Piece hardening with deep freezing at -20°C/-5°F of Sandvik 14C28N knife steel

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Austenitizing

Belt furnace. Time in furnace according to the table.

ThicknessThicknessTime
mmin.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
HardnessTemperature
60 HRC 175oC (345oF)
58 HRC 225oC (435oF)
56 HRC 350oC (660oF)