This standard specifies the technical requirements for the cementitious mortar lining of ductile cast iron pipes and their pipe fittings, including the proportion of mortar, construction technology and performance testing. It aims to improve the anti-corrosion ability and durability of pipeline linings. Proposed by the China Iron and Steel Industry Association, the National Steel Standardization Technical Committee is under the control, and the Xinxing Cast Pipe joint stock company and the Metallurgical Industry Information Standards Research Institute are responsible for drafting, which ensures the comprehensiveness and implementation of the standard.