根据冶金热力学的计算结果，提出了钢液气相界面可能发生的NH3和［O］、［S］耦合反应。该界面反应过程促使NH3在钢液界面生成易被钢液吸收的活性氮原子，同时，脱除了钢液中的氧、硫杂质元素，与常压下钢液吹氮增氮的工艺比较，可以取消为增氮而采用的钢液预脱氧、脱硫工艺环节，减少钢中非金属夹杂物的生成。10 kg中频感应炉的冶炼实验结果表明，合金成分相同的钢液供给等摩尔氮含量的氮化介质，NH3比N2的增氮效果提高了18%~75%。吹NH3条件下，钢液中保持一定量的氧、硫表面活性元素，有利于氮的吸收。
Based on the metallurgical thermodynamics, the coupling reaction of NH3 with ［O］,［S］ can improve the generation of active nitrogen atoms to be absorbed by liquid steel more easily than nitrogen molecules. At the same time,ammonia gas blowing can remove the oxygen and sulfur from liquid steel and decrease the inclusion content in the steel.For nitrogen alloying by blowing nitrogen under normal pressure, the liquid steel should be deoxidized and desulfurized because ［O］,［S］ as surface active elements are not favorable to nitrogen absorption. Experiments of melting high nitrogen steel (HNS) in tenkilogram inducton furnace indicated that,the nitrogen absorption effect of NH3 blowing is increase 18%~75% higher than that of N2 blowing. The process of melting HNS by blowing NH3 under normal pressure requires moderate content of ［O］,［S］ in molten metal.
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