D400 Ductile Iron Double Layer Anti-Settlement Manhole Cover with 450 MPa Tensile Strength and 30+ Year Service Life

The ductile iron double-layer anti-settlement manhole cover is engineered to prevent ground settlement around manholes, ensuring the long-term stability of roads, pavements, and other surfaces. This heavy-duty infrastructure product is ideal for urban areas, highways, industrial parks, and locations requiring enhanced safety and durability.

• Double-layer structure ensures even load distribution between cover and surrounding surface
• Prevents settlement from heavy traffic or soft soil conditions
• Maintains proper road and pavement alignment

• Constructed from ductile iron (QT450-10 or QT500-7)
• Superior tensile strength and toughness compared to traditional cast iron
• Resistant to deformation and breakage under heavy loads

• Equipped with rubber seals or anti-vibration components
• Minimizes noise when vehicles pass over the cover

• Treated with hot-dip galvanizing, asphalt coating, or electrostatic spraying
• Protects against rust and harsh environmental conditions

• Optional locking mechanisms or hinged designs
• Double-layer structure provides additional reinforcement

• Modular design simplifies installation process
• Adjustable frame allows quick surface alignment
• Easy to inspect and maintain over time

SND has over 20 years of experience producing high-quality metal goods, specializing in various casting techniques including sand casting, lost wax casting, lost foam casting, and precision machining. Our comprehensive quality control system ensures all products meet ISO9001 standards through rigorous testing including spectrometer analysis, ultrasonic testing, magnetic inspection, permeability testing, elongation measurement, and tensile/yield strength evaluation.