Instructions for the construction and use of the lining material of the induction furnace

The lining material of the induction furnace is a dry material made of corundum, fine powder, and chromium oxide green. The construction location of the lining material of the induction furnace is different, and the construction method is also slightly changed.

When the lining material of the induction furnace is knotted on the bottom of the furnace, the thickness of the lining material of the bottom of the induction furnace is 280mm, which must be filled in 4 times. When manually knotting, it is necessary to prevent uneven density everywhere. Therefore, the lining of the induction furnace must be strictly controlled. The thickness of the material is generally not more than 100mm each time when the lining material of the induction furnace is knotted, and the thickness of the furnace wall is controlled within 60mm. The lining material of the induction furnace should be rotated slowly around the furnace and the force is uniform.

When the lining material of the induction furnace is knotted at the bottom of the furnace to reach the required height, it needs to be flattened before the crucible mold can be placed. The crucible mold is concentric with the induction ring, adjusted vertically up and down to closely integrate with the bottom of the built furnace, and then adjust the peripheral gap to be equal, clamp it with a wooden wedge, and press the middle hoisting weight to prevent the induction furnace lining material from drying when the furnace wall is knotted The formula material is displaced.

When the lining material of the induction furnace is knotted on the furnace wall, the thickness of the lining material of the induction furnace is 110-120mm, and the lining material of the induction furnace should be added in batches, and the cloth is uniform and at the same time. The thickness of the lining material of the induction furnace is not more than 60 mm each time. , Until it is flush with the upper edge of the induction loop. After the knotting is finished, the crucible mold does not need to be taken out, so that the lining material of the induction furnace can perform induction heating during drying and sintering.

The baking and sintering process is roughly divided into two stages. In this way, the dense bonding structure of the lining material of the induction furnace is stronger.

The first stage of induction furnace lining material baking: heating to 100°C at a rate of 50°C/h, holding for 2h, heating at a rate of 100°C/h to 300°C, holding for 2h, the purpose is to completely remove the moisture in the furnace lining .

The second stage of sintering the lining material of the induction furnace: heating at 200℃/h to 900℃, holding for 2h, heating at 100℃/h to 1200℃, holding for 2h, the first furnace of molten steel at 1400-1650°C, holding for 1 hour, control The heating rate prevents cracks.