Aluminum 7075-T7351: Stress-Relieved Aerospace Alloy for Thick Sections
AMS 4050 · Published: 2026-06-03 · Updated: July 2026
Aluminum 7075-T7351 is a special over-aged temper of the 7075 alloy designed to provide superior stress corrosion cracking (SCC) resistance in thick sections — at a 10-15% strength reduction vs the T651 temper. It is specified for aircraft...
Aluminum 7075-T7351 is a special over-aged temper of the 7075 alloy designed to provide superior stress corrosion cracking (SCC) resistance in thick sections — at a 10-15% strength reduction vs the T651 temper. It is specified for aircraft structural bulkheads, wing spars, and other thick-section components where SCC resistance is critical.
Quick Facts
| Category | Aluminum Alloy |
| Standard | AMS 4050 |
| Density | 2.81 g/cm³ |
| Yield Strength | 434 MPa |
| Tensile Strength | 503 MPa |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
Why choose T7351 over T651 for 7075?
T651 provides maximum strength (572 MPa ultimate) but is susceptible to stress corrosion cracking in the short-transverse direction for sections above 25mm. T7351 sacrifices ~10% strength to dramatically improve SCC resistance, making it the required temper for thick aerospace structural components.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu