What is the ductile iron fittings, I believe there are a lot of people are not very understanding of the metal pipe in simple terms this is actually a kind of cast iron after using more than eighteen processing by centrifugal production. Because the metal pipe itself according to the advantages of Yo very much, so now whether it is in the construction of tap water pipe network, sewage or in the chemical medium conveying and so on in the process of using the iron pipe fittings are very common. But for how we can ensure the best effect, many people are not very understanding. In order to ensure the safety of use, while the ductile iron pipe laying, relevant personnel should pay attention to according to the freezing degree, external factors and so on load pipeline crossing to determine the buried depth of pipeline. In general, the ductile pipe buried deep Should the local frozen zero point two meters below the line, if the buried depth of light, so the service life of the pipeline and the use effect will not be guaranteed. But if the ductile pipeline buried too deep, so the pipeline cost will also be significantly improved.