- Preheat:
- Heat to 1400°F (760°C) Equalize.
- Austenitize:
- 1900-2000°F (1037-1093°C), hold time at temperature 30-60 minutes.
- Quench:
- Parks 50 Oil or positive pressure (4 bar minimum) to below 125°F (50°C)
- If you have salt bath then 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.
- Parks 50 Oil or positive pressure (4 bar minimum) to below 125°F (50°C)
- Temper:
- Twice at 400-1200°F (204-650°C)
- 2 hours minimum each time.
- Aim hardness: HRC 55-62
