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What are the advantages and disadvantages of acid crucibles for induction furnaces?

Author : Hongteng Time: 2022-06-16

Crucible is a component that is often used in induction furnaces when smelting metals. In addition to being used to hold molten metal for smelting, the crucible also plays the role of heat insulation, insulation and energy transfer.

Common intermediate frequency furnace crucibles mainly include alkaline crucibles, acid crucibles, and neutral crucibles. Today, the editor of Hongteng will introduce to you the advantages and disadvantages of acid crucibles.


1. The acid slag has high viscosity, low air permeability and good isolation effect on the atmosphere. The amount of hydrogen and nitrogen absorbed by molten steel from the atmosphere is small, and the gas content in the final product is low.

2. The inclusions in the acid crucible steel are mainly silicates, and there are almost no aluminates inclusions. The former has a low melting point and is easily removed by polymerization. Therefore, the brittle inclusions of the steel smelted by the acid crucible are less and the purity is high.

3. There are few silicate inclusions in molten steel, and there are few high melting point inclusions. In addition, the silicon content in the molten steel is relatively high, and the fluidity of the molten steel is good. Therefore, acid crucible steel is suitable for the production of cast steel parts.

4. Since the acid slag has a good effect on atmospheric isolation and the FeO activity in the slag is low, the oxidation loss of alloying elements is small. Therefore, the acid crucible is suitable for the smelting of scrap, and the alloying elements in it can be well recovered.

5. During acid smelting, the service life of acid crucible is longer than that of alkaline crucible due to the low temperature of molten steel, poor fluidity of slag, weak erosion of crucible, and small expansion of crucible material.


1. The acid crucible has low refractoriness. When smelting metal, the temperature of molten steel should not exceed 1600°C, so the metallurgical reaction at high temperature is limited, and desulfurization and dephosphorization cannot be carried out effectively.

2. Poor chemical stability. The slag and lining of acid crucibles contain SiO2. SiO2 will have a reduction reaction with some metals, resulting in an increase in the silicon content in the molten steel.

In general, when choosing an intermediate frequency furnace crucible, you can inform the manufacturer of your needs and the types of smelted items, and let the manufacturer make suggestions. We can refer and choose according to the manufacturer’s suggestions.

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Video of the use process of the furnace

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