Nowadays, in the life and work of the city, a large amount of water supply and gas supply are needed to ensure people's normal daily life. Therefore, ductile iron pipes have become the best choice for natural gas and water supply companies. As a transportation pipeline, ductile iron pipes need to withstand long-term pressure tests and have good corrosion resistance. In terms of corrosion, cast iron pipes made of steel or other materials are not as effective as ductile pipes. At the same time, the performance is also higher in terms of strength, so it is the best choice to use ductile ink tubes in the transportation of natural gas.

In the production of ductile iron pipes, the metal castings are heated by the hot touch method. When the mold is rotating, the ductile iron pipe company coats a layer of paint or resin-coated sand on the inner wall, and allows the coating to dry and harden. Pouring molten metal into shape. Because there is a layer of paint or resin-coated sand on the casting mold, the cooling rate of the molten metal is greatly reduced, so that as-cast ductile iron pipes can be obtained, no high-temperature annealing is required, only low-temperature annealing at 720-760 ° C is required. Therefore, the casting pipe annealing equipment is simplified, the energy consumption is reduced, the service life of the metal casting mold (pipe mold) is improved, and the production cost of the casting pipe is reduced. However, the productivity is lower than that of the water-cooled metal molding method, and the quality of the inner and outer surfaces of the cast pipe is also slightly worse.