Batch hardening deep freezing -70°C/-95°F of Sandvik 12C27 knife steel

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Temperature should be equalized at 850°C/1560°F for 30 minutes to avoid unnecessary temperature variations.

Austenitizing

Batch furnace. 30 minutes in furnace.

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
61 HRC 175°C (345°F)
59 HRC 225°C (435°F)
56 HRC 350°C (660°F)