D400 Hinged Round Ductile Iron Manhole Cover 40 Ton Load Capacity with ISO9001 Certification for Urban Roads
| Load Class | Maximum Load | Application Scenarios |
|---|---|---|
| A15 | ≤1.5 tons | Pedestrian-only areas, green spaces |
| B125 | ≤12.5 tons | Sidewalks, non-motorized paths |
| C250 | ≤25 tons | Parking lots, residential roads |
| D400 | ≤40 tons | Urban roads, highways |
| E600 | ≤60 tons | Heavy-duty industrial zones, ports |
| F900 | ≤90 tons | Extreme heavy load areas like airports and container yards |
Used for drainage manholes on urban roads, main roads and highways to ensure smooth water flow while protecting safety.
Protects underground pipe network facilities for water supply, drainage, power, gas, and communications.
Covers sewers or inspection wells in communities, providing both functionality and aesthetics.
Covers underground equipment wells in factories and industrial parks with high-strength design.
- Raw Material Preparation: High-quality pig iron and scrap steel melted in electric furnaces with spheroidizing and inoculation treatments
- Modeling Stage: Precision mold making using sand casting techniques
- Casting and Molding: Controlled pouring of molten iron with careful cooling
- Cleaning and Grinding: Removal of excess sand and surface finishing
- Heat Treatment: Annealing to improve material toughness
- Surface Treatment: Sandblasting and protective coatings for corrosion resistance
- Quality Control: Rigorous testing of dimensions, appearance, and mechanical properties
- Final Assembly: Matching covers with frames and packaging
- Custom Options: Anti-slip textures, logos, or smart sensor integration available
SND has 20 years of experience manufacturing metal goods using advanced techniques including sand casting, lost wax casting, and precision machining. We work with various materials including cast iron, steel, stainless steel, and aluminum.
Our ISO9001:2015 certified facilities serve multiple industries including automotive, rail transportation, agricultural machinery, construction, and utilities. We implement comprehensive quality control with spectrometer, ultrasonic, and mechanical testing.
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