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Tech Talk 28: Heat treating using oil quenching and molten salt baths

Risk advisory I July 2019
  • Controlled heating to high temperatures, combined with rapid and controlled cooling, enables metal parts to be hardened and/or tempered to provide desired properties.
  • Fire and explosion hazards exist during heating and quenching operations due to combustible gas atmospheres in furnaces, combustible oil baths, reactive properties of salt baths, as well as the presence of ignition sources.
  • Risk reduction can be achieved by preventive and protective means, such as control of water content in oil, redundant level, temperature and agitation controls in oil tanks, proper maintenance of furnace units, proper storage of salts, and the installation of automatic fire extinguishing systems.
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