7020 T4 aluminum alloy belongs to the Al-Zn-Mg based 7000 series and is developed for applications requiring good weldability along with high ductility. The T4 temper refers to solution heat treatment and natural aging, providing high formability while offering lower strength compared to T6 and T7 tempers. Due to its low copper content, 7020 stands out within the 7000 series for welded structures.

In terms of corrosion resistance, 7020 T4 provides quite good performance and is among the more corrosion-resistant alloys within the 7000 series. Its resistance to stress corrosion cracking (SCC) is higher than that of T6 tempers. It can also exhibit corrosion resistance close to that of the 6000 series in atmospheric conditions and offers better general corrosion behavior than alloys like 7010 or 7075.

Regarding strength and mechanical properties, 7020 T4 has lower strength compared to overaged tempers such as T7351. However, this is compensated by higher ductility and impact resistance. Compared to 6082-T6, its strength level may be similar or slightly lower, but it provides better formability. Compared to 2024, it offers better corrosion resistance and a more balanced mechanical performance.

In terms of machinability, bendability, and weldability, 7020 T4 is highly advantageous. Its bendability and formability are high, allowing the production of complex geometries. Its weldability is very good and it can be easily joined using MIG and TIG methods. Its machinability is moderate and not as high as 7012 or 7075.

Regarding coating ability, vibration behavior, and applications, 7020 alloy is suitable for anodizing and surface coating processes. Its decorative surface quality is moderate. Its vibration damping capacity is relatively better than other 7000 series alloys. Main application areas include railway systems, automotive structures, welded chassis and constructions, and defense industry. 7020 T4 is an ideal alloy especially for applications involving extensive forming and welding operations.

MATERIAL COMPOSITION STANDARDS

7020 T4 can be produced according to the following standards:
• 7020 T4 Extrusion Round Bar; ISO AlZn4.5Mg1, WNR 3.4335, UNS A97020, ASTM B221, BS H17
• 7020 T4 Extrusion Flat Bar; ISO AlZn4.5Mg1, WNR 3.4335, UNS A97020, ASTM B221, BS H17
• 7020 T4 Extrusion Wire; ISO AlZn4.5Mg1, WNR 3.4335, UNS A97020, ASTM B221, BS H17
• 7020 T4 Extrusion Tube; ISO AlZn4.5Mg1, WNR 3.4335, UNS A97020, ASTM B221, BS H17
• 7020 T4 Sheet; ISO AlZn4.5Mg1, WNR 3.4335, UNS A97020, ASTM B209, BS H17
 

Characteristic Properties of 7020 T4: 

• Strength: High
• Machinability: Moderate-High
• Weldability: Moderate
• Formability: Reasonable
• Corrosion Resistance: Good
• Heat Treatment: Yes
   

Some Well-Known Applications of 7020 T4: 
Primarily in the aerospace industry,
In the structure of high-speed trains,
Used in heat exchangers.
 

STOCK
7020 T4; we manufacture/supply in sheet, bar/flat, and tube/profile forms.

• Sheet
• Bar/Flat
• Tube/Profile