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Talk about the specific quenching method of vacuum tube furnace

Today we will talk about the specific working methods of the vacuum tube furnace and the quenching methods used.
Its working mode adopts pre vacuum atmosphere protection. During operation, the vacuum degree in the furnace can be pumped first, and then the high-purity nitrogen or ammonia decomposition atmosphere can be filled in for protection and heating, so as to achieve the purpose of oxidation free heating and decarburization free brightness. The mixing fan is used, which has high furnace temperature uniformity.
The heating elements of the vacuum tube furnace are made of high-quality materials and have a long service life. They are equipped with exhaust ports and inert gas inlets. RS-485 serial port can be selected for 40 segment programmable controller model to realize computer communication.
The heating elements of the vacuum tube furnace are located on both sides and below the furnace, and there are circulating air ducts and thermal circulating fans in the furnace. The furnace cover is automatically opened and closed, and one or two pipes can be solidified each time. Electric heating elements are used for heating, generally used for melting nonferrous metals and alloys with a melting point of about 1000 ℃. It is made of heat-resistant stainless steel. During heating and cooling, the furnace is protected by high-purity nitrogen, and the material surface is bright without oxidation. Specific quenching methods and principles are as follows:
1、 Quenching method:
1. Single liquid quenching: only one coolant is used for quenching workpiece in tubular heating furnace.
2. Precooling and quenching: When quenching the workpiece in a tubular heating furnace, the workpiece shall be cooled properly before being immersed in the coolant.
3. Double liquid quenching: the workpiece is first immersed in water for cooling, and then immersed in oil for slow cooling.
4. Stepped quenching: the workpiece is first immersed in molten salt for cooling, and then cooled in air.
5. Hot bath quenching: the workpiece is only immersed in high temperature nitrate or alkali for cooling, and then cooled in air.
6. Isothermal quenching: the workpiece is immersed in the isothermal molten salt for cooling.