5083 Alloy

This material offers the highest strength of all non heat treatable aluminium alloys and is used by many military and commercial vessels.


The entire hull structure, including keel and support frames, of the Morningstar series of boats are made with marine grade 5083 alloy. Many similar sized boats on the market today uses the 5052 alloy. While 5052 is easier to form, 5083 offers roughly 50% higher tensile and yield strengths. (Based on mill data: [1])


Tensile strength is the maximum stress that a material can withstand while being stretched or pulled before necking.


Yield strength is the stress at which a material begins to deform plastically. Once the yield point is passed, some fraction of the deformation will be permanent and non-reversible.


Practically speaking, this means the same boat made with 5083 can withstand greater stress in a collison before cracking or deforming, than a boat made with steel, fibreglass or aluminium 5052 alloy.


5083 also has excellent weldability. According to ESAB (a major manufacturer of welding equipments), compared to the respective base alloy, the as-welded 5083 alloy loses only 7% of its tensile strength, while welded 5052 is between 19% to 36% weaker. [2] Heat treatable alloys such as 6061, can have a loss of strength of around 80% near welds. [3]


With our over 20 years of experience in the field of metal forming and significant investment in capital equipment, we have the capacity to handle materials that may be unwieldly for smaller or less experienced manufacturers.


DNV(Det Norske Veritas) certification of the aluminium plates we use for the hull structure is available upon request.


Reference: (external links)

[1] SheetandPlate (

[2] How does welding affect the HAZ of the weld (

[3] 6061 aluminium alloy (

Copyright © Cadcam Marine Pty. Ltd. All Rights Reserved.