Furnaces used for heat treating steels include salt bath furnaces, controlled atmosphere furnaces, fluidized-bed furnaces, and vacuum furnaces. These furnaces are designed to reach and maintain specific temperatures required for heat treating steel.
Salt bath furnaces use a bath of molten salt to heat the steel. This method provides precise control over the temperature and atmosphere during the heat treating process.
Controlled atmosphere furnaces create a controlled environment by introducing gases such as nitrogen or argon into the furnace. This helps to prevent oxidation and achieve the desired heat treatment results.
Fluidized-bed furnaces use a bed of finely divided particles, such as sand or alumina, to heat the steel. The steel is submerged in the fluidized bed, which provides even heating and uniform heat treatment.
Vacuum furnaces are commonly used for heat treating certain types of steels. These furnaces create a vacuum environment, which eliminates the presence of oxygen and allows for precise control over the heating process. Vacuum furnaces are often used for heat treating tool steels and other high-performance steels.
In addition to these specific types of furnaces, electric resistance furnaces are commonly used for heat treatment of metals and alloys. These furnaces use electric resistance heating to reach and control the desired temperatures. Induction heating is also a commonly used method for surface hardening of steel.
Overall, the choice of furnace for heat treating steel depends on the specific requirements of the heat treatment process, such as temperature range, atmosphere control, and the type of steel being treated.
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