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Cast iron manhole covers are divided into ductile iron manhole covers and gray cast iron manhole covers. Generally speaking, ductile iron manhole covers of the same weight have stronger pressure resistance than gray iron manhole covers. The material used for gray iron manhole covers is generally HT200, and the material used for ductile iron manhole covers is generally QT500-7.
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| Category | Specifications |
| Material Type | – Ductile Iron (QT500-7, commonly used) |
| – Gray Cast Iron (HT200/HT250, less common) | |
| Application Scenarios | Municipal roads, sidewalks, parking lots, green belts, airport runways, etc. |
| Load-Bearing Class | – EN124 Standard: A15/B125/C250/D400/E600/F900 |
| – Chinese Standard (GB/T 23858): Light/Standard/Heavy/Super Heavy Grades | |
| – ASTM C923 (U.S. Standard) | |
| Dimensions | – Round: Φ600mm, Φ700mm, Φ800mm (common) |
| – Square: 600×600mm, 700×700mm | |
| – Rectangular: Customized to manhole opening | |
| Structural Parameters | – Cover Thickness: 30mm~60mm (varies by load class) |
| – Unit Weight: 40kg~120kg | |
| – Frame Inner Diameter: Matches cover size (typically 10-20mm larger) | |
| Anti-Slip Design | – Surface Patterns: Diamond, linear, or raised dots |
| – Slip Resistance Coefficient: ≥0.6 (wet conditions) | |
| Anti-Theft Features | – Built-in hinges/hidden locking mechanisms |
| – Bolted fixation (requires specialized tools for opening) | |
| Drainage Holes | – Optional drainage holes (hole diameter/quantity customizable) |
| Surface Treatment | – Anti-rust painting (black, gray) |
| – Hot-dip galvanizing (enhanced corrosion resistance) | |
| – Epoxy resin coating | |
| Tolerances | – Diameter Tolerance: ±3mm |
| – Flatness Tolerance: ≤2mm/m² | |
| Compressive Strength | – Ductile Iron: ≥500MPa |
| – Gray Cast Iron: ≥200MPa | |
| Temperature Range | – Standard Use: -40°C ~ +80°C |
| Compliance Standards | – EN 124 (Europe) |
| – GB/T 23858-2009 (China) | |
| – ASTM C923 (U.S.) |
Shandong Baowu Steel Group Co., Ltd. located in Shandong, we have convenient transportation.our company is a large-scale enterprise specializing in the production of seamless steel pipes, welded steel pipes, stainless steel pipes and stainless steel products. We mainly produce including stainless steel plates/coils and profiles, Steel plate, alloy steel plate, wear-resistant steel plate,Carbon plate, square tube, galvanized tube, non-ferrous metal, PPGI and PPGL and other materials. Our company also has cooperative factories, like TPCO, TISCO, ZPSS, Tianjin Iron and Steel Group, HBIS Group, and Steel, Shandong Iron and Steel Group.We have rich experience in foreign trade and have established long-term cooperative relations with many well-known foreign companies.
We are a factory as well as a professional manufacturer established for more than 20 years and export over 15 years.
Can provide small samples for free. Customized sample takes 5-7 days.
Small trial order takes 5-7 days. Container order need 15-20 days.
Cover with PE film , wrap with waterproof paper, pack with wooden plate,belt by steel strip, fasten on pallet.
All products we supply is primary as you need, Our company is certificated to CE, and every product will be tested for 4-5processes. We welcome customers or the third party inspection agencies to come to our factory for inspection.
Usually 30% deposit by TT in advance and balance against copy pf BL or L/C at sight.
Become a leader in the global steel industry and jointly create a high-quality steel ecosystem. A steel company specializing in the production and sales of steel products.
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