Nodular cast iron pipe

The utility model provides a nodular cast iron pipe, which relates to the technical field of pipelines and comprises a nodular cast iron pipe body, a built-in iron pipe is connected inside the nodular cast iron pipe body, and nickel layers are uniformly arranged on the inner wall of the built-in iron pipe. The built-in iron pipe is arranged in the nodular cast iron pipe body, so that the nodular cast iron pipe body is isolated from the internal environment, the purpose of impact resistance is achieved, large impact load can be borne, the protection effect of the nodular cast iron pipe body is improved, and the nickel layer is arranged on the inner wall of the built-in iron pipe. A layer of ultra-thin passivation film is formed in the built-in iron pipe, the corrosion resistance of the built-in iron pipe is improved, and the use effect is high. 本实用新型提出了一种球墨铸铁管，涉及管道技术领域，包括球墨铸铁管管体，球墨铸铁管管体内部连接有内置铁管，内置铁管的内壁均匀设有镍层；本装置通过在球墨铸铁管管体内部设置内置铁管使得球墨铸铁管管体与内部环境隔离，从而达到耐冲击的目的，能够承受较大冲击载荷，提高球墨铸铁管管体的保护效果，又在内置铁管的内壁设有镍层，使得内置铁管内部形成一层极