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

[Dan Tull]

Chuck,
If our final heats are "finishing" as they should be ( removing hammer 
marks, flattening,etc.) at a red heat,
I believe that would be close to critical.
Again for hot work tools.............


dan tull
georgia
abba, afc, S.C. psba, obg,sofa
----- Original Message ----- 
From: "Chuck Robinson" <robi5515 at bellsouth.net>
To: <mspencer at tallships.ca>; "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Thursday, January 13, 2005 11:53 PM
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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