夜夜欢性恔免费视频-国产精品福利一区二区-三叶草欧洲码在线-黄页网站视频

Oil Bath Annealing Features:
      Temperature control: The annealing temperature in the oil bath can be controlled more precisely because the thermal conductivity of the oil is relatively uniform, which helps to achieve a more stable heating environment.
      Cooling rate: The cooling rate of the oil is moderate, which helps to achieve a more uniform cooling effect, thereby avoiding excessive thermal stress and secondary hardening.
      Surface quality: Compared to some other annealing methods, oil bath annealing may help reduce surface oxidation and contamination, although this depends on the specific oil type and annealing conditions.