The 80 -level manganese steel ring has a heavy chain different from the flat chain. The flat chain is mainly used in transmission. The ring chain is mainly applied to the lifting. Of course, some circular chains are used in transmission, such as cross -wheels, but they are only a small part. Most of the ring chains are applied to the application of a hanging heavy object, making suspension, and the application of the crane chain of hand -pour gourds and electric gourds. Manganese steel is the basic material of the 80 -level chain. The strength of high strength is up to standard. It is a common material for producing circles of heavy chains.