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

[Chuck Robinson]

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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