The crucible of the medium-frequency induction furnace has the
following characteristics
(1) Higher melting point. The steel-making crucible requires a
melting point of 1700℃.
(2) Stable physical properties. The crucible products are required
to be resistant to the erosion of slag and molten steel.
(3) It has excellent thermal shock resistance and high temperature
strength.
(4) It has certain insulation properties.
(5) Lower thermal conductivity.
(6) Low cost, **.
2. Common classifications of refractory materials used for
manufacturing crucibles: There are three types: magnesia,
magnesia-alumina spinel, and quartz sand. Among them, magnesia can
be further divided into ordinary sintered magnesia, hot-selection
magnesia (high-quality sintered magnesia), seawater magnesia, and
electrically fused magnesia. The commonly used additive is boric
acid (H3BO3), which serves to lower the sintering temperature of
the sand, promote the synthesis of magnesia-alumina spinel, and
change the volume change rate of the crucible.
3. According to the properties of the refractory materials used in
the crucibles, there are three types of crucible refractory
materials: acidic, alkaline and neutral.
