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The pressure in the furnace chamber of the vacuum furnace can be pumped into an industrial furnace whose pressure is lower than atmospheric pressure. The vacuum furnace is heated by electricity, and the surface of the heated workpiece is not oxidized or decarburized, with small deformation and good
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The furnace shell is usually cylindrical, with a frusto-conical bottom underneath, and a spherical disc-shaped bottom for good strength. The furnace shell bears the weight of the furnace lining and metal, as well as the thermal stress caused by the thermal expansion of the furnace lining. Normally,
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