The application of metallurgical crane is generally applicable to the ambient temperature from - 10 C to + 50 C, and the relative humidity does not exceed 50% at 40 C. In the workshop with high environment temperature, the H-class insulated motor is used when the environment temperature is over 40 C and the high temperature radiation part is directly set up with heat insulation board. The radiation temperature of the lifted molten metal to the forging hook and plate hook is not more than 300 C. The high level of work is used in the relatively busy metallurgical foundry.