As much as I'd
like to call going from 7071 to 356 an upgrade
the heat-treated specs on the 2 were similar. iirc..
Since we're talking alloys..
Trucks that say weapons grade or aircraft aluminum are probably 7075 (and maybe 7175?). That's a popular alloy and close to 7071. Their main (I forget correct the word) ingredient is zinc. Pretty sure that's the entire 7000 series.
Both have similar amounts of magnesium, but 7075 also gets a good amount of copper too.
All that stuff should make them grind better. Probably wear down a lil faster cuz of that too (as ppl are confirming?). Might be why they feel soft? But I think (Brindell?) hardness was the same or close. Heat-treated..
I've got an interesting thing in my notes for 7071, 0.25% Ti max. Theeve?
356 has silicon as the main ingredient and about the same amount copper as 7071. And could have a similar, tiny amount of magnesium. It's like traces levels..
A356 is a more pure form of 356.
They're all ~90% aluminum so I think densities are similar.
Virgin means no recycled cans.
Most (all?) heat-treat is T4?
I'll try dig up some links and add them here.
https://books.google.com/books?id=g-aUf3nM6AEC&pg=PT111 7071 and 7075 %'s
If you scroll way up you can see 356
http://www.matweb.com/search/QuickText.aspx?SearchText=707Doesn't show 7071 T4 but you can compare strength to 356 if you matches the rating, T6 to T6, etc.
http://www.matweb.com/search/QuickText.aspx?SearchText=356http://www.matweb.com/search/QuickText.aspx?SearchText=7075No info on 3056 alloy
3xxx is Nickel-chromium steel
4xxx is Molybdenum steel (chromoly)
http://www.matweb.com/search/QuickText.aspx?SearchText=4140