Date: Fri, 8 Apr 2016 07:47:44 -0700
From: "Jim Thomson" <jim.thom@telus.net>
To: <towertalk@contesting.com>
Subject: [TowerTalk] 2 inch Chrome Moly mast needed
## watch out with the 1026 DOM that?s available at some steel suppliers,
esp the franchised metal super marts etc. The yield strength varies
a bit. I have seen as low as 75 ksi..and as high as 87 ksi . Others have
seen
an even wider variation in extremes. Some of the galvanizing jobs that hams
have had
done turn out pretty good, and some are not so good. Array solutions stuffs
a TV camera
down the inside to check the inside galvanizing job. Same setup as what
plumbers use.
Jim VE7RF
@@@@ ditto with 4130 chromolly steel. UN heat treated, its only 70 ksi.
When you see dirt cheap 4130 CM steel at a steel yard, that’s why.
@@@ The heat treating process is typ done at 1350 F. The galvanizing process
is typ done at 875-900 F. The galvanizing process will not screw up the
prior heat treating
process.
Jim VE7RF
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|