With the continuous use of ductile iron pipes in our daily lives and our understanding of their excellent characteristics, the application of ductile iron pipes has become more widespread. The uniqueness of ductile iron pipes in processing has led us to have a better understanding of their compressive strength.
Furthermore, the corrosion resistance of ductile iron pipes is constantly improving. In the process of processing the exterior of today's ductile iron pipes, galvanizing and adding cement lining inside make our ductile iron pipes better suited for use in our daily lives. It is precisely because of the continuous improvement of the corrosion resistance and unique hardness of ductile iron pipes that the application of ductile iron pipes in our lives has become more widespread.
Furthermore, due to its unique flexible drainage outlet, ductile iron pipes are of great help for sewage discharge pipes in daily life. For example, the sewage discharged from high-rise buildings is also widely used in the application of ductile iron steel pipes. Finally, the application of ductile iron steel pipes is very extensive, so it is inevitable that some flushing phenomena may occur. Therefore, ductile iron steel pipes have higher strength, lower noise, and higher waterproof performance when in use. Therefore, it is necessary to have a good understanding of the excellent characteristics of ductile iron pipes.
Ductile iron pipes are an alloy of iron, carbon, and silicon, in which carbon exists in a spherical free state, possessing the essence of iron and the function of steel. Ductile iron pipes cast by centrifugal method have a diameter between DN100 and DN2200. However, due to the difficulty and relatively high cost of casting ductile iron pipes with DN ≥ ->1200mm and DN ≤ 400 mm, as well as the thin wall and simple deformation of the socket and plug ends of large-diameter ductile iron pipes, which affect pipeline laying, ductile iron pipes were suitable for use within DN400 mm~1000mm at that time. The pipeline has the following obvious characteristics:
(1) The internal water pressure that ductile iron pipes can withstand can reach 3.0 MPa, and their elongation, stiffness, and tensile strength are all relatively high;
(2) Thoroughly standardized pipe fittings, able to adapt to various equipment needs;
(3) The interface of ductile iron pipes is generally selected as a socket, which is a flexible interface that is easy to disassemble and assemble. It can withstand some sinking and can be repaired with a small amount of residual water inside the pipe;
(4) Ductile iron pipes are generally coated with a zinc layer for external anti-corrosion, followed by asphalt protection. The pipe wall is lined with cement mortar, which has stronger corrosion resistance than steel pipes but weaker than non-metallic pipes;
(5) Generally, it has a lifespan of 50 years, which is longer than the lifespan of steel pipes. When using ductile iron pipes, attention must be paid to the anti slip and detachment issues at the flexible interface of the pipeline.
Usually, the presence of graphite flakes in cast iron has low strength, so there are many voids equivalent to iron sheets. Therefore, cast iron usually has relatively low strength and is more brittle. In ductile iron, graphite balls are equivalent to many spherical voids in cast iron. The influence of spherical voids on the strength of cast iron is much higher than that of sheet-like small spaces, so the strength of ductile iron is much higher than that of ordinary cast iron.