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我国用普通灰口铸铁,以立式连铸法生产铸铁管,国外采用球铁,以金属型离心铸造法生产铸铁管;国外采用柔性接口,国内从刚性接口逐渐向柔性接口过渡;国外采用水泥砂浆衬里,国内大多数厂家采用焦油沥青涂料。相比之下,与国外差距较大。文内详细叙述了发展离心铸造球铁管的意义,球铁管取代灰铁管的必然性,用离心铸造法生产球铁管的工艺方法等。在连铸管方面,提出了生产小口径微稀土灰铁管,中口径蠕墨铸铁管,大口径铸态球铁管的方法及提高质量的途径。在接口方面论述了刚性与柔性接口的各自性能,建议逐步向柔性接口过渡,并提出了不同管径的管子应采取的接口型式。在防腐方面提出了采用水泥砂浆衬里的建议。
China uses ordinary gray cast iron to produce cast iron pipes by vertical continuous casting and ductile iron to foreign countries to produce cast iron pipes by metal centrifugal casting. In foreign countries, flexible interfaces are used to gradually transition from rigid interfaces to flexible interfaces. In foreign countries, Mortar lining, the majority of domestic manufacturers using tar paint. In contrast, the gap with foreign countries. The article described in detail the significance of the development of centrifugal casting ductile iron pipe, ductile iron pipe to replace the inevitable gray iron pipe, centrifugal casting method of producing ductile iron pipe process. In the aspect of continuous casting pipe, a method of producing small caliber micro-rare earth gray iron pipe, medium caliber vermicular graphite cast iron pipe and large caliber cast ductile iron pipe and a way to improve the quality are put forward. In the aspect of interfaces, the respective performances of rigid and flexible interfaces are discussed. It is suggested to gradually transition to flexible interfaces and to propose the interface types that should be adopted for tubes with different diameters. Proposed cement mortar lining in terms of corrosion protection.