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How To Heat Treat N690 to 59-61 HRC:Heat to between 649-704 C and hold for 15 min (1200-1300 F)Heat to between 815-871 C and hold for 15 min (1500 - 1600 F)Heat to 1071 C and hold for 20 min (1960 F)Quench rapidly in oil or between plates with compressed air coolingRecommended: Cryo treat by deep freezing to -80 C for 2 hours for max hardness (-120 F)Temper twice at 185-199 C for 2 hours, for 59-61 HRC  (365 - 390 F)Stainless high-quality steel from Austrian maker Bohler Uddeholm. Complex h …