EN AW-7020-T6: Weldable High-Strength Aluminum for Military and Rail
EN 755-2 · Published: 2026-06-03 · Updated: July 2026
EN AW-7020-T6 is a medium-strength weldable Al-Zn-Mg alloy — the strongest aluminum that can be fusion welded without filler metal dilution issues that plague 7075 welding. It is used for military bridge structures, armored vehicle hulls, and...
EN AW-7020-T6 is a medium-strength weldable Al-Zn-Mg alloy — the strongest aluminum that can be fusion welded without filler metal dilution issues that plague 7075 welding. It is used for military bridge structures, armored vehicle hulls, and rail vehicle bodies where the weld joint must achieve strength approaching the base metal.
Quick Facts
| Category | Aluminum Alloy |
| Standard | EN 755-2 |
| Density | 2.78 g/cm³ |
| Yield Strength | 290 MPa |
| Tensile Strength | 350 MPa |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
Can 7075 be welded the same way as 7020?
No. 7075 contains copper and is considered unweldable by fusion processes — the heat-affected zone becomes susceptible to stress corrosion cracking and liquation cracking. 7020 was specifically developed to eliminate copper and manage the Zn:Mg ratio for weldability while retaining strength. This is why 7020 is specified for welded military structures.
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