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Heat Treating
- Carburizing — Wikipedia
- Case-Hardening — Wikipedia
Thermal Refining
Thermal refining means that parts get both quenched (cooled in a liquid) and tempered (cooled in air). See the following links for more information:
- Quenching and Tempering (Thermal Refining) from Nagato Heat Treatment
- Quenching and Tempering from Onex Corporation