[TheForge] 4140 heat treat

Sat Sep 13 14:28:00 2003

Heat to about 1600F, cherry red, oil quench or run water onto the face if 
you feel lucky.  Temper to suit your needs.  400F will get you a Rc 50-52 
which is probably too hard for a hammer.  My estimate is to draw to 
blue-gray / gray (600-650)  which should drop it down to about 40Rc.

Quenchcrack

>From: klgeorge <[email protected]>
>Reply-To: [email protected]
>To: [email protected]
>Subject: [TheForge] 4140 heat treat
>Date: Sat, 13 Sep 2003 10:51:08 -0400
>
>I got some 4140 1 3/4" square and am going to attempt to make some 
>hammers.What's the heat treat?
>
>
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