DMcCam wrote:Hi Gents,
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We did use anodized aluminum (2024 Ted?).
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Ahh?, yours is anodized. If it's anodized I think it's categorized as 5005-H34, not 2024.
The four number designation is a standard given to the alloy. Each number helps identify the properties of the metal.
NON-HEAT-TREATABLE (COMMON) ALLOYS
1100
This is commercially pure aluminum (99% minimum). It has excellent corrosion resistance, weldability, and workability, as well as high thermal conductivity.
5005
This alloy is very similar in properties to 1100 and 3003, and is preferred where anodizing is required. All of ASCO's pre-finished anodized sheets are 5005-H34. It matches architectural alloy 6063 when anodized.
(There are many other variations in this category)
HEAT-TREATABLE (STRONG) ALLOYS
2024
While limited in formability and workability, this alloy has high tensile strength – in the 30 to 63 KSI range. It is used in high-strength structural and aircraft applications.
(There are many other variations in this category)
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Hope that helps.

Ted