Manganese steel is the basic material for producing 80 -level lifting chains. Manganese steel is abbreviated, and the full name is 20mN2A or 25mNV. These two materials are basic materials. Generally speaking, 20mn2 is used as basic materials under 16mm, and manganese steel T8 -level lifting chains are used as a basic material for 16mm or more. The manganese steel lifting chain is different from the iron chain. Although it does not see much difference in appearance, the strength and toughness are very different. It is recommended to use manganese steel chains for starting rear.