Liquid steel vacuum treatment is a very important aspect of vacuum metallurgy. It is a process of degassing, discharging harmful impurities and alloying the liquid steel melted in open hearth furnace, converter or electric furnace in the atmosphere in different process ways. At present, this device has become the most basic part of modern iron and steel enterprises all over the world. For example, the United States, West Germany, Japan, the Soviet Union and other countries have 100% vacuum degassing treatment for bearing steel, electrical steel and high-quality large forgings, which is taken as the national standard.

With the development of modern science and technology, especially the increasing requirements of aerospace technology and military production for metal materials, it is inseparable from vacuum technology.

Vacuum melting is an important branch of vacuum metallurgy. It can accurately control the chemical composition of products, improve the purity of products and improve the as cast structure of products.

Vacuum induction melting is a mature vacuum melting method, which is mainly used to produce consumable electrodes and precision casting parts for secondary vacuum. Large vacuum induction furnace is also used to produce high-quality special steel ingots.

1. The heating principle is advanced and reasonable

The heating of products by pressure swing vacuum drying equipment is to use the water vapor evaporated from the dried products in the vacuum drying tank as the heat transfer medium to exchange heat between the heater and the dried products. This heating method is similar to kerosene gas-phase drying heating. The heating uniformity is very good, and the heating efficiency is high and stable.

2. High production efficiency

Drying the body of a 110kV transformer takes only about 40 hours, and its production efficiency is equivalent to that of kerosene gas.

3. Endpoint judgment

At the end of drying, the comparison method recommended by Dr. Moore is used to judge the end point, which is automatically carried out by the operating procedure at the end of drying, and the judgment result is accurate and reliable.

4. Simple equipment configuration

Compared with the hot air circulation drying equipment, the hot air circulation system is removed, and several systems related to kerosene are removed compared with the kerosene gas phase drying equipment. In terms of the number of mechanical equipment systems, it is similar to ordinary vacuum drying in principle. Therefore, the configuration is simple, which greatly facilitates the operation and maintenance.

5. High degree of automation

Because of its clear process route, clear and simple control, it is conducive to the automatic control of the whole drying process, and the reliability of automatic control is high.

6. Relatively low equipment investment

Compared with kerosene vapor phase drying equipment, it can save one third of the investment. It is an advanced equipment that most electrical manufacturers can afford.