Hot-mold centrifugal ball cast iron pipe and production process thereof

Abstract

The invention provides a hot-mold centrifugal ball cast iron pipe and a production process thereof, and comprises a pipe body of a cast iron pipe, the inner layer of the pipe body of the cast iron pipe is coated with a base layer, and a protective layer is further arranged on the base layer; the base layer comprises the compositions of, by weight, 5-12% of copper powder, 8-22% of aluminum powder,3-8% of titanium dioxide, and the balance iron powder; the protective layer comprises the compositions of, by weight, 0.5-3% of curing agent, 3-12% of coal pitch, 10-20% of quartz powder, 0.03-3% of toughening agent, and the balance waterborne epoxy resin. According to the hot-mold centrifugal ball cast iron pipe and the production process thereof, energy is saved, environment is protected, production efficiency is improved, and elongation of cast pipes is increased.

Description

technical field [0001] The invention relates to a production process, in particular to a heat-molded centrifugal ductile iron pipe and a production process thereof. Background technique [0002] The ductile iron pipe produced by the cold molding method is a water-cooled pipe mold. After centrifugal casting, it is transferred to an annealing kiln for annealing treatment, and finally a ferrite matrix is ​​obtained, so that the elongation of the body is higher. The advantage is that the elongation rate of the cast pipe can reach the ISO2531 standard after annealing. Therefore, most manufacturers still use this method to produce ductile iron pipes. However, this method consumes a lot of pipe molds, requires a lot of pipe mold maintenance, and takes a long time to assist. [0003] The thermal molding method is to heat the pipe mold to 150°C-300°C, and spray heat-insulating paint on the inner wall of the pipe mold to protect it. After pouring, it does not undergo annealing treat...

AI Technical Summary

Problems solved by technology

However, this method consumes a lot of pipe molds, requires a large amount of pipe mold maintenance, and takes a long time to assist.

[0003] The thermal molding method is to heat the pipe mold to 150°C-300°C, and spray heat-insulating paint on the inner wall of the pipe mold to protect it. After pouring, it does not undergo annealing treatment. Its advantages lie in long service life of the pipe mold, small maintenance, and energy saving; disadvantages It is required to control the composition of molten iron in a narrow range, and the elongation rate of cast pipes in actual production is low, only about 5%.