7050
AVAILABLE NOWThick-section aerospace plate with superior stress corrosion resistance compared to 7075. The standard for aircraft structural components above 3 inches thick.
Overview
7050 is a zinc-copper-magnesium-zirconium alloy developed to solve a specific problem with 7075: stress corrosion cracking in thick plate. When 7075 is quenched during heat treatment, the interior of thick sections cools more slowly than the surface. This slower quench produces reduced mechanical properties in the center of the plate and leaves the thick section more vulnerable to SCC. 7050's chemistry — specifically the addition of zirconium and adjusted copper-to-zinc ratio — produces an alloy that is less sensitive to quench rate variation, maintaining consistent properties and SCC resistance even in sections above 3 inches.
T7451 is the primary plate temper and the one specified in AMS 4050. The T7451 designation indicates the plate was solution heat-treated, stress-relief stretched, and overaged to the T73-equivalent corrosion resistance level. The overaging reduces tensile strength by roughly 5 to 10 percent compared to 7075-T651 in equivalent thickness, but the SCC resistance improvement is substantial. For programs where SCC is a formal design requirement, 7050-T7451 is the standard answer. T7651 adds a clad surface layer for added surface corrosion protection in specific applications.
7050 is used wherever the combination of high strength, thick-section uniformity, and SCC resistance is required in a single plate. Large aircraft structural components — wing center sections, fuselage frames, bulkheads — are the primary application. The alloy is also used in defense structural hardware and large-section machined aerospace components where 7075 would present unacceptable SCC risk.
Tempers Available
T7451 (AMS 4050) — best SCC resistance
T7651 (AMS 4201) — maximum strength
Material Origin
Available Forms
Plate
0.25" through 6" thick. Standard widths 48" and 60", standard lengths 96" and 144".
Custom Cut
Plate cut to your rectangle dimensions. Heavy section bandsaw capability.
Mechanical Properties
| Temper / Condition | Tensile (min) | Yield (min) | Elongation (min) | Hardness |
|---|---|---|---|---|
| T7451 (0.25" to 0.5" thick) | 72,000 psi min | 61,000 psi min | 9% min | Brinell 140 (typical) |
| T7451 (0.5" to 2" thick) | 72,000 psi min | 60,000 psi min | 8% min | — |
| T7451 (2" to 4" thick) Properties highly consistent through thickness vs 7075 at equivalent section | 70,000 psi min | 57,000 psi min | 8% min | — |
| T7451 (4" to 6" thick) | 68,000 psi min | 55,000 psi min | 7% min | — |
Values are minimums per applicable specification unless noted as typical. Properties may vary by thickness, temper, and mill. Always verify against the applicable AMS or ASTM specification for your program.
Physical Properties
Specifications & Standards
AMS Specifications
ASTM / MIL Specifications
Machining Notes
Common Applications
7050-T7451 is the correct choice when section thickness exceeds 3 inches, when SCC resistance is a formal design requirement, or when the program specification calls out AMS 4050 directly. For thinner sections without SCC requirements, 7075-T651 is typically the more cost-effective option.
Why NOX for 7050
Related Materials
Related Materials
6061 Aluminum
The standard general-purpose structural alloy. Good machinability, weldability, and corrosion resistance across a wide range of applications.
7075 Aluminum
High-strength aerospace alloy. Among the highest tensile strength available in commercial aluminum at 73,000 psi minimum in T651.
5000 Series Aluminum
Marine-grade corrosion-resistant wrought plate. 5052, 5083, and 5086 in standard and heavy gauge, up to 40" thick for structural applications.
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