What kind of jobs can you find with metal heat treatment majors?

The best and most practical job at the undergraduate level is metal supervision in thermal power plants. Generally, those majoring in metal heat treatment are recruited. You can also try to work in steel plants, boiler plants, steam turbine plants, automobile manufacturing plants, and shipbuilding. You can go to a factory, but these are relatively inferior to going to a power plant; for a master's degree, consider going to a pilot laboratory, a mechanical research institute, a subsidiary of the Bureau of Technical Supervision, etc., but it's not easy to get in, and those who are miserable will have nothing to choose from. Of course, it also depends on the reputation of your school.