S30V - gets hard, stays hard

[rlinger]

Steve,

I moderately ramp to preheat temperature and hold only 7 min.
quickly ramp to 1950 minimum 1965 F maximum and soak 25 min.
rapid air quench
snap temper @ about 300 F / ! hr.
deep cryo minimum 12 hr.
temper @ 400 F / 2 hr (twice)

About 60 HRc

I am fairly sure there is a lose of toughness by using the higer austenitizing temperature. Tempering very high will result in lose of corrosion resistance. Except for BG-42 I try not to temper higher than 600 F. 400 F has worked well for me on S30V. I sometimes temper ATS-34 as high as 600 F and have gotten about 60 HRc.

RL