[TheForge] heat treet of jack hamar bits for knives

[marilyn traber 011221]

> 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 
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