Iron chains are generally classified into two main categories according to their use: jewelry chains and industrial chains.
Industrial chains are further classified by strength grade, such as grade 30, 43, 60, 80, and 100. Additionally, they can be classified by function into drive chains, conveyor chains, traction chains, and special-purpose chains.
In terms of specifications, chain parameters include pitch and ultimate tensile load. Surface treatments include polishing, blackening, impregnation, plastic coating, and electroplating to suit different environments.
For example, grade 80 lifting chains are made of high-strength manganese steel, and the production process follows international standards such as ISO3077, EN818, and AS2321.