M35 HIGH-SPEED STEEL




  

HEAT TREATMENT
  

  • Soft-annealing 850C 900C / 1560F 1650F, slow cooling 10C / 18F/h to 700C / 1290F, hardness max 260 Brinell.
     
  • Stress relieving 600C  700C / 1120F 1290F, approx. 2 hours at temperature, slow cooling to 500C / 930F.
     
  • Hardening with preheating in two steps 450C 500C / 840F 930F, 
    850C 900C / 1560F 1650F and austenitizing at 
    1050C 1220C / 1920F 2230F.  Quenching to about 550C / 1022F then cool in air to hand warm
     
  • Tempering at 560C / 1040F or higher 2 times for at least 1 hour at full temperature is recommended.