Characteristics of K9 Ductile Iron Pipes

Ductile iron achieves uniform spherical graphite distribution through spheroidization treatment, enhancing material strength. Its tensile and compressive strength far surpasses that of ordinary cast iron pipes, with tensile strength exceeding 420 MPa and the ability to withstand working pressures above 1.6 MPa. This characteristic enables the pipes to effortlessly withstand high water pressure impacts, soil pressure, and traffic loads. Even in complex geological conditions with deep burial, they maintain structural stability, effectively reducing the risk of deformation or rupture to ensure long-term safe system operation.

The spheroidal graphite structure endows the pipe with exceptional ductility and impact resistance, absorbing external energy and dispersing stress to prevent brittle fracture. Additionally, the pipe features a socket-type flexible joint design that accommodates displacement and deformation caused by foundation settlement and environmental temperature changes, maintaining pipeline integrity. This resilience enables K9 pipes to serve reliably in harsh environments while minimizing maintenance requirements.

Comprehensive anti-corrosion measures are applied to both pipe interiors and exteriors: Internal cement mortar lining (ordinary cement/high-alumina cement) isolates against fluid corrosion and prevents scale buildup, suitable for acids, alkalis, brine, and other media. while the outer wall features dual protection through a zinc spray layer and asphalt paint coating, resisting electrochemical corrosion from soil and groundwater. K9-grade ductile iron pipes compliant with national standards offer a service life exceeding 50 years, significantly reducing replacement costs and achieving a balance between economy and reliability.