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Si Mn st75 ???

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emonje

emonje

Mechanical
Joined
Nov 3, 2006
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48
Location
AU
I've got to work with old drawing calling for "Si Mn st75" as material (steel, most probably) required. I have no idea what it is. Can please anyone help?
 
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my guess is 7075 ... it used to be called 75ST,

but the Si-Mn might mean 6061
 
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