D400 Hinged Round Ductile Iron Manhole Cover with ISO9001:2015 Certification for Urban Roads

• Road drainage systems: Used for drainage manholes on urban roads, main roads and highways to ensure smooth water flow while protecting safety.
• Municipal engineering: Protects underground pipe network facilities for water supply, drainage, power, gas, and communications.
• Residential areas: Covers sewers or inspection wells in communities, providing both functionality and aesthetics.
• Landscaping: Maintains drainage systems in parks, squares and green spaces.
• Industrial areas: Covers underground equipment wells in factories and industrial parks.
• Underground maintenance: Facilitates inspection and repair of underground pipe networks.
• Traffic safety: High-strength design withstands heavy vehicle pressure with anti-slip features for enhanced safety.

1. Raw material preparation: High-quality pig iron and scrap steel melted in electric furnaces with spheroidizing and inoculation treatments.
2. Modeling stage: Precision mold making using sand casting techniques.
3. Casting and molding: Controlled pouring of molten iron with careful cooling.
4. Cleaning and grinding: Removal of excess sand and surface finishing.
5. Heat treatment: Annealing to improve material toughness.
6. Surface treatment: Sandblasting and protective coatings for corrosion resistance.
7. Quality control: Rigorous testing of dimensions, appearance, and mechanical properties.
8. Final assembly: Matching covers with frames and packaging.
9. 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-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.