[TheForge] why doesn't cast iron oxidize and burn in the same way?(was: oil/wax finish, blackened steel)

[peter fels & phoebe palmer]

If you put a red hot piece of iron in an oxy atmosphere, it'll burn and 
produce heat in the process.
The rust is a different molecular form of oxidized iron than slag.
Once iron starts burning, the heat produced sustains the continued cut 
under the oxy jet and the pressure blows the slag and some melted iron 
out the bottom.

On 11/2/2010 12:04 PM, Andy Gladish wrote:
> It ain't all the tree's fault. I often compare my mind to a very small
> table- or any horizontal surface in my shop- it's completely full of stuff
> so when you put something on one side you automatically push something off
> the other side.
> I still don't really "get" what's going on with the torch cutting, is it
> correct to think of it as a hyper-fast rusting process? It seems very
> different, since rust doesn't produce anything much like slag..
>
> -----Original Message-----
> From: Jerry Frost
>
> ...Funny how someone with a decent size chunk of gray matter turned to rust
> remembers the darndest things. This bit came right to mind when you asked
> Andy but I can't recall one of my niece's name for nothing. Damn TREE!
>
> Jer
>
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