Piece hardening -20°C/-5°F of Sandvik 12C27M knife steel

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Austenitizing

Belt furnace. Time in furnace according to the table.

Thickness, mm Thickness, in Time, 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.

Deep freezing

The material only needs to reach the desired deep freezing temperature, no soaking-time is required.

Tempering (2 hours)
Hardness Temperature
59 HRC 175°C (345°F)
57 HRC 225°C (435°F)
55 HRC 350°C (660°F)