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离子软氮化能大幅度提高钢铁零件的疲劳强度、耐磨性及抗咬合能力,而且处理时间短、变形小、适用钢种范围广。但硬度较低,硬化层深度较浅,对重负荷零件不适宜。为了充分发挥离子软氮化的优点,克服其不足,我们结合“桥式吊车减速器齿轮表面强化”的研究,将软氮化后的钢件进行再加热淬火,使有效硬化层的深度(HV 500以上)可达0.5～1.0毫米,与只软氮化相比,弯曲疲劳强度提高(盐炉淬火可增加30％,高频淬火可增加52％),
Ionic nitriding can greatly improve the fatigue strength of steel parts, wear resistance and anti-bite ability, and the treatment time is short, small deformation, suitable for a wide range of steel. However, the hardness is lower and the depth of the hardened layer is shallower, which is not suitable for the heavy-duty parts. In order to give full play to the advantages of ion nitrocarburizing, to overcome its deficiencies, we combined with the “bridge crane reducer gear surface strengthening” research, the nitrocarburized steel re-heating quenching, the effective hardening layer depth (HV 500 or more) up to 0.5 to 1.0 mm. Compared with only nitrocarburizing, the bending fatigue strength is improved (30% in salt furnace quenching and 52% in high-frequency quenching)