Focusing on the design, manufacturing processes, heat treatment techniques, and key quality control points for all types of standard and non-standard gears.
| Parameter | Specification / Range |
|---|---|
| Casting Process | Lost Foam Casting |
| Available Materials | Ductile Iron QT500-7, Gray Iron HT200 |
| Load Rating | D400 Class (EN 124), 400 kN Test Load |
| Structural Type | Double-Leaf Square Manhole Cover Assembly (Cover + Frame) |
| Annual Production Capacity | 50,000 tons (all casting products) |
| Weight Range | Customized according to drawings and specifications |
This EN124 D400 double-leaf square ductile iron manhole cover is a highly reliable pipeline accessory solution engineered for heavy-load traffic scenarios. Manufactured via the lost foam sand casting process with QT500-7 ductile iron as the core material, it delivers outstanding strength, toughness and fatigue resistance, with mechanical performance far superior to traditional gray iron manhole covers.
It adopts a double-leaf split structure: each single cover plate has reduced weight for easier manual lifting during inspection, and provides sufficient underground working space when fully opened. The checkered anti-slip surface improves traffic safety, while the dedicated anti-theft locking system and backside reinforcing rib structure enable the product to withstand a 400kN test load, meeting the demand for long-term heavy traffic on motor vehicle lanes.
Produced in strict compliance with EU EN 124 standard and Chinese GB/T 23858 standard, the product supports full customization of dimensions, surface markings, lock types and surface treatments. It is widely compatible with various underground pipeline inspection chambers, making it a premium manhole cover solution for municipal infrastructure, public utility projects and industrial sites.
| Parameter Item | Specification / Range |
|---|---|
| Casting Process | Lost Foam Sand Casting |
| Available Materials | Ductile Iron QT500-7, Gray Iron HT200 |
| Load Rating | D400 Class (EN 124), 400kN Test Load |
| Structure Type | Double-leaf square manhole cover assembly (cover plate + frame) |
| Annual Production Capacity | 50,000 tons (full product range of castings) |
| Weight Range | Customized per drawings and specifications |
| Dimensional Tolerance | Grade CT8-CT10 (ISO 8062) |
| Surface Treatment | Bituminous anti-corrosion coating, electrostatic powder coating, or original anti-rust finish |
| Machining Capacity | Fitting surface finishing, drilling, custom lock hole machining |
| Heat Treatment | Annealing (customized on demand) |
| Testing Equipment | Manhole cover compression tester, F20 spectrometer, metallographic microscope, hardness tester, universal testing machine |
| Applicable Standards | EN 124, GB/T 23858-2009, GB/T 25628-2010 |
| Delivery Documents | Material test report, dimensional inspection report, load test report, hardness record |
Custom from drawings, 3D models, or samples.
Casting structure evaluation and process design.
Integrated casting and CNC machining. Annual output: 50,000 tons.
Inspection reports with each delivery.
Scrap steel and iron auto-fed into furnaces, sorted by material grade.
CNC-machined steel/aluminum patterns and sand-pressed foam cores for lost foam process.
Three furnaces alternate for continuous melting with manual and secondary slag removal.
Sand-compacted molds closed and poured; foam cores vaporize as iron fills cavity.
Cooling, de-sanding, grinding, shot blasting, CNC finishing; optional painting and heat treatment.
Spectral, dimensional, mechanical, and load testing; palletized with strapping and film.
In-house casting and CNC machining eliminate coordination overhead between foundry and machine shop, ensuring tighter dimensional control and faster turnaround from pattern to finished part.
Every batch ships with material test reports, dimensional inspection records, and hardness data. Full traceability from incoming material to finished casting with retained samples per batch.
Controlled melting parameters, real-time spectral analysis, and standardized molding procedures ensure consistent mechanical properties and dimensional accuracy across production batches.
Full customization of patterns, text, and reinforcing structures. Exported to 9 countries including Spain, Israel, Jordan, Egypt, Algeria, Malaysia, Thailand, Japan, and Mexico. 7.74M RMB export value in 2023.
D400 heavy-duty ductile iron manhole covers fit high-frequency heavy traffic scenarios including urban main roads, expressways and ring roads. The double-leaf structure facilitates routine maintenance and emergency repair of underground pipelines, while the anti-slip surface and shock-absorbing noise reduction design guarantee road traffic safety and comfort, fully meeting the acceptance criteria of municipal infrastructure projects.
Widely used in inspection chambers for power cables, communication optical cables, water supply & drainage, gas, heating and other public utility pipelines. Surface markings and anti-theft lock solutions can be customized per the requirements of pipeline owners. The anti-fall structure effectively reduces O&M safety risks, adapting to various underground utility pipeline infrastructure projects.
Suitable for heavy vehicle-intensive areas such as industrial parks, logistics yards, ports, wharves and freight stations. The high-toughness ductile iron material boasts excellent impact and wear resistance, capable of withstanding long-term repeated rolling by forklifts, heavy trucks and container trailers, with a long service life and lower full-cycle operation and maintenance costs.
Applicable to traffic areas including commercial plazas, residential communities and public parking lots. The square double-leaf structure flexibly adapts to non-standard manhole sizes. The anti-corrosion surface treatment performs well in complex outdoor climates, and supports customized surface patterns and exclusive markings to align with the overall landscape and management needs of the project.
Yes. We support OEM/ODM from 2D/3D drawings or physical samples, including material and machining customization.
New samples usually ship in 25-45 days including pattern making, casting, and inspection. Volume schedules are confirmed after process freeze.
Main products include ductile iron manhole covers, grates, textile machine parts, excavator bucket teeth, valve castings, automotive parts, and gear reducer housings, manufactured to GB/T 23858-2009 and GB/T 25628-2010. Materials cover gray iron, ductile iron, and cast steel.
Yes. Equipped with F20 spectrometer, metallographic microscope, hardness tester, universal testing machine, and manhole cover pressure tester. Chemical composition, dimensional, hardness, and material certificates included.
MOQ depends on casting complexity and tooling requirements. Sample orders are accepted. Contact us with your drawings for a specific quotation.
Castings are stacked on wooden pallets with strapping; premium painted products are wrapped with protective film. Packaging is customized to product size and shipping requirements. Quality issues are addressed within 48 hours with repair, replacement, or refund solutions.
+86 184 3796 0706 
info@destinytrans.com 
