- Annealed Hardness: BHN 183/212.
Critical Temperature: 1385F (750C)
Annealing: 1440F (780C), hold 2 hours, slow cool 25F(15C)/ hr max. to 1200F(650C), then air or furnace cool. Hardness BHN 183/212 Stress Relieving
Annealed Material: 1100-1300F(595-740C), hold 2 hrs, air cool.
Hardened Material: 50-100F(30-55C) below last tempering temperature, hold 2 hrs, air cool.
Straightening: Best done warm 400-600F (205-315C).
Hardening: (Atmosphere or Vacuum Furnace).
Preheat: 1200-1250F (650-675C), equalize.
High Heat: 1500-1550F (815-845C), soak 10 to 30 minutes. For vacuum or oil hardening, use the high side of the high heat range and soak times. Use the low side of the temperature range for water hardening.
Quench: Oil or water quench to hand warm, 150F (65C). Temper immediately.
Temper: Tempering at 300-500F (150-260C) for at least 2 hours at temperature is recommended. Air cool to room temperature after tempering.