热处理过程中由于淬火介质使用不当,热处理工件经常产生淬裂、超出规定的变形、金相组织及硬度不符合技术要求等缺陷。因此,正确选择淬火介质是提高热处理产品质量的重要因素之一。汽车、拖拉机轴类及轴承等多数零件的淬火均需在油中进行。目前因为没有专用淬火油,只好用各种牌号的机械油、柴油或几种油混在一起的掺合油代 Heat treatment process due to the improper use of quenching medium, heat treatment of the workpiece often produce quench cracking, beyond the provisions of the deformation, microstructure and hardness does not meet the technical requirements and other defects. Therefore, the correct choice of quenching medium is to improve the quality of heat treatment products, one of the important factors. The majority of parts such as automobiles, tractor shafts and bearings are quenched in oil. Because there is no special quenching oil, had to use a variety of mechanical oil, diesel oil or mixed with oil mixed with oil generation