EN AW-7075 vs EN AW-5083: Fundamentally different alloy families — strength vs corrosion/weldability
EN AW-7075 vs EN AW-5083
Side-by-side chemical composition and mechanical property comparison.
Overview
EN AW-7075
3.4365
THE aerospace aluminum — Al-Zn5.6-Mg-Cu precipitation-hardened to the highest strength of any common aluminum alloy. T6 strength rivaling mild steel at 1/3 the density. Poor weldability and corrosion resistance vs 5xxx/6xxx. Used for aircraft wing skins, fuselage frames, high-stress structural components, and competitive cycling/climbing equipment. Often Alclad for corrosion protection.
EN AW-5083
3.3547
The highest-strength non-heat-treatable aluminum alloy. Al-Mg4.5-Mn with outstanding seawater and industrial chemical resistance. Retains exceptional strength after welding (unlike 6xxx/7xxx). ASTM B928 certified for marine service. THE shipbuilding aluminum — also used for rail cars, pressure vessels, cryogenic tanks, truck bodies, and LNG applications. Available O, H111, H116, H321 tempers.
| EN AW-7075 | EN AW-5083 | |
|---|---|---|
| Material Number | 3.4365 | 3.3547 |
| Category | Aluminum | Aluminum |
| Standard | EN 485-2 | EN 485-2 |
Chemical composition (wt%)
| Element | EN AW-7075 | EN AW-5083 | Overlap |
|---|---|---|---|
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0–0.3% | 0.4–1% | No overlap |
| Cr | 0.18–0.28% | 0.05–0.25% | Partial |
| Cu | 1.2–2% | 0–0.1% | No overlap |
Mechanical properties
| Property | EN AW-7075 | EN AW-5083 | Unit |
|---|---|---|---|
| tensile_strength | 540–570 | 270–345 | MPa |
| yield_strength | 470–505 | 115–130 | MPa |
| elongation | 7–11 | ≥ 16 | % |
Compatibility Assessment
7075-T6 is 80% stronger (UTS 540 vs 305 MPa) but cannot be welded, has poor seawater resistance, and is much more expensive. 5083 is the marine/weldable workhorse. Choose 7075 for aerospace structural; 5083 for marine/welded/chemical.
Frequently Asked Questions
Is EN AW-7075 the same as EN AW-5083?
EN AW-7075 and EN AW-5083 have a 30% composition overlap. Fundamentally different alloy families — strength vs corrosion/weldability
Can I replace EN AW-7075 with EN AW-5083?
Generally not recommended. The compositions differ significantly (30% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between EN AW-7075 and EN AW-5083?
The main differences are in the following elements: Mn, Cr, Cu, Zn. EN AW-7075 is a Aluminum grade, while EN AW-5083 is a Aluminum grade.
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