Piece hardening of Sandvik 12C27 knife steel

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Austenitizing

Belt furnace. Time in furnace according to the table.

Thickness, mmThickness, inTime, minutes
2.5 0.100 5
3.0 0.118 6
3.25 0.128 7
3.5 0.138 8
3.75 0.148 10
4.0 0.157 12
4.9 0.192 25

Quenching

Quench as rapidly as possible. For optimal results 600°C (1110°F) should be reached within 2 minutes or less.

Tempering (2 hours)
HardnessTemperature
59 HRC  175°C (345°F)
57 HRC  225°C (435°F)
54 HRC  350°C (660°F)