What is the quality of ductile iron pipe?

- Sep 19, 2019-

What is the quality of the flexible ductile iron pipe as the name suggests? Of course, the silicon content determines the quality of the ductile iron pipe. The silicon content has a great influence on the mechanical properties of the ductile iron pipe. For example, silicon can change the size and distribution of the graphite ball. And roundness, can refine the graphite ball, which will increase the plasticity and strength of the matrix; Silicon can promote the decomposition of cementite during the annealing process, generate ferrite, improve the ductility and ductility of ductile iron pipe; silicon can also dissolve Strengthen the metal matrix in the iron to improve the hardness and strength of the ductile iron pipe. Therefore, the silicon in the ductile iron pipe is mainly added in a gestating manner. In order to better play the role of silicon, silicon is added in the form of three gestation in production: firstly, it is incubated in a spheroidized package, followed by gestation with a stream, followed by tube powder. And these three births have the best effect of instant gestation. Therefore, the silicon in the furnace before gestation is tempered to a suitable amount. The experiment shows that the silicon in the furnace is generally adjusted to 0.8-丨.2%. Between the two, if the silicon in the furnace is adjusted to less than 0.8^, more inoculant should be added in the spheroidized package. The molten iron after the spheroidal cast iron tube is cooled is too large, which is not conducive to pouring; The inner silicon is adjusted to be higher than 丨.2%, and the inoculant added in the spheroidized package is relatively reduced, so that the gestation effect is greatly reduced, and the silicon is burned in the high temperature furnace, and the reaction equation is The result of 51+2^01=5102 will reduce the amount of final silicon in the cast tube and affect the mechanical properties of the cast tube.https://www.xihuafoundry.com/