At 6:44 PM -0800 12/8/97, I wrote:
>Well, at last my CM mast arrived (just in time for the first winter snow
>that will probably postpone installation until spring).
>
>I have never purchased one of these wonderous products before and it came
>with a signed and sealed Material Test Report that tells me all sorts of
>wonderful things, perhaps 5% of which I understand.
>
>Perhaps there is a bored materials engineer out there that can deciper some
>of this for me:
>
>Heat Number: 956741
>Grade: 4130
>Dimensions: 2" OD, 1.25" ID (Wall 0.375")
>ASTM Spec: A519
>Description: SMLS * CD * ALLOY STEEL TUBE
>Chemical Analysis:
> C: 0.29
> Mn: 0.44
> P: 0.015
> S: 0.003
> Si: 0.24
> Cu: 0.21
> Ni: 0.12
> Cr: 0.97
> Mo: 0.018
> Al: 0.026
> Ca: 0.002
>Yield Strength: (PSI) 125,700
>Tensile Strength: (PSI) 143,000
>Elongation: % in 2" 32.5
>ROA: 57.3
>Hardness: (BHN) 321
>
>What say you, engineers? Is this the wonderful stuff that multiple
>Towertalk threads have been devoted to?! :)
Well, no one has lept forward to explain what all of those neat numbers
mean, but I've had several folks ask where I obtained the mast. For info
on that, contact Tom K5RC/7 at tomk5rc@aol.com.
73, Dick
--
Dick Flanagan W6OLD CFII Minden, Nevada DM09 (South of Reno)
Visit http://www.qsl.net/w7di/
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