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Help CenterSteel Pipe & Tube & Cast Iron Pipe，HT150, HT200, HT250, QT400-18, QT450-10, QT500-7, QT600-3, ZG40Cr25Ni20Si2, ZG4Cr22Ni10
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Cast Iron Pipe is a kind of high-rigidity, corrosion-resistant and pressure-resistant industrial cast pipeline formed by high-temperature molten iron centrifugal casting and integral solidification. As a traditional and mature infrastructure pipe, Cast Iron Pipe features high structural strength, excellent stability, strong anti-settlement performance and long service life. Cast Iron Pipe is widely recognized for its reliable sealing, impact resistance and underground burial adaptability. Cast Iron Pipe is specially used for municipal water supply, drainage, sewage transportation, fire water delivery and buried fluid pipeline projects, and has become the preferred pipeline for long-term municipal infrastructure construction.
1. Product Classification & Core Functions
Cast Iron Pipe is scientifically classified according to material structure and casting process, covering municipal engineering, industrial drainage and special anti-wear transmission scenarios:
1.1 Grey Cast Iron Pipe
Grey Cast Iron Pipe adopts flake graphite cast iron material and continuous casting process. Grey Cast Iron Pipe has good shock absorption, excellent cutting performance and stable chemical corrosion resistance. Grey Cast Iron Pipe features low manufacturing cost and strong practicability, which is widely used in conventional municipal drainage, rainwater collection and general fluid transmission projects.
1.2 Ductile Cast Iron Pipe
Ductile Cast Iron Pipe is made of spherical graphite ductile iron after spheroidizing treatment. Ductile Cast Iron Pipe has greatly improved toughness, tensile strength and pressure resistance compared with grey cast iron pipes. Ductile Cast Iron Pipe can adapt to high-pressure water supply, foundation settlement and complex buried working conditions. Ductile Cast Iron Pipe is the mainstream high-standard pipe for urban water supply and large-scale pipeline engineering.
1.3 Centrifugal Cast Iron Pipe
Centrifugal Cast Iron Pipe is formed by high-speed rotating centrifugal casting technology. Centrifugal Cast Iron Pipe has uniform wall thickness, dense internal structure and fewer casting defects. Centrifugal Cast Iron Pipe has higher pressure bearing capacity and surface finish, suitable for medium and high-pressure fluid transmission and long-distance buried pipeline systems.
2. Production Process
All standard Cast Iron Pipe adopts high-temperature smelting and integral centrifugal casting process, with dense structure, uniform wall thickness and stable overall performance:
Raw material proportioning & melting (1400℃+ high temperature) → alloy spheroidizing treatment → high-speed centrifugal casting → water cooling solidification → pipe body shaping & finishing → heat treatment stress relief → internal and external anti-corrosion coating → dimensional inspection → pressure test & flaw detection → finished product packaging
The whole production process strictly controls molten iron composition, casting speed and cooling uniformity. Every Cast Iron Pipe has compact metallographic structure, no air holes, no sand holes and no cracks, ensuring long-term stable operation of buried pipelines. All types of Cast Iron Pipe maintain consistent high-standard manufacturing procedures to guarantee reliable engineering performance.
3. Material Grades & Performance Characteristics
Cast Iron Pipe adopts standardized cast iron materials with stable texture and qualified mechanical indicators, covering conventional and high-strength ductile series:
Grey Cast Iron Grade (HT150, HT200, HT250): Good rigidity, excellent vibration resistance and chemical stability. Suitable for low-pressure drainage, sewage and rainwater pipeline projects with stable working conditions.
Ductile Iron Grade (QT400-18, QT450-10, QT500-7, QT600-3): High tensile strength, excellent elongation and impact resistance. It can resist foundation deformation and external extrusion, suitable for high-pressure water supply and heavy-load buried pipelines.
Alloy Cast Steel Grade (ZG40Cr25Ni20Si2, ZG4Cr22Ni10): High temperature resistance, wear resistance and corrosion resistance, customized for special industrial high-corrosion and high-wear fluid transmission pipelines.
4. Complete Size Specifications
Cast Iron Pipe supports full standard size production and non-standard customization, with complete caliber range and stable structural parameters:
Nominal Diameter DN: DN80 – DN2600
Wall Thickness Range: 6mm – 35mm
Standard Single Pipe Length: 3m, 4m, 6m customizable fixed length
Working Pressure Grade: PN10, PN16, PN25, PN32 high-pressure customizable
Interface Type: T-type socket, flexible interface, flange interface, self-anchoring interface
Anti-Corrosion Treatment: Cement mortar lining inside, asphalt paint / epoxy coating outside
5. Executive Standards
National Standard: GB/T 3422-2008, GB/T 13295-2019
International Standard: ISO 2531, EN545, EN598
All Cast Iron Pipe are produced and inspected in strict accordance with national and international industry standards. Each batch of Cast Iron Pipe is equipped with hydraulic pressure test report, mechanical performance test certificate and complete factory qualification documents.
6. Product Advantages
1. Ultra-Long Service Life: Cast Iron Pipe has strong anti-aging and anti-corrosion ability, with a service life of more than 50 years for buried installation, far exceeding ordinary steel pipes and plastic pipes.
2. Strong Structural Stability: Cast Iron Pipe features high rigidity and compression resistance. It can resist soil settlement, vehicle rolling and external extrusion without deformation or fracture.
3. Excellent Sealing Performance: Flexible socket interface cooperates with high-quality rubber sealing ring. Cast Iron Pipe has good telescopic and deflection adaptability, effectively avoiding pipeline leakage.
4. Strong Anti-Corrosion Ability: Internal cement mortar lining and external anti-corrosion coating isolate medium erosion. Cast Iron Pipe adapts to humid underground, sewage and corrosive soil environments.
5. Easy Installation & Low Maintenance: Standard interface design of Cast Iron Pipe simplifies on-site construction. The product has stable performance and almost no later maintenance cost.
7. Application Fields
Cast Iron Pipe is widely used in municipal water supply and drainage projects, urban sewage treatment, fire protection water supply systems, industrial wastewater transmission, farmland water conservancy projects, underground buried pipe networks and long-distance fluid transportation pipeline projects.
8. Delivery Cycle
Conventional Standard Specifications: Conventional caliber and pressure grade Cast Iron Pipe are in stock, delivered within 3–5 working days.
Large Diameter & Special Interface: Large-diameter and special anti-corrosion customized Cast Iron Pipe, delivered within 5–10 working days.
Large-Batch Engineering Orders: Bulk project orders support priority production, with negotiable urgent delivery to meet construction progress requirements.
9. Packaging & Transportation Protection
Cast Iron Pipe adopts professional pipeline packaging: pipe end protection cover, buffer anti-collision pad binding, overall winding waterproof and dustproof film. Each pipe is marked with standard specification, grade and batch number. Strict packaging ensures that Cast Iron Pipe avoids collision damage, coating peeling and surface wear during long-distance transportation and hoisting.
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