Alloy System and Strength
6063 is an aluminum-magnesium-silicon alloy that can be heat-treated and strengthened to medium strength, with high impact toughness and good thermoplasticity. It can be extruded at high speed into complex, thin-walled, and hollow profiles or forged into complex forgings, making it the standard alloy for architectural and industrial extrusion.
Quenching Characteristics
The alloy has a wide quenching temperature range and low quenching sensitivity. As long as the temperature is above the quenching temperature after extrusion and forging demolding, the section can be quenched by water spraying or water immersion, simplifying inline solution treatment in continuous extrusion lines.
Welding and Corrosion Performance
6063 has excellent welding performance and corrosion resistance, with no stress corrosion cracking tendency in the heat-treatable strengthening alloy family. Among the Al-Mg-Si alloys, 6063 is one of the alloys for which stress corrosion cracking has not been observed, supporting reliable welded and assembled structures in outdoor service.
Surface Quality and Anodizing
The processed surface is very smooth, and the alloy is easy to anodize and color, producing bright, uniform finishes for architectural and decorative use. A notable limitation is the parking effect: if quenched material is held at room temperature for a period before aging, the final strength is negatively affected, so aging timing must be managed in production.
Typical Applications
6063 is used for building doors, windows, and curtain wall frames, automotive parts, radiator and heat transfer components, electronic housings, furniture, and decorative profiles. The T5 and T6 tempers serve different strength and finish requirements.
Frequently Asked Questions
Q: What alloy system is 6063?
A: Al-Mg-Si, heat treatable to medium strength.
Q: Why is 6063 good for extrusion?
A: High-speed extrudability into complex, thin-walled, and hollow sections with a wide quenching range.
Q: Does 6063 resist stress corrosion?
A: Yes, no stress corrosion cracking tendency has been observed in 6063.
Q: What is the parking effect?
A: Holding quenched material at room temperature before aging reduces the final strength.
Q: What surface treatments suit 6063?
A: Anodizing and coloring, giving smooth, uniform finishes.
Q: Where is 6063 used?
A: Architectural frames, automotive parts, heat transfer components, and decorative profiles.
For 6063 alloy quotations in profile, tube, and bar forms, contact our sales team.