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.
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.
| Steel grade | Piece 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 |
| Steel grade | Batch 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 |