The AP1000 main pipeline developed with Taihai Nuclear Power and Anshan Iron and Steel Co., Ltd. has realized mass production, passed the license certification of the National Nuclear Safety Administration, and has been installed and applied in Haiyang and Sanmen units. This is a major breakthrough in the production technology of China's main pipeline, and also lays a foundation for the production technology of Hualong No. 1, AP1400, AP1700 and other independent stacking main pipelines.