[TheForge] Re: Porous Cast Iron

[Peter Fels And Phoebe Palmer]

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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