Letter 30089

Sheet metal identification numbers [Delaware] 

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Could you please tell me exactly what the indentification numbers on sheet metal mean? For instance, the 2024-T3...that I am seeing. Are these common indentification numbers? Also, is there a difference between the identification numbers on sheet metal and other metals such as 18/8 stainless that would be used in a bowl or platter. I work for the USAF Reserves in Dover, DE. Just inquiring.

Thank you.

James Ferguson
Sheet Metal Mechanic - Aberdeen, MD, USA

I can't say that such numbers always indicate the type of metal, but the two examples you provided do. 2024-T3 means aluminum of type 2024 with a T-3 temper. Aluminums in the 2xxx series are aluminum-copper alloys, and 2024 is one specific composition. T-3 means solution heat treated and cold worked. 18/8 stainless means stainless steel comprised of 18 percent chromium and 8 percent nickel.

There are numerous numbering systems for various metals, and unfortunately there are few easily discernible patterns.

 
Ted Mooney, P.E.
finishing.com Inc. - Brick, NJ

The numbers stamped on to the back of metals are there to help identify the type of metal and alloy that makes up that particular sheet of metal. For example the 2024 the 2000 series is aluminum the numbers that follow the 20 is the other metals that are present in that compound for example 24 is magnesium. Very rarely are you to find a metal that is 100% pure because for one they rarley exsist in nature and two if they do they are to rare to be used for common sheet metal that me or you could afford. Secondly the T-? whatever the number 1,2,3 whatever it may be is the temprent effect and mechanical properties of that metal. For common household or automotive applications these numbers don't mean a whole lot but when you get in to aircraft or other high speed applications such things become very important.

Brian Z
- Oceanside, CA

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