in aluminum alloy designations the first number is the alloy composition number
which can be looked up in a table to get the various percentages of elements in
the alloy. the 'T' number is the heat treatment designation. that can be
looked up to tell you what type of heat treatment the material has had. the
heat treatment affects how the grains in the material are arranged, this can
affect strength and hardness of the final material. working after heat
treatment as in drawing tubing or bending carribeaners or machining can further
affect the characteristics of the final product.
Greg Gobleman wrote:
>
> I don't know about using 7075-T6 as a mast but you did ask about
> other uses. Something very similar, 7075-T9 is used as a popular
> and tough arrow shaft. What I don't know is, what the T6 or T9
> designation means. In manufacturing arrows they start with a
> larger size tube and draw it down over many steps.
>
--
David Robbins K1TTT
e-mail: mailto://k1ttt@berkshire.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net
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