In early Dec. 2002, φ105mmR3s mooring chain produced by Zhenjiang Anchor Chain Plant was successfully put into service, its production period is short, and the max length of single chain is 912m, weighing 220t. In the production process, the plant’s research institute and equipment department fully displayed functions, and the chain making workshop strictly complied with productive technology and operation instructions to ensure the production of high-quality chain to be finished elaborately and reliably.