Aluminium 6351 Data Sheet

6351 Overview

6351 is a heat treatable high strength alloy with excellent corrosion resistance and excellent weldability with a structural surface finish. The higher strength of 6351 is ideal for structural applications particularly in marine, defence and transport.

Common Applications

6351, and similarly 6082, has moderate extrudability suitable for high stress applications including recreational trailers, marine, boats, truck bodies, automotive componentry, food production equipment, bridges, cranes, trusses, defence, rail and civil structural supports.

Welding

6351 has excellent weldability by all standard methods including GMAW (MIG) and GTAW (TIG). Filler alloy 4043 is the primary filler though 5356 wire is the suggested alternative.

Machining

Machinability of 6351 is good in T5 and T6 tempers.

Similar Products

Structural alloys 6005A and 6061 are alternatives to 6351 with slightly lower mechanical properties and improved surface finish aesthetics.

Chemical Composition Specification (%) Single values are maxima except as noted
Alloy Si Fe Cu Mn Mg Cr Zn Ti Other
Each Total
6005A 0.5-0.9 0.35 0.30 0.50 0.4-0.7 0.30 0.20 0.10 0.05 0.15
6061 0.4-0.8 0.70 0.15-0.4 0.15 0.8-1.2 0.04-0.35 0.25 0.15 0.05 0.15
6351 0.7-1.3 0.5 0.10 0.4-0.8 0.4-0.8 – 0.20 0.20 0.05 0.15
6082 0.7-1.3 0.5 0.10 0.4-1.0 0.6-1.2 0.25 0.20 0.10 0.05 0.15

Mechanical Property Specification – Single values are maxima except as noted
Alloy and Temper Thickness mm Tensile Strength Elongation (% min in 50mm)
Over Up to Ultimate Yield
Min Max Min Max
6005A T5 All thicknesses 260 – 240 – 8
6061 T5 3mm 6mm 235 – 210 – 8
6061 T6 All thicknesses 260 – 240 – 8
6351 T4 <150mm 185 – 115 – 16
6351 T5 All thicknesses 260 – 240 – 8
6351 T6 <150mm 295 – 255 – 8
6082 T5 <6mm 270 – 230 – 8
6082 T6 <20mm 295 – 255 – 7

Standards Referenced

AS/NZS 1866:1997 Reconfirmed 2020 – Aluminium and aluminium alloys – Extruded rod, bar, solid and hollow shapes AS/NZS 1665:2004 – Welding of aluminium structures

AAC (Australian Aluminium Council) publication – “Aluminium Standards Data and Design, Wrought products”.

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