1. Purchase of furnaces should take into account the universality of the process, i.e. a wide range of quenching and tempering temperatures. Especially, it is very convenient to temper high alloy steel directly without stoving after quenching.
2. Control system is the core part of vacuum heating furnace to ensure its reliability, perfection and importance. It is better to have monitoring and fault display, recording functions for imported equipment need to be equipped with remote monitoring functions so as to ensure the timeliness of fault handling and reduce maintenance costs.
3. The selection of vacuum furnace must satisfy the relationship between metal oxides and carbon monoxide equilibrium decomposition pressure according to the chemical composition and heating temperature of the parts to be heat treated. It should also be considered that not pursuing high vacuum degree will not only cause the volatilization of alloy elements, but also increase the investment cost of equipment configuration.
4. The forms and materials of heating elements in vacuum furnace are different to some extent. Generally, high quality graphite is made of plate and rod materials. The quality of heating elements is related to the heating speed and temperature. When choosing the heating elements, we should choose the high performance configuration as far as possible.
5. The reliability and sealing of vacuum system configuration are also very important. If it is unstable or poor sealing, it is easy to have the situation that the vacuum can not reach. At this time, it is possible to change the color or shape of the workpiece. Therefore, we must pay great attention to this aspect when choosing.
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