7075 Aluminum Coils

How many times stronger is 7075 aluminum coil compared to ordinary aluminum?

Compared to 3003 rust-resistant aluminum (hard state approx. 180MPa): Strength approximately 3.17 times.

Compared to 1060/1100 pure aluminum (soft state approx. 90MPa): Strength approximately 6.33 times.

In summary, for conventional engineering insulation aluminum coils, 7075 has an overall strength 3-6 times that of ordinary aluminum, with significantly superior hardness, deformation resistance, and load-bearing capacity, classifying it as an ultra-high-strength aerospace-grade aluminum material.

Do the tensile strength and yield strength of 7075 aluminum coil change with temperature?

Conclusion: Yes, they change significantly. The higher the temperature, the lower both tensile and yield strength.

I. Standard Values at Room Temperature (25℃)

Yield Strength: ≈505MPa

Tensile Strength: ≈570MPa

II. Temperature Change Pattern

Below 100℃: Strength decreases slightly, with minimal impact on structural use.

150℃~200℃: Strength declines significantly, with yield and tensile strength decreasing by 25%~40%.

Above 250℃: Strength decreases drastically, losing high-strength load-bearing capacity and becoming highly susceptible to deformation.

After cooling from high temperature: Strength cannot fully recover, resulting in permanent mechanical property degradation.

III. Low Temperature Environment

In sub-zero temperatures: Tensile and yield strength increase slightly, toughness decreases slightly, less prone to brittleness, and exhibits good stability under low-temperature conditions.

IV. Practical Summary

7075 is a high-strength aluminum with moderate heat resistance. Prolonged high-temperature operation is strictly prohibited. It is only suitable for room and low-temperature use and not for high-temperature load-bearing structures.