Preheat: Heat to 1400°F (760°C) Equalize.
Austenitize: 2050°F, hold time at temperature 45-60 minutes.
Quench: Oil or positive pressure (4 bar minimum) to below 125°F (50°C), or salt quench to about 1000°F (540°C), then air cool to below 125°F (50°C). Salt bath treatment, if practical, will ensure the maximum attainable toughness for a given hardening treatment.
Temper: Twice at 1000°F, 2 hours minimum each time.
Aim hardness: HRC 55-62