What should we pay attention to when choosing lining material for intermediate frequency furnace? The following content, together to understand it!

1, the furnace lining should have a certain high temperature strength

In the process of intermediate frequency furnace melting, the furnace wall should be subjected to the impact force of the metal charge, the static pressure of the metal liquid, the force of electromagnetic stirring the metal liquid movement, the temperature difference stress, etc., which will affect the service life of the intermediate frequency furnace lining, so the lining material should have a certain high temperature strength, and do not crack and resist erosion under the action of a variety of forces.

2, the lining thermal conductivity should be small, the conductivity should be low

In the melting process of intermediate frequency furnace, the temperature difference between the inside and outside of the furnace wall is very large, about 10% to 15% of the heat is lost through the furnace wall, in order to reduce heat loss and improve thermal efficiency, the lining material should have low thermal conductivity. At the same time, the lining material should have a low conductivity, can not contain magnetic induction, especially the lining knotting process is not allowed to metal or strong conductive substances included in it.

3, the furnace lining refractories should be excellent

The temperature of molten steel can reach 1700℃ or above, and the temperature of molten iron can reach 1500℃ or above. Therefore, the lining material of the intermediate frequency furnace should have excellent refractibility, and the lining material that can meet the melting temperature or withstand high temperature should be selected according to the smelted material.

4, the lining chemical stability is good

In the process of use, slag erosion is a common form of refractory damage. In the actual use process, more than 59% of the furnace lining material damage is caused by the erosion of slag. Therefore, slag resistance is also one of the important standards for intermediate frequency furnace lining materials. Medium frequency furnace lining should be under the contact of high temperature metal liquid, high vacuum, high (acid) alkaline slag, should not decompose and reduce, do not participate in chemical reaction, and has good chemical stability.

5, the furnace lining heat resistance to good shock

Intermediate frequency furnace lining should also have good resistance to rapid cooling and rapid heat performance, adapt to the stress generated in the lining wall due to the rapid change of temperature and pressure from high temperature melting to the oven, and do not crack, the better the heat shock resistance, the higher the service life of the lining.

6, furnace lining to meet environmental requirements

Intermediate frequency furnace lining materials are required not to release substances harmful to the human body and pollute the environment during use, and the waste after use is as far as possible not to cause harm to the environment. From the economic and practical point of view, the material and requirements of intermediate frequency furnace melting lining are selected, and the lining material with high cost performance is selected.

The above content is for reference only. Welcome to inquire!