7021 T6 aluminum alloy belongs to the Al-Zn-Mg based 7000 series and offers a balance of high strength, good corrosion resistance, and weldability. It has a similar chemical composition to 7020 but can provide slightly higher strength and more balanced mechanical performance in certain applications. The T6 temper refers to solution heat treatment and artificial aging, providing maximum strength.

In terms of corrosion resistance, 7021 T6 performs well within the 7000 series. Its resistance to stress corrosion cracking (SCC) is lower than overaged tempers such as T7351, but it provides a more balanced corrosion behavior compared to 7075-T6. Compared to 6000 series alloys, its corrosion resistance may be slightly lower, so protective coatings are recommended in aggressive environments.

Regarding strength and mechanical properties, 7021 T6 offers high strength and clearly exceeds 6082-T6. However, it remains below higher strength alloys such as 7075 and 7010. In return, it provides better toughness and impact resistance, resulting in a more balanced performance. Compared to 2024 alloy, it offers advantages in both strength and corrosion resistance.

In terms of machinability, bendability, and weldability, 7021 T6 provides moderate machinability. Machining is possible but not as efficient as 7012 or 7075. Its weldability is relatively good for a 7000 series alloy and can be applied using MIG and TIG methods. Its bending capability is lower than in T4 temper, and forming operations are typically performed before heat treatment.

Regarding coating ability, vibration behavior, and applications, 7021 alloy is suitable for anodizing and protective coatings. Its decorative surface quality is moderate. Its vibration damping capacity is relatively better than typical 7000 series alloys. Main application areas include automotive, railway systems, machinery manufacturing, defense industry, and welded structures. 7021 T6 is suitable for applications requiring both high strength and good weldability.

MATERIAL COMPOSITION STANDARDS

7021 T6 is available according to the following standards:
• 7021 T6 Plate; ISO AlZn5.5Mg1.5, UNS A97021, ASTM B209
 

Characteristic Properties of 7021 T6: 

• Strength: High
• Machinability: Very Good
• Weldability: Low
• Formability: Poor
• Corrosion Resistance: Average
• Heat Treatment: Yes
   

Some Well-Known Applications of 7021 T6: 
In plastic injection molds,
In food processing machinery,
Also used in defense industry and robotic parts.
 

STOCK
We supply 7021 T6 in sheet form.

• Sheet/Plate