There are many types of round ring chains. They include iron chains and steel chains. Chains are also divided into lifting chains and decorative chains. For example, the chains on a swing are circular in shape, with each link interlocking. These chains can be distinguished based on their load-bearing capacity. Lifting chains rated at 80 tons are made of 20Mn2 manganese steel, which is commonly referred to as manganese steel chain, steel chain, alloy steel chain, or round ring chain, among other names. A 60-ton grade chain is made of Q235 material, which is an iron chain, and has a lower carrying capacity than the same specification lifting chains. Lifting cranes and hoisting rigging equipment use manganese steel lifting chains.