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Help CenterSteel Pipe & Tube & Cast Tube，QT400-15、QT450-10、QT500-7、QT600-3、ZG230-450、ZG270-500、WCB、WCC
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1. Product Overview
Cast iron pipe is mainly produced by centrifugal casting process. Using high-quality pig iron, ductile iron and alloy cast iron as raw materials, the pipe is manufactured through high-temperature smelting, high-speed centrifugal casting, stress-relief annealing and precision finishing.
Different from rolled seamless pipes, precision pipes and welded pipes, cast iron pipes feature thick wall, dense microstructure, strong compression and impact resistance, excellent wear and corrosion resistance, high rigidity and non-deformation performance. With smooth inner lining and reliable sealing, they have an ultra-long service life and are widely used as heavy-duty pressure pipes for municipal water supply & drainage, sewage projects, fire protection pipe networks and industrial fluid transmission.
2. Core Product Advantages
Excellent Corrosion & Scaling ResistanceCast iron material has natural passivation anti-corrosion performance, resisting soil erosion and acid-base sewage corrosion. The smooth inner wall prevents scaling and maintains stable water flow for decades.
High Rigidity & Strong Anti-settlement CapacityThick wall structure provides high overall strength. The pipe is resistant to vehicle rolling, backfill pressure and foundation settlement, ensuring safe underground burial.
Good Seismic Performance & Zero Leakage SealingFlexible joint design adapts to slight foundation deformation and effectively avoids pipe dislocation and leakage.
Maintenance-Free & Ultra-Long Service LifeUnderground service life reaches 50–100 years with almost no maintenance required, greatly reducing overall project costs.
Low Fluid ResistanceSmooth inner wall reduces flow resistance, avoids sediment accumulation and improves water transmission efficiency.
3. Material Classification
Gray Cast Iron PipeCost-effective and highly corrosion-resistant, mainly used for municipal rainwater, sewage and low-pressure drainage pipelines.
Ductile Iron Pipe (Mainstream Grade)High toughness and tensile strength close to steel material. Excellent crack resistance, burst resistance and anti-settlement performance. Ideal for water supply, fire protection and high-pressure sewage projects.
Alloy Cast Iron PipeAdded chromium, molybdenum and nickel elements for high temperature resistance and strong chemical corrosion resistance, suitable for chemical sewage and high-temperature medium transmission.
4. Joint Type Classification
Type A Joint: Rigid flange joint for fixed indoor pipelines
Type B Joint: Standard flexible joint for general municipal engineering
Type W Joint: Light flexible joint for high-rise building drainage
Type T Socket Joint: Self-locking socket spigot joint with excellent sealing and anti-settlement performance
Pressure Grade: K9, C30, C40 (K9 is the mainstream for high-pressure municipal projects)
5. Executive Standards
Domestic Standard: GB/T 13295, GB/T 26081
International Standard: ISO 2531, EN 545, EN 598
6. Specification Range
Nominal Diameter: DN80 – DN2600
Pressure Grade: C25, C30, C40, K9
Standard Length: 6m, 8m, 12m
Wall Thickness: Standard thick wall, customized heavy-duty wear-resistant and anti-corrosion wall available
Working Pressure: 0.6MPa – 4.0MPa
7. Production Process
Raw material proportioning & smelting → High-speed centrifugal casting → Stress-relief annealing → Pipe end cutting & finishing → Internal & external anti-corrosion coating (bitumen paint / epoxy ceramic) → Hydrostatic pressure test → Air tightness inspection → Dimensional & visual re-inspection → Logo marking & packaging
8. Performance Characteristics
High pressure and burst resistance, suitable for municipal water supply and fire protection main pipelines
Resistant to acid, alkali, humidity and complex soil corrosion
Anti-seismic, anti-tensile and anti-settlement, effectively avoiding fracture and leakage
Smooth inner wall with low flow resistance, no siltation and no blockage
Fully compatible with flanges, sockets, expansion joints, elbows, tees and complete pipe fittings
9. Application Fields
Municipal Engineering: Urban tap water main pipes, secondary water supply, rain and sewage diversion pipe networks
Construction Engineering: High-rise building drainage, rainwater discharge, underground embedded pipelines
Water Conservancy Engineering: Farmland irrigation, water diversion and reservoir water transmission pipelines
Industrial Plants: Factory sewage, circulating water and process fluid transmission
Fire Protection Engineering: Municipal fire water delivery and high-pressure fire main pipe networks
10. Quality Inspection Standards
100% full hydrostatic pressure test for each pipe
Full inspection of appearance, wall thickness and pipe end precision
Spectral material analysis and mechanical performance sampling test
Anti-corrosion coating thickness and adhesion test
Complete factory certificates and inspection reports provided for project acceptance
11. Packaging Standards
Domestic Packaging
Pipe end protective gaskets + rubber protectors, anti-corrosion layer protection, steel strip binding and waterproof wrapping to prevent collision, paint peeling and end damage during transportation.
Export Seaworthy Packaging
Marine anti-rust treatment, fully sealed pipe end protection, steel frame reinforcement and multi-layer stretch film wrapping. Salt-fog resistant, extrusion-proof and collision-proof, suitable for long-distance container sea transportation.
12. Delivery Cycle
Regular stock sizes DN80–DN800: 1–3 working days
Medium & large diameter DN900–DN2000: 3–7 working days
Custom anti-corrosion, special pressure and non-standard specifications: 7–12 working days
Priority production available for large urgent orders
13. Delivery Terms & After-Sales Service
Support full truck, LTL and door-to-door delivery
International trade terms: FOB, CFR, CIF, EXW
Payment terms: Deposit in advance, balance before shipment
Complete technical documents provided for project inspection and acceptance
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