[TheForge] heat treet of jack hamar bits for knives

[Lon Humphrey]

yes thanks a millon:)
----- Original Message ----- 
From: "marilyn traber 011221" <phlip at 99main.com>
To: <munlaw2 at hcsmail.com>; "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Monday, May 22, 2006 9:29 AM
Subject: RE: [TheForge] heat treet of jack hamar bits for knives


>> Lon,
>>
>> Goddard published "The Big Steel Chart" in "Blade"; I'll look for
>> the issue. Also, Jim Hirsoulus' book has an in-depth treatise on the
>> heat treatment of various steels.
>>
>> Ron Childers
>
> I happen to have Hrisoulas' "Master Bladesmith" right here.
>
> S-5
>
> S-5 is used for the same basic tools as S-1, but its molybdenum content 
> makes
> it considerably tougher and somewhat harder. It is also a bit red hard.
>
> Carbon: 0.55 %
> Manganese: 0.80 %
> Silicon: 2.00 %
> Molybdenum: 0.40 %
> Wear resistance: Medium
> Toughness: Very high
> Distortion on heat treat: Low
> Red Hardness: Medium
> Forging: Start at 1650 to 1800 degrees F
> Austentite forging: Yes
> Harden: 1600-1700 degrees F
> Quench: Oil
> Tempering: 350-450 degrees F
> Rc hardness: 60-55
>
> No additional notes
>
> S-7
>
> S-7 is a chrome/molybdenum alloy that has excellent shock properties, 
> which
> makes it ideal for larger blades. Its high molybdenum content makes it
> difficult to move under the hammer.
>
> Carbon: 0.50 %
> Manganese: 0.70 %
> Silicon: 0.25 %
> Chromium 3.25 %
> Molybdenum: 1,40 %
> Wear resistance: Medium
> Toughness: High
> Distortion in heat treat: Very low
> Forging: 1700- 2050 degrees F
> Austentite forging: No
> Hardening: 1725 degrees F
> Quench: Air
> Tempering: 300-600 degrees F
> Rc Hardness: 58-53
>
> Notes on forging S-7: Preheat to 1200 to 1300 degrees F for 5 minutes. 
> Raise
> to forging temperature slowly and start to forge from 2050 to 1700 degrees 
> F.
> Anneal immediately by heating to forging temperature and placing in a hot 
> box.
>
> Hope this helps,
>
> Phlip
>
> Don't like getting old? Beats the Hel out of the alternative.
>
> The purpose of life is not to arrive at the grave, a beautiful corpse, 
> pretty
> and well-preserved, but to slide in sideways, thoroughly used up, totally
> worn out, proclaiming, "Wow! What a ride!"
>
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