[TheForge] Re: You can always tell a Yankee...

[Chuck Robinson]

Darrel,
Right, My brain is operating a little slowly today and I thought Kevin was
talking about air hardening steel like A2 and D2, that are self normalizing
each time they air cool below critical.
Chuck
----- Original Message -----
From: "Darrell" <darrell at machinemaster.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Friday, January 14, 2005 1:14 PM
Subject: Re: [TheForge] Re: You can always tell a Yankee...


> Normalizing has to do with grain size while hardening and tempering has to
> do with hardness.
> Darrell
>
> http://www.machinemaster.com
> ----- Original Message -----
> From: "Kevin D" <flyinpig at go-concepts.com>
> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Friday, January 14, 2005 3:49 AM
> Subject: RE: [TheForge] Re: You can always tell a Yankee...
>
>
> > Chuck,
> >
> > Thanks, but does that mean air hardened steel is normalized, as that
> sounds
> > pretty close to hardening process?
> >
> > Kevin
> >
> >   ------Original Message-----
> >   -From: theforge-bounces at mailman.qth.net
> >   -[mailto:theforge-bounces at mailman.qth.net]On Behalf Of Chuck Robinson
> >   -Sent: Thursday, January 13, 2005 11:53 PM
> >   -To: mspencer at tallships.ca; Sponsored by ABANA
> >   -Subject: Re: [TheForge] Re: You can always tell a Yankee...
> >   -
> >   -
> >   -When you normalize carbon steel you bring it to about 50 degrees F
> above
> >   -critical and let it air harden in still air, to black heat.
> >   -It is a thermal  grain refining process.
> >   -If you bring the steel to forging temperature much over critical you
> will
> >   -get grain growth and consequently brittle steel. the thickness
> >   -of the metal
> >   -will affect how fast the metal cools and consequently how hard the
> cooled
> >   -metal will be.
> >   - The less carbon and other alloys in the steel the less effect
> >   -the cooling
> >   -rate will change  the hardness.
> >   -Chuck
> >   ------ Original Message -----
> >   -From: "Mike Spencer" <mspencer at tallships.ca>
> >   -To: <theforge at mailman.qth.net>
> >   -Sent: Thursday, January 13, 2005 5:55 PM
> >   -Subject: [TheForge] Re: You can always tell a Yankee...
> >   -
> >   -
> >   ->
> >   -> > For our use, I wonder what the real difference is between
> >   -> > "normalized" and "as forged"?  As long as the last heats you
don't
> >   -> > beat stresses into it.
> >   ->
> >   -> I dunno, Dan.  Sam Allen, the prof at MIT who is also a blacksmith
> and
> >   -> has a forge shop in the basement of the main building there, wrote
a
> >   -> first-year textbook for materials science.  I keep meaning to order
> it
> >   -> but it keeps getting put off.  I'm not completely clear on the
> >   -> difference, at the crystal or grain level between annealing and
> >   -> normalizing.  (Hence the scare quotes around those words in my
post.)
> >   ->
> >   -> - Mike
> >   ->
> >   -> --
> >   -> Michael Spencer                  Nova Scotia, Canada       .~.
> >   ->                                                            /V\
> >   -> mspencer at tallships.ca                                     /( )\
> >   -> http://home.tallships.ca/mspencer/                        ^^-^^
> >   ->
> >   -> --
> >   ->
> >   ->
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