零件高频或中频淬火后,应立即检验硬度,大多数的零件淬火后,一般硬度均为HRC54～62。在批量生产中,淬火时的硬度检验十分重要(它可发现材料及工艺参数等许多问题)。回火后的硬度检验可以减少比例,还从回火后的颜色可以判别,即:机加工未淬火的部分保持原来光亮的颜色;回火后仍保持淬火后的颜色,则仍保持了淬火 Parts of high-frequency or IF quenching, hardness should be immediately tested, the majority of parts after quenching, the average hardness of HRC54 ~ 62. In mass production, hardness testing during quenching is very important (it can be found in materials and process parameters and many other issues). After tempering the hardness test can reduce the proportion, but also from the color after tempering can be identified, namely: not quench the machined parts to maintain the original bright color; after tempering still maintain the color after quenching, then still maintain the quenching