Introduction to Bell Furnace The furnace base is fixed, the heating furnace hood can be moved or the heating furnace hood is fixed, and the furnace base can be lifted and lowered. The traditional bell furnace uses nitrogen-hydrogen mixed gas as the protective medium. Compared with nitrogen, hydrogen has the advantages of good thermal conductivity, low density, low dynamic viscosity and strong reducibility, and gradually replaces the nitrogen-hydrogen mixed gas as the protective gas. At the same time, it puts forward more stringent requirements for the safety control of bell furnaces.Carbonitriding of 12CrNi3A Steel Parts First of all, the metal shell of the protective cover and the terrace are all tested by X-ray to strictly ensure the processing quality of each equipment. Second, at the beginning of the annealing cycle, check all gauges and switch positions so that they are in the correct setting. After the inner cover is fastened on the prepared furnace table, the leakage test of the hydrogen inlet valve is carried out, and then the leakage test of the furnace table space is carried out to ensure that the furnace table and the inner cover system are completely sealed. Each device conducts
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