Solution to cracks in induction furnace lining material

The induction furnace is the main equipment in the casting and heat treatment workshop. The stability, reliability and safety of its operation are the guarantee for the normal and stable operation of the casting and heat treatment production line in the flow operation. The induction furnace has good development prospects in the field of thermal processing, such as the main production of casting pre-forging heating furnaces, diathermy furnaces and induction heating for: diathermy, rolling, casting, pipe bending, heat treatment (quenching), welding and other processes. .

Nowadays, when high manganese steel is smelted in an induction furnace, magnesia is used as the lining material under normal circumstances, but cracks always appear. How to prevent cracks? The editor below will introduce how the induction furnace lining is suitable for high manganese steel without cracking.

The thermal shock stability and linear expansion coefficient of magnesia powder are inherently high. Therefore, cracks cannot be prevented. So what kind of furnace lining material can be used to prevent it? Neutral aluminum-magnesium spinel is used to make the furnace lining. It not only has the refractoriness of magnesia, but also has neutral raw materials and does not react with manganese steel. Therefore, there will be no cracks, and the current furnace age is higher than that of magnesia. So it is now popular in the market.

When using aluminum-magnesium spinel to make furnace materials, it should be beaten carefully and baked slowly, and melted quickly. The furnace should be heated up slowly every day, so that during smelting, the expansion of the furnace lining will squeeze the cracks to prevent furnace penetration. If the temperature rises quickly, the molten steel may become liquid before extrusion and penetrate into the cracks to cause furnace penetration.

1. Improve the furnace opening method and use core-pulling molds to prevent transverse cracks formed when pulling out the molds;

2. Improve the oven process and slowly heat up;

3. After starting a furnace, take complete heat preservation and slow cooling measures;

4. Add a mica pad with good sliding properties between the induction coil and the furnace lining to reduce the resistance of the induction coil when the furnace lining expands due to thermal expansion and contraction;

5. Adjust the particle size gradation ratio (increase the proportion of coarse particles).