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The difference between 6061 and 7075 aluminum sheet

Last Updated: 2018-06-05

I. Introdsuction to 6061:

6061 in 6000 series aluminum, the main components are magnesium and silicon, accounting for a low proportion of the total composition. Aluminum strength is less than 7005. But because the alloy composition is simple, low content, and easy to weld and press, so the price is cheap.
The main alloying elements in 6061 alloy are magnesium and silicon, which have moderate strength, good corrosion resistance, weldability, and good oxidation effect. It is widely used in all kinds of industrial structures requiring certain strength and high antibiotic resistance.
6061 is the most common aluminum, with light weight, strength, and economic benefits.

Ⅱ. 7075 introdsuctions:

7075 is the lightest and strongest aluminum, and it’s super expensive! The 7075 is strong as steel.

7075 aluminum sheet is a high-strength cold working forged alloy, far superior to low carbon steel. 7075 is one of the strongest alloys commercially available. General corrosion resistance, good mechanical properties, and anodic reaction. Fine grains make deep drilling performance better, tool wear resistance enhanced, and wires rolling is different from weight.

The high-end 7075 aluminum sheet belongs to Al-Zn-MG-Cu superior aluminum. 7075 alloy is a kind of ultra-high strength deformation aluminum alloy, which has been used in aircraft manufacturing since the late 1940s and is still widely used in the aviation industry. It is characterized by good plasticity after solution treatment, excellent heat treatment strengthening effect, high strength below 150℃, and excellent strength at low temperatures. Poor welding performance; There is a tendency for stress corrosion cracking. It needs to be applied with an aluminum coating or other protective treatment. The stress corrosion cracking resistance of the alloy can be improved by double-stage aging.

According to China’s executive standard: GB/T 3880.2-2006, solid solution stability, good plasticity after treatment, has a particularly good heat treatment strengthening effect. The super strong 7075 is also known as steel.

Aluminum alloy 7075 aluminum alloy, zinc is the main alloying element. It is powerful, and comparable in strength to many sheets of steel, with good fatigue strength and general machining properties, but it is poorly resistant and more corrosive than many other aluminum alloys. Its relatively high cost limits its use. Cheap alloys are not suitable for the application.

The 7075 is also a 7000 series aluminum. It has the same composition as 7005, but is much higher in content and much harder than 6061. Beyond the hardness of steel. But because the alloy composition is many, the hardness is very high. So welding and pressing are difficult. The price is also much higher than 6061 and 7005.

6061 vs 7075 sheet

Ⅲ. 6061 and 7075 difference:

1. Differences in ingredients:

6061 aluminum alloy, aluminum alloy accounted for 97.9%, magnesium accounted for 1%, silicon accounted for 0.6%, but also added 0.28% copper and 0.2% chromium.

The composition of 7075 aluminum alloy roughly includes 5.6-6.1%, 2.1-2.5% zinc, 1.2-1.6% magnesium, copper, silicon, iron, manganese, titanium, chromium and other metals. It is usually prodsuced in several grades of thermal states, 7075-O, 7075-T6, and 7075-T651.

2. Hardness difference:

The hardness of 6061 is 90HB.

7075 hardness up to 150HB.

3. Series differences:

6061 in a 6000 series aluminum alloy.

7075 in 7000 series aluminum alloy, is zinc magnesium-aluminum alloy.

4. Different mechanical properties:

Yield, shear, and tension of aluminum alloys

Code (Yield)(Shear)(Tensile)

6065 7KSI 10KSI 13KSI

7075 15KSI 22KSI 33KSI

Aluminum alloy code: yield, shear, tensile.

6061 7KSI 10KSI 13KSI

7075 15KSI 22KSI 33KSI

6061 – T6 31 ksi 17 ksi 35 ksi

7075 – T6 73KSI 48KSI 83KSI

5. Differences in usage:

Because of the price, the 6061 can be used in a variety of places that do not need aluminum alloy materials, while the 7075 and 7005 are usually used in aerospace, high hardness, low density, and other commercial purposes. So 7075 is usually also a commercial aluminum alloy.

6. Price difference:

The 6061 aluminum sheet price is generally 30 yuan 18-1kg, and the price of 7075 is generally at 60 yuan 40-1kg. Therefore, the sales volume of 6061 is relatively high, while the sales volume of 7075 is less than that of 6061 because of the price.

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