Two ways to improve the vacuum furnace system temperature difference, really useful!
How to improve the vacuum degree of the vacuum furnace is a very important topic in the production process.
There are two ways to improve the system temperature difference in the evaporation process of vacuum furnace: one is to increase the heating steam pressure; the other is to increase the final number effect vacuum degree. However, the increase of steam pressure in the first effect will lead to the increase of temperature in the next few effects, and the improvement of production capacity is not obvious. On the contrary, it will aggravate the scale formation, shorten the operating cycle, increase equipment corrosion and other problems. Therefore, improving the vacuum is the best choice to increase the total temperature difference of the system.
In recent years, manufacturers use a new type of air cooler to replace the traditional air cooler with better results. In fact, the new type of cooler replaces the sprinkler plate with a sprinkler head, and the cooling water forms a water mist through the sprinkler head distributed in the cooler, which greatly increases the area of vapor-liquid contact between the cooling water and the secondary steam, improves the utilization efficiency of cooling water, and thus the vacuum furnace achieves a higher vacuum degree. The experiment proved that the vacuum degree of the condenser was higher than 2000PA.
Vacuum furnace is mainly used to deal with metal materials, many metal materials are processed by high temperature or for other production, then whether there is a certain kind of metal materials can not be heat treatment in the vacuum furnace?
Theoretically, all metal materials can be heat-treated in a vacuum furnace. However, due to technical requirements, processing costs, and the difficulty of process realization, the following materials (workpieces) are not suitable for heat treatment in a vacuum furnace
1. Materials that are sensitive to N elements at high temperature and easy to form harmful effects.
In order to prevent alloying elements from volatilization at high temperature, vacuum furnace is usually filled with high-purity nitrogen at high temperature to maintain partial pressure, and nitrogen is generally used for cooling. Therefore, this kind of material is not suitable for vacuum furnace treatment.
2. Carbon steel.
From the perspective of cost, the price of carbon steel is low, the price of finished parts is low, it is a waste to use the vacuum furnace treatment, unless the workpiece or the workpiece has no processing margin, the surface quality requirements of expediency.
3. Some materials (workpieces) with special process.
For example, in order to obtain the best mechanical properties, some workpieces are required to obtain bainite, which is generally achieved by isothermal quenching. Another example is T10 steel, which requires high hardness and low deformation. Generally, water-quenching oil cooling process is adopted. Although the vacuum furnace can obtain high hardness by high-pressure gas quenching, it cools faster and deforms more rapidly at the temperature below Ms.
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