[modeleng] Re: Model Engineers Laser Company

Now that you mention it, Harry, I did read in an old
manual on Gunsmithing that small parts could be "skin
hardened" with an Acetylene torch by using a
"Carburizing flame."

Al
--- Harry Wade <hww@xxxxxxxx> wrote:

> At 11:17 PM 7/20/07 +0100, you wrote:
> >Ordinary Mild Steel (MS) can't be hardened by
> heating/cooling(except by
> >using case-hardening methods) - Andy
> 
> Andy,
>     In my experience it can, at least when the steel
> has been oxy/acetly
> flame cut.  I had some 1" hot rolled mild plate
> flame cut a few years ago
> and found that almost 1/8" of material at the cut
> edges was glass hard and
> ruined HSS cutters.  I assumed the oxygen and/or
> acetylene somehow altered
> the skin near the cut and I ended up having to have
> the pieces annealed.  I
> can't speak to any other combination of materials.
> 
> Regards,
> Harry
> 
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