CARBONITRIDING PROCESS, PROCESS FOR PRODUCTION OF MACHINE PARTS, AND MACHINE PARTS

摘要

A carbonitriding process which comprises an atmosphere control step (50) and a heating pattern control step (60) and which is improved in the invasion rate of nitrogen and in the efficiency of carbonitriding. The step (50) comprises an undecomposed NH₃ partial pressure control step (51) and a CO/CO₂ partial pressure control step (53). In the step (50), the steps (51) and (53) are conducted in such a way that a_c ^*d