Beats me.
Here is the data that I got straight from the Crubicle web site. This is what I've just done to my first S35VN blade and everything is fine so far..
Hardening
Preheat: Heat to 1550-1600�F (845-870�C) Equalize.
Austenitize: 1900-2000�F (1035-1095�C), hold time at temperature
15-30 minutes.
Quench: Air or positive pressure quench (2 bar minimum) to
below 125�F (50�C), or salt or interrupted oil quench to about
1000�F (540�C), then air cool to below 125�F (50�C).
Temper: Double temper at 400-750�F (200-400�C). Hold for
2 hours minimum each time. (See Table) A freezing treatment
may be used between the first and second tempers. Freezing
treatments help to attain maximum hardenability and must
always be followed by at least one temper.
NOTE: For optimum stress relieving, CPM S35VN may be tempered
at 1000-1025�F (540-550�C). Tempering in this range may
result in a slight decrease in corrosion resistance.
DT
