[TheForge] Re: Porous Cast Iron

[Larry Brown]

I assumed at first the water was from condensation of gasses but I notice 
different types of steels seem to give different amounts. I find harder or 
abrasive resistant steels to have it much less noticeably than mild steel 
especially if a little rust is involved or the surface is abraded.
130# must make leaks easy to find ;-) wow, too bad there is no longer a 
choice in fittings around me all the plumbing houses have the same crap 
pretty much as HD.
LB


At 11:39 PM 3/24/2008 -0800, you wrote:
>Larry;
>I've always assumed that the water was from condensation of combustion 
>products on the cold metal. Just seems like too much water to be in the 
>metal itself...Especially clean steel slabs.
>We have 130# of water pressure and have sure found pin holes in those 
>import castings.....pf
>
>Larry Brown wrote:
>>The porousness should not extend through the piece. Watch HD's Chinese 
>>fittings, a lot of bad castings with holes. Usually the metals, iron, 
>>cast iron and steel will hold a certain amount of moisture in their 
>>surfaces. I have seen water bubble up and run from an acetylene torch 
>>when cutting cold plate and the same when heating cast iron to repair it.
>>
>>At 03:07 PM 3/24/2008 -0600, you wrote:
>>>Seems that if cast iron were truly porous, it would be useless for pipes.
>>>
>>>CraigS
>>>Gresham, OR
>>>
>>>
>>>
>>>
>>> >From: Andy Gladish <gladish at cablerocket.com>
>>> >Date: 2008/03/24 Mon PM 01:57:27 CST
>>> >To: Sponsored by ABANA <theforge at mailman.qth.net>
>>> >Subject: Re: [TheForge] Re: File Making
>>>
>>> >On Mon, 24 Mar 2008 12:37:08 -0700, <schade at acegroup.cc> wrote:
>>> >
>>> >>
>>> >> On Mar 24, 2008, at 1:51 PM, Jeffrey Polaski wrote:
>>> >>>
>>> >>> Are there any guide lines on how much a hunk of steel can absorb?
>>> >
>>> >> zip, nada, none, zero, zilch, nil
>>> >>
>>> >> bob
>>> >
>>> >I don't know about that- I regularly dry steel out as part of the preheat
>>> >before welding- I know some of what appears to be water coming out is
>>> >actually condensation but I don't think that's all of it. Cast iron is
>>> >certainly porous.
>>> >
>>> >--
>>> >Andy Gladish, Metal Work
>>> >Element Forge
>>> >www.ElementFe.com
>>> >Email:  andy at elementfe.com
>>> >Portfolio @  elementfe.carbonmade.com
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