Re: Building steps

Posted by PeterD on May 18, 2009, 7:18 pm

wrote:

>ideally all rebar should be non magnetic stainless, which never
>rusts.........

Ideally all people should understand the various properties of

'stainless steel'... <g> Stainless rusts just fine when *not* exposed

to air!

Posted by bob haller on May 19, 2009, 7:40 am

> wrote:

> >ideally all rebar should be non magnetic stainless, which never
> >rusts.........

> Ideally all people should understand the various properties of
> 'stainless steel'... <g> Stainless rusts just fine when *not* exposed
> to air!

I would like a link to that! I was told non magnetic stainless doesnt
rust.

What makes this problem worse in florida was the use of beach sand
containg salt.

this info courtesy of this old house episode:)

Posted by PeterD on May 19, 2009, 9:19 am

wrote:

>> wrote:

>> >ideally all rebar should be non magnetic stainless, which never
>> >rusts.........

>> Ideally all people should understand the various properties of
>> 'stainless steel'... <g> Stainless rusts just fine when *not* exposed
>> to air!

>I would like a link to that! I was told non magnetic stainless doesnt
>rust.

I'll see what I can dig up. This is 'common knowledge' among boat
builders, but not others. Problem being that the stainless looks
really good on the exposed surfaces, then when you try to remove it,
you find a 'ton' of rust on the burried parts. You could also try
searching various marine sites too, I'm sure you will find it.

FWIW, I didn't believe it when I was told first about the problem,
then managed to see it as I did work on boats.

>What makes this problem worse in florida was the use of beach sand
>containg salt.

I think the entire state of Florida contains salt! <g> WHere in

Florida are you, I'm frequnently in Tampa, and when to high school in
NPR.

>this info courtesy of this old house episode:)

Posted by RicodJour on May 19, 2009, 9:35 am

> wrote:

> >I would like a link to that! I was told non magnetic stainless doesnt
> >rust.

> I'll see what I can dig up. This is 'common knowledge' among boat
> builders, but not others. Problem being that the stainless looks
> really good on the exposed surfaces, then when you try to remove it,
> you find a 'ton' of rust on the burried parts. You could also try
> searching various marine sites too, I'm sure you will find it.
> FWIW, I didn't believe it when I was told first about the problem,
> then managed to see it as I did work on boats.

Oxygen is inseparable from oxidation (rusting). I think it's more
likely that moisture was getting into those hidden areas and staying
there longer.

R

Posted by RicodJour on May 19, 2009, 2:26 pm

> I don't know the science of it (or very much else for that matter),
> but I know that if you use a stainless steel bolt, you are NOT
> supposed to use a stainless steel nut or else the threaded area where
> they touch will corrode all to heck and you won't be able to get them
> apart. =A0 There is something, but I don't know what, about stainless to
> stainless and a lack of O2.

You can use stainless bolts and nuts, but there are good practices
when doing so, just as everything else in life.
http://www.estainlesssteel.com/gallingofstainless.html

PeterD was saying the stainless rusts when there's no oxygen, and
that's what I was addressing, that you addressed, that I just
addressed. Okay, I'm going to go up on a ladder now, I'm getting
dizzy down here. ;)

R

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