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[TowerTalk] ChromeMoly Mast Specs

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Subject: [TowerTalk] ChromeMoly Mast Specs
From: (Dick Flanagan)
Date: Thu, 11 Dec 1997 08:44:05 -0800
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

73, Dick

Dick Flanagan W6OLD CFII Minden, Nevada DM09 (South of Reno)

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