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- Annealed Hardness: BHN 170/201.
Thermal Treatments
Critical Temperature: 1360F (740C).
Annealing: 1500F (815C), hold 2 hours, slow cool 50F(28C)/ hr max. to 1200F (650C), then air or furnace cool. Hardness BHN 170/201.
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 400-800F (205-425C).
Hardening: (Atmosphere or Vacuum Furnace).
Preheat: 1200-1250F (650-675C), equalize.
High Heat: 1550-1650F (845-900C), soak 10 to 30 minutes. For vacuum hardening, use the high side of the high heat range and soak times.
Quench: Oil quench to hand warm, 150F (65C). Temper immediately. Note vacuum furnaces must have oil quench capability.
Temper: Tempering at 400-1200 (205-650C) for 1 hour per inch (25mm) of thickness at temperature is recommended. (2 hrs min.). Air cool to room temperature.
Physical Properties
Modulus of Elasticity .......................................30 psi x 106(207 GPa)
- Specific Gravity ..............................................................................(7.86)
Density ..........................................................0.284 lb/in3(7860 kg/m3)
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