Harm of heat treatment to people

The main hazard is radiation, especially near the high temperature furnace. Over time, the heart will fail prematurely. Then there is the high-frequency quenching furnace, which has a large radiation and a small radiation range, about three meters. Otherwise, the state stipulates that heat treatment workers, male 55 and female 50, can retire! There was a heat treatment master in our factory who died of heart failure on the spot.