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Before using the heat treatment pit furnace, the casting crucible must be cleaned to remove surface oil, rust, slag, and oxides, etc. To prevent...Bain-MarieCast iron crucibles have iron dissolved into the alloy; the crucible should be preheated to 150-200°C, coated with a layer of paint on the working surface, and then heated to 2000-300°C to completely remove moisture from the paint.

The crucible melting tool should be cleaned of surface debris before use, and the parts in contact with metal must be preheated and coated. The tool must be free of moisture to prevent molten splash and explosion.