What is the tempering technology of 45# steel?

The high temperature tempering of 45 # steel after quenching, the heating temperature is usually 560 ~ 600 ℃, and the hardness is required to be HRC22 ~ 34. Because the purpose of quenching and tempering is to obtain comprehensive mechanical properties, the hardness range is relatively wide. However, if the drawing requires hardness, the tempering temperature should be adjusted according to the drawing to ensure the hardness. For example, some shaft components require high strength and high hardness requirements; while some gears and shaft components with keyways require milling and inserting after quenching and tempering, the hardness requirements are lower. Regarding the tempering holding time, depending on the hardness requirements and the size of the workpiece, we believe that the hardness after tempering depends on the tempering temperature and has little relationship with the tempering time, but it must be tempered through. Generally, the tempering holding time of the workpiece is always More than an hour.