4. Description of an ammonia-rich carbonitriding atmosphere
HN carbonitriding, like standard carbonitriding (% NH 3 < 3% by vol. generally for structural steels), is carried out in conventional carburizing furnaces of widely varying technologies: N 2 /CH 3 OH process, endothermic gas, in situ alkane cracking. The atmosphere will be governed by the main "equilibrium" reactions: ammonia dissociation, the nitriding reaction and carburizing reactions; to these will be added additional secondary reactions (figure 12 ).
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Description of an ammonia-rich carbonitriding atmosphere
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