Ductile Cast Iron Round Drainage Grate

Why Choose Our Ductile Iron Grate?  

"Not all cast iron is ductile iron!"  

Compared to brittle gray iron grates or aging-prone composite plastic grates, QT500-7 ductile iron delivers a revolutionary leap in compressive strength, impact resistance, and durability—with 40% lower lifecycle costs—thanks to its balanced strength and flexibility.  

I. Technical Features  

1. Material & Process  

   - Ductile Iron Substrate:  

• Magnesium/rare-earth spheroidization ensures spheroidal graphite distribution.  
• Tensile strength ≥420 MPa, elongation ≥10%, impact toughness ≥12 J/cm² (far exceeding gray iron).
• Density: 7.3 g/cm³ (non-recyclable, inherently theft-resistant).  

Anti-Corrosion Process:  

• Triple protection: Zinc spray (≥80 μm) + asphalt coating + epoxy pore sealing.  
• Salt spray resistance ≥2,000 hours (ASTM B117), pH 4–12 compatibility.  

2. Hydrodynamic Structural Design  

• Swirl-Type Grate Bars: Radially arranged curved bars (gaps ≤15 mm) concentrate water flow toward the center, boosting drainage efficiency by 40% (flow rate ≥45 L/s·m²).  
• Anti-Clogging Optimization: Gradual slot spacing (8 mm edges → 15 mm center) traps large debris while minimizing blockages.  
• Self-Cleaning Slope: Micro-inclined surface (0.5°–1°) enables rainwater to flush away silt, extending maintenance intervals by 50%.  

II. Core Advantages & Highlights  

① Ultra-Strong Load Capacity & Safety  

• Material: QT500-7 ductile iron, tensile strength ≥500 MPa, elongation ≥7%, superior impact toughness.  
• Load Rating: GB D400 grade (40-ton load), passes heavy-vehicle rolling tests.  
• Structure: Reinforced rib grid + anti-slip textures (serrated/ripple patterns), wet friction coefficient >0.8.  

② High-Efficiency Drainage  

• Open area ≥23%: Optimized hole distribution prevents surface ponding.  
• Slot gaps ≤25 mm: Effectively intercepts debris, simplifying maintenance.  

③ Long-Term Corrosion Resistance  

• Coating: Hot-dip galvanizing (≥80 μm) + asphalt coating.  
• Weather resistance: Stable from -30°C to +150°C; >1,000-hour salt spray test.  
• Design lifespan: ≥30 years (normal conditions).  

④ Safety & Ergonomics  

• Anti-drop structure: Optional 304 stainless steel mesh (load ≥100 kg).  
• Anti-theft locking: Concealed hinges/bolt locks deter 80% of theft attempts.  
• Noise reduction: Rubber gaskets eliminate vehicle impact noise.  

III. Applications  

• Municipal Works: Urban roads, bike lanes, greenbelt drainage.  
• Public Facilities: Airports, ports, railway stations, large plazas.  
• Residential/Commercial: Community roads, garage entrances, landscaped walkways.  
• Industrial Zones: Logistics parks, factory roads, warehouses.  

IV. Standards & Certifications  

International: EN124 D400 (load), ISO1083 (material).  

China:  

• GB/T 23858-2009 Manhole Covers.  
• CJ/T 327-2010 Reclaimed Water Grates.  

Certifications:  

• SGS salt spray test report (>3,000 hours).  
• Recommended by China Municipal Engineering Association.  

Summary  

The ductile iron round drainage grate revolutionizes urban drainage with military-grade load capacity, 30-year maintenance-free operation, and stormwater management excellence. Key strengths:  

• 1. Drainage Revolution: V-shaped diversion + self-cleaning design eliminates flooding during extreme rainfall.  
• 2. Ultimate Heavy-Duty King: 40-ton load capacity outperforms peers.  
• 3. Lifecycle Economy: 50% lower maintenance costs; 3× lifespan of gray iron.  

This product is indispensable for flood control, transport hubs, and high-load zones, particularly suited for scenarios demanding uncompromising reliability and durability.