Square Ductile Iron Manhole Cover China Factory and Wholesale Suppliers

Looking for high-quality square ductile iron manhole covers from a leading China factory? Our QT500-7 covers comply with EN124 and GB/T23858 standards, featuring anti-settlement and double-layer sealing. As professional suppliers, we provide customized load levels A15-F900 for municipal and industrial projects.

SupplierHandan Hengyi Metal Products Co., Ltd.www.hengyimanhole.com

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About this product

Product information from the supplier.

The Square Ductile Iron Manhole Cover is a high-performance access solution engineered for the casting and metal products industry. Manufactured from premium QT500-7 nodular cast iron, this product is designed to replace traditional gray iron covers by providing superior toughness and impact resistance, effectively eliminating the risk of brittle fractures under heavy mechanical stress.

Ideal for municipal engineering, industrial parks, and residential infrastructure, these covers are tailored for environments ranging from pedestrian sidewalks to heavy-duty airport docks. Procurement specialists should focus on the load-bearing classification (A15 to F900) and the specific structural design—such as anti-settlement or double-layer sealing—to ensure compatibility with the local roadbed and sewage requirements.

Detailed Parameters

Material	QT500-7 Ductile Iron (Nodular Cast Iron)	Standard Compliance	GB/T23858 and EU EN124
Load Levels	A15, B125, C250, D400, E600, F900	Available Sizes	500x500, 600x600, 700x700, 800x800, 900x900 mm
Surface Treatment	High-temperature asphalt rust prevention spraying	Sealing Option	Optional EPDM rubber silent sealing strip
Application	Power, Communication, Rainwater, Sewage, and Gas Wells	MOQ	Please contact the company for current minimum order quantity requirements.
FOB Pricing	Contact the company for the latest FOB quotation based on quantity.	Lead Time	Contact the company to confirm the current production and delivery schedule.

Key Advantages

Material Integrity

Using QT500-7 ductile iron ensures high toughness and resistance to deformation, preventing the cracks common in ordinary gray cast iron.

Extended Lifespan

High-temperature asphalt spraying provides a robust barrier against acid, alkali, and rainwater corrosion for long-term outdoor durability.

Safety Performance

Die-cast anti-slip patterns on the surface ensure pedestrian and vehicle safety during rainy or snowy weather conditions.

Noise Reduction

Optional EPDM rubber sealing strips eliminate the "bouncing" effect and crushing noise when vehicles pass over the cover.

Odor Isolation

Double-layer sealed structures effectively isolate sewer odors and exhaust gases, making them ideal for high-end residential projects.

Custom Flexibility

Support for non-standard sizes, custom logo reliefs, and anti-theft locks to meet specific municipal or project requirements.

Product Gallery

Management Platforms

Configuration Support

Technical assistance in selecting the correct load level (A15-F900) based on your specific site traffic data.

Quality Control

Strict adherence to EU EN124 and GB/T23858 standards with rigorous testing for load-bearing capacity.

Customization Desk

Direct coordination for non-standard size requests and personalized logo casting for municipal identification.

Order Management

Streamlined processing for wholesale orders with clear tracking from pouring to delivery.

Delivery Coordination

Optimized packaging and logistics to ensure heavy iron components arrive without surface damage.

Technical Support

Guidance on installation techniques, especially for anti-settlement wings and sealing strip maintenance.

Investment Return Comparison

Consideration	Standard Gray Iron	QT500-7 Ductile Iron
Structural Risk	Prone to brittle fracture	High impact resistance
Maintenance Cycle	Frequent replacement due to cracks	Long-term stability, low frequency
Operational Noise	High metallic clashing	Silent (with EPDM option)
Installation Value	Basic fit	Anti-settlement wing support
Procurement Logic	Lower initial cost, higher LCC	Balanced cost, lower life-cycle cost

Frequently Asked Questions

Q: What makes QT500-7 ductile iron superior to gray iron for manhole covers?

QT500-7 ductile iron possesses a nodular graphite structure that provides significantly higher toughness and impact resistance, preventing the sudden brittle failure often seen in traditional gray iron covers under heavy vehicle loads.

Q: How do I choose the correct load level (A15 to F900) for my project?

Selection depends on the usage area: A15 for green belts/lawns, B125 for pedestrian streets, C250 for community lanes, D400 for main municipal roads, and E600/F900 for heavy-duty sites like ports or airports.

Q: Can these covers be customized with a company logo or specific size?

Yes, customization is supported for non-standard sizes, logo reliefs, anti-theft locks, and specialized internal structures to meet unique project specifications.

Q: What is the minimum order quantity (MOQ) for these covers?

Please contact the company to confirm the current MOQ, as it may vary based on the load level, size, and customization requirements of your order.

Q: How can I obtain an FOB quotation for a bulk order?

Please contact the company's sales department with your required specifications, quantity, and destination port to receive a detailed and current FOB quotation.

Q: What is the typical production lead time for customized orders?

Lead times depend on the current production schedule and the complexity of the customization. Please contact the company for a confirmed delivery timeline for your specific order.