Selection of lining materials for intermediate frequency furnaces

The quality of the intermediate frequency furnace lining determines the service life, and it needs to have good refractory performance and stability to be put into use better. The intermediate frequency furnace lining of different materials will have different reactions with the raw materials during use, so what material is selected depends on Judging by its use, the acid lining is mainly quartz sand, which is cheap, widely distributed, has good insulation, low construction requirements, few defects in application, and relatively stable production.

However, quartz sand has low refractoriness, which cannot meet the requirements for casting large-scale intermediate frequency furnaces. In addition, there are two phase changes during the heating process, poor dimensional stability, and unsatisfactory chemical stability. It is easy to react with slag and cause erosion, which is an influence The main reason for the service life of intermediate frequency furnace lining , The thermal shock stability is also greatly improved. So how to choose the lining material of the intermediate frequency furnace?

1, cast steel

At present, intermediate frequency furnaces below 500kg are mostly used for melting poetry steel and special steel. The lining materials generally use dry ramming materials such as quartz, magnesia and magnesia spinel. The service life is generally 50-150 heats. In recent years Melting and holding furnaces with a capacity of more than 1t are gradually increasing and are developing in the direction of multi-variety smelting, high-temperature smelting and high-power rapid melting.

2, cast iron

In the past, most of the cast iron was melted using power frequency induction furnaces. In recent years, due to the advantages of medium frequency and variable frequency induction melting furnaces, the frequency conversion furnaces and intermediate frequency furnaces accounted for a considerable proportion of the newly installed cast iron induction furnaces. The lining refractory materials for cast iron induction furnaces are generally Acidic quartz ramming materials are used, and cheap natural quartz ramming materials are mostly used in China.

The above is the answer to what material is used for the lining of the intermediate frequency furnace, and the scope of application of the lining of different materials is also different.