6. Glossary
carbon potential of an atmosphere
Carbon mass fraction of a steel in thermodynamic equilibrium with this atmosphere.
standard carbonitriding
Thermochemical treatment is found in most workshops. Practitioners currently limit ammonia injection to no more than 3% of the total volume of gases injected into the furnace.
case-hardening
Thermochemical process for surface carbon enrichment (between 0.7 and 0.9% by mass) by diffusion in the austenitic range (900 to 1,050°C depending on the process), followed by quenching and tempering, if necessary, to obtain a high surface hardness (58 to 62 HRC) with a gradient decreasing over a given depth.
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