Do you provide heat treatment for aluminum cast parts?

6061 aluminum is a classic wrought aluminum alloy, not a casting alloy. Wrought alloys are shaped by rolling, extrusion, forging, or stamping — not pouring molten metal into molds. 6061 has excellent formability, machinability, and weldability but very poor castability. Casting-grade aluminum uses entirely different chemical compositions (high silicon) and is labeled separately (A356, ADC12, etc.).

Yes, aluminum is one of the most widely used metals for casting globally. Its low melting point (660°C), light weight, good fluidity, and recyclability make it ideal for casting. Aluminum casting accounts for over 25% of global non-ferrous casting output. It is used in automotive parts, electronics housings, engine components, heat sinks, lighting, and industrial machinery. Casting processes include high-pressure die casting, gravity casting, sand casting, and low-pressure casting.

It depends entirely on the application — they serve different purposes.
6061 Aluminum
- Medium strength, good corrosion resistance, excellent weldability and machinability
- T6 tensile strength: 310 MPa / 276 MPa yield
- Cost-effective, versatile
- Best for structural frames, brackets, tubes, machining parts
7075 Aluminum
- Ultra-high strength (572 MPa tensile, T6), top-tier aluminum alloy
- Poor corrosion resistance, not weldable
- Used in aerospace, high-stress components, aircraft parts
Summary: For general engineering, machining, welding, cost: 6061 is better; For maximum strength, aerospace, high load: 7075 is better. Neither is designed for casting.

An aluminum casting alloy is a specially formulated aluminum-based material optimized for molten casting processes. Key characteristics include:
- High silicon content (typically 5–13%) to improve melt fluidity
- Low shrinkage and reduced porosity
- Good mold-filling ability
- Stable casting performance at 660–720°C
- Balanced strength, ductility, and machinability
Common standard casting alloys: ADC10, ADC12, A356, A357, A380, AlSi9Cu3, AlSi12. These are completely different from wrought alloys like 6061 and 7075.

Aluminum alloys can be both cast and forged, depending on the alloy grade and manufacturing process.
- Cast aluminum alloys: Designed for casting processes; high silicon content for fluidity; examples: ADC12, A356, A380. Advantages: complex shapes, low tooling cost, mass production.
- Wrought aluminum alloys: Used for forging, extrusion, rolling; examples: 6061, 7075, 5052, 6063. Forged aluminum has higher density, better fatigue resistance, and tighter tolerances.
In short: Casting = shape complexity & cost efficiency; Forging = higher strength & structural integrity.

7075 aluminum is a high-strength wrought alloy (Al-Zn-Mg-Cu) and is NOT a casting alloy. It cannot be effectively cast due to: high hot-cracking tendency, extremely low casting fluidity, and severe internal porosity and segregation. Casting 7075 leads to unusable parts with defect rates >50% and unpredictable mechanical performance. When people refer to “7075 cast,” it usually refers to a misunderstanding or mislabeling. Genuine 7075 is only produced by rolling, extrusion, or forging —never casting.