Tempering – Temper immediately after quenching. Hold at tempering temperature for no less than 2 hours. Tool and punches are normally tempered at 350°F/400°F for max. hardness.
Annealing – Vacuum furnace or pack in sealed container. Heat slowly to 1,425°F/1,450°F. Hold for 1 hour per inch of thickness. Cool slowly in furnace. Expected hardness is 212 BHN.
Hardening – Heat slowly to 1,475°F/1,500°F. Hold for uniformity. Oil quench. Pre-heat to 1,200°F/1,250°F. Cool slowly. At 125°F/150°F begin tempering. Do not allow to cool to ambient room temperature.
@ 800°F typical hardness Rockwell “C” 50.
@ 1,000°F typical hardness Rockwell “C” 44.
@ 1,200°F typical hardness Rockwell “C” 30.
* Above values are typical and are not guaranteed.