machining partner can help evaluate performance requirements, manufacturing considerations, and cost objectives to identify the best solution for your application.
Final Thoughts
The right aluminum alloy can improve product performance, simplify manufacturing and reduce overall costs.
Whether your priority is strength, corrosion resistance, pressure tightness or machinability, understanding the differences between A356, 319, 355, 713, and 535 alloys can help ensure long-term success and cost savings for your casting project.
If you’re developing a new aluminum casting, give us a call at Cast Metals Technology. We are happy to help you select the most effective alloy for both performance and production goals.