Hardening programs for Sandvik's knife steels

The hardening programs are carefully matched to the various Sandvik steel grades. Choose the furnace type to suit either individual pieces or an entire batch. Then select a steel grade.

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The hardening cycle starts with heating from room temperature to the required hardening temperature (A = austenitizing) of between 1050 and 1090°C (1922 and 1994°F), depending on the steel grade.

The material is then quenched (Q = quench) to room temperature in the space of less than 2 minutes, possibly followed by deep-freezing (DF = deep-freezing) to between –20 and -70°C (-4 and -94°F).

This is followed by the tempering process (T = tempering), during which the material is heated to 175 - 350°C (347 - 662°F), depending on the required hardness.

Belt furnace
Steel gradePiece
hardening
Piece hardening,
with deep freezing -20°C (-5°F)
Piece hardening,
with deep freezing -70°C (-95°F)
Sandvik 7C27Mo2
Sandvik 12C27M
Sandvik 12C27
Sandvik 13C26
Sandvik 14C28N
Sandvik 19C27
Batch furnace
Steel gradeBatch
hardening
Batch hardening, with deep freezing -20°C (-5°F)Batch hardening,
with deep freezing -70°C (-95°F)
Sandvik 7C27Mo2
Sandvik 12C27M
Sandvik 12C27
Sandvik 13C26
Sandvik 14C28N
Sandvik 19C27