7075 Aluminum Alloy

Lead-freeAA 7075 7075 Composition Alloy Production and Research Among the Highest-Strength Aluminum Alloys Remelt Ingot Form

High-strength aluminum-zinc-magnesium-copper alloy in remelt ingot form for alloy production, research melts, and specialty castings.

Solidus

890°F (477°C)

Liquidus

1,175°F (635°C)

Density

0.102 lbs/in³ (2.81 g/cm³)

Primary Elements

Zn, Al, Cu, Mg

Nominal Composition

0.05% Zr, 0.2% Ti, 0.23% Cr, 0.4% Si, 0.5% Fe, 1.6% Cu, 2.5% Mg, 5.6% Zn, Bal. Al

Request a Quote

Custom request

Can't find the right composition?

Get Expert Help

Product Overview

7075 Aluminum Alloy is one of the highest-strength aluminum alloys, with a nominal composition of 5.6% Zn, 2.5% Mg, 1.6% Cu, and 0.23% Cr. It has a melting range of roughly 890–1,175°F (477–635°C) and a density of 0.102 lbs/in³ (2.81 g/cm³). 7075 is best known as a wrought alloy for aircraft structures, firearms, and high-performance sporting equipment.

This product is supplied as 3-16 remelt ingot to the 7075 composition. It is used to produce 7075 alloy for further processing, for research and development melts, for testing and qualification work, and by foundries producing specialty castings to 7075 chemistry. Because of its wide freezing range, 7075 is more prone to hot cracking in castings than standard casting alloys, so casting design and practice must account for this.

Supplied as 3-16 ingot.

Available Forms

3-16 Ingot

Product Code

18917

Technical Info

Thermal Properties

Melting Point (Solidus)890°F (477°C)

Melting Point (Liquidus)1,175°F (635°C)

Physical Properties

Density (imperial)0.102 lbs/in³

Density (metric)2.81 g/cm³

Primary ElementsZn, Al, Cu, Mg

SpecificationAA 7075

Lead FreeYes

Key Features

7075 CompositionAlloy Production and ResearchAmong the Highest-Strength Aluminum AlloysRemelt Ingot Form

Solubility Note

Melt under a protective flux, zinc and magnesium oxidize readily, so minimize holding time and overheating.

Nominal Composition

5.6% Zn
2.5% Mg
1.6% Cu
0.5% Fe
0.4% Si
0.23% Cr
0.2% Ti
0.05% Zr
Bal. Al

Yes, but with care. 7075 has a wide freezing range and is prone to hot cracking, so it is more difficult to cast than alloys designed for casting such as A356. It is used for specialty castings where its chemistry is required, and as remelt stock for producing 7075 for further processing.

Its zinc, magnesium, and copper form fine precipitates during heat treatment that strongly resist deformation. In the fully heat-treated (T6) wrought condition, 7075 reaches strength levels comparable to many steels at about one-third the weight.

Melt under a cover flux and avoid overheating, since zinc and magnesium oxidize and can be lost from the melt. Check chemistry before pouring and adjust zinc and magnesium if needed.