Electromagnetic crane is device that uses electromagnets to carry steel materials. The main part of electromagnetic crane is an electromagnet. When the current is turned on, the electromagnet will firmly attract the steel object and lift them to the designated place. Cut off the current , the magnetism disappears, and the steel object will drop. Electromagnetic cranes are very convenient to use , but they must have electric current before they can be operated. They are mainly used in scrap steel recycling departments and steelmaking workshops.