The addition of nickel changes the crystal structure from body center
cubic to face centered cubic. That's why the 300 series are nonmagnetic
and can not be heat treated.
David
KW4DH
On 3/23/2011 12:10 PM, Al Kozakiewicz wrote:
> All stainless steels are ferrous and I would think that they'd thus all be
> subject to RF heating.
>
> The 300 series alloys have, in general, a higher percentage of chromium and
> nickel and are not magnetic. Some of the 400 series alloys have nearly as
> much but are magnetic. In either case, the Fe content is still around 70% or
> more.
>
> Al
> AB2ZY
>
> ________________________________________
> From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf Of
> Jim Tonne [Tonne@Comcast.Net]
> Sent: Tuesday, March 22, 2011 1:54 PM
> To: Rob Atkinson; amps@contesting.com
> Subject: Re: [Amps] copper vs steel /SS /brass conductors in a HF tank
> circuit
>
> I just checked with one of the fellows who has designed his
> share of high-power HF rigs and he says brass is the way
> to go. It is usually cadmium-plated to "keep it shiny looking."
>
> Apparently there are varying grades of "stainless" steel and
> some of them are truly bad in RF. High grade SS is OK but
> since you can' tell easily the rule was to simply avoid it.
>
> This note concerns the nuts and bolts used to hold the
> assembly together.
>
> - Jim W4ENE
>
>
>
>
>
>
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--
“I bring reason to your ears, and, in language as plain as ABC, hold up truth
to your eyes.” Thomas Paine, December 23, 1776
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