Partially carburized heat treated stainless ferrule, and manufacturing method therefor

According to one aspect of the present invention, provided is a partially carburized heat treated stainless ferrule, wherein a first region has a first hardness, a second region has a second hardness, the first region comprises: a nitrogen layer in which the concentration of nitrogen is greater than that of carbon; and a carbon layer provided inside the nitrogen layer in which the concentration of carbon is greater than that of nitrogen, and the first hardness is greater than the second hardness. Through such partial heat treatment, the front portion of a region excluding a part to be heat treated is cured by heat treatment, thereby preventing a phenomenon in which rotational torque increases. 根据本发明的个方面，提供种局部碳氮共渗热处理的不锈钢套圈，其第区域具有第硬度，第二区域具有第二硬度，所述第区域包括：具有比碳浓度高的氮浓度的氮层；和在所述氮层内部并且具有比氮浓度高的碳浓度的碳层，所述第硬度大于所述第二硬度。通过这种局部热处理，在区域的除了待被热处理的部分的前部通过热处理被硬化，由此防止了旋转扭矩增加的现象。