Metallurgy cranes are usually applicable to ambient temperatures ranging from -10℃ to +50℃. In case the temperature is at 40℃ and the relative humidity is not more than 50℃, the molten metal hoisted by the metallurgy cranes will produce The radiation temperature to which the molten metal hoisted exposes the forged and plate hooks is not more than 300℃. The cranes with a high job class are applicable to relatively busy metallurgy foundries.