What are the key points for the selection of intermediate frequency furnace lining materials? Do you really know?

What are the key points for the selection of intermediate frequency furnace lining materials? Do you really know?

The choice of furnace lining material largely determines the service life of the intermediate frequency furnace. At present, improving the service life of the intermediate frequency furnace is also the focus of the intermediate frequency furnace manufacturer. Do you choose? The following Yuhua editor will take you to see:

1. Sufficient refractoriness

The basic factor that determines the refractoriness of refractory materials is the chemical mineral composition and distribution of the material. Various impurity components, especially those with a strong flux effect, will seriously reduce the refractoriness of the product. The refractory degree of refractory materials refers to refractory materials The temperature in degrees Celsius at which the cone sample resists high temperature action without softening and melting without load. Simply put, refractoriness refers to the performance of refractory materials against high temperature action without melting. Whether it is used as a basis for refractory materials. The International Organization for Standardization stipulates that inorganic non-metallic materials with a refractoriness of more than 1500 degrees Celsius are refractory materials. Therefore, the main way to improve the refractoriness of refractory materials is to take appropriate measures to ensure and improve the purity of raw materials.

When the intermediate frequency furnace is smelting, the high temperature of molten steel can reach 1700 degrees, and the high temperature of molten iron can reach more than 1500 degrees. Therefore, the lining material that can meet the smelting temperature should be selected according to the smelting temperature of the metal to be smelted.

2, good chemical stability

Slag erosion is a common damage form of refractory materials in the use process, such as the lining of the intermediate frequency furnace, the working lining of the ladle, and the damage to the lining of the cupola from the lower part of the furnace body to the hearth, mostly caused by this effect. .In actual use, about 59% of the damage is caused by the erosion of slag. Slag resistance is the ability of a refractory to resist the erosion and scour of slag at high temperatures.

When selecting refractory materials, try to choose refractory materials with similar chemical composition to slag to weaken the reaction strength on their interface. For example, when melting high manganese steel, the lining material should choose basic refractory materials, etc.; or try to change the composition of slag to make it Moving closer to the refractory composition used is also one of the ways to improve the slag resistance of the refractory.

3, good thermal shock resistance

Refractory materials are often subjected to rapid changes in ambient temperature during use. For example, during the smelting of intermediate frequency furnaces, the furnace temperature changes during tapping or operation, and the temperature and pressure of the ladle will change rapidly during the pouring process. , resulting in cracks, peeling and even collapse of the lining and lining. This damage limits the heating and cooling rates of the lining, lining and furnace, and limits the strengthening of the furnace operation, which is the main reason for the rapid damage of the lining and lining. .

4, fixed high temperature strength

The high temperature compressive strength of refractory materials refers to the pressure that the material can withstand in a high temperature thermal state above 1000 degrees Celsius - 2000 degrees Celsius, expressed in N\/m2. The compressive strength of refractory materials generally increases with temperature. The change of . When the temperature starts from room temperature, it starts to decrease linearly with the increase of temperature. After that, some materials continue to decrease with the increase of temperature; some materials increase with the temperature when the temperature rises to a certain range. It increases, and reaches a higher value at a certain temperature, and then decreases sharply.

During the smelting process of the intermediate frequency furnace, the lining wall must withstand the impact force of the metal charge, the static pressure of the molten metal, the force of the electromagnetic stirring of the molten metal, the temperature difference stress, etc. Therefore, the selected furnace lining material should have a certain high temperature compressive strength. , It does not crack under the action of various forces and is resistant to erosion. The high temperature strength of the furnace lining material is directly related to the hardness of the particles that constitute the refractory material. The bond strength between particles and the porosity of the refractory matrix also affect the wear resistance. For the same material, its wear resistance decreases with increasing temperature.

5, the thermal conductivity should be small and the electrical conductivity should be low

During the smelting process of the intermediate frequency furnace, the temperature difference between the inside and outside of the furnace wall is very large, and about 10%-15% of the heat is dissipated through the furnace wall. It must have low electrical conductivity and must not contain magnetic induction substances, especially in the process of knotting the furnace lining, it is not allowed to mix metals or substances with strong electrical conductivity in it.

6, to meet the requirements of environmental protection

The furnace lining material does not release substances that are toxic, harmful and polluting the environment during the use of the furnace lining material, and the waste after use cannot cause harm to the environment.

7, cost-effective

According to the smelting materials and requirements, choose cost-effective materials. It can save costs and use suitable and safe furnace lining materials. Luoyang Yuhua is a manufacturer direct sales, with many years of production qualifications, not only has the above performance, but also And the price is good and cost-effective.