help identifying aluminum alloy

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blockmanjohn

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I bought this piece of 1/2" aluminum plate on eBay. It has this pattern on one side, and the other side seems to be just a mill finish. Does anyone know what this pattern means? Thanks, John.
 

mayhugh1

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View attachment 114257 I bought this piece of 1/2" aluminum plate on eBay. It has this pattern on one side, and the other side seems to be just a mill finish. Does anyone know what this pattern means? Thanks, John.
Are you sure it's not a peel-off protective piece of plastic? - Terry
 

blockmanjohn

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It is not a peel-off piece of plastic. The pattern also has a very noticeable texture to it.
 

doc1955

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To me it looks as if someone pealed off the protective coating then put it back down and left it to corrode.
 

chrsbrbnk

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thats how it looks if you leave the plastic cover on to long like a decade or two the aluminium gets stained like that get the sticky off with a solvent then buff with a random orbit and some scotch brite
 

blockmanjohn

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Upon further scrutiny I think that is exactly what happened. Thanks for the replys, John.
 
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chrsbrbnk

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were you able to identify the alloy? some aluminium alloys machine poorly
 

blockmanjohn

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It machined very well, but I have no idea how to identify the particular alloy.
 

Deholby

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first guest is K1oo Cast tooling plate.
Its one of the plates that alway have a plastic sheet on it to protect the finish.

Is the chip a dull looking when cutting? Its also a little on the gummy side cutting too.

If its Cast plate, is soft and tension is only about 3200 psi, where 6061 t6 is 45000 psi
 

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