Ductile Cast Iron Standard Square Manhole Covers Ductile Cast Iron Products

Ductile Iron Standard Square Manhole Covers - Strength, Durability, and Eco-Friendly Design

ManufacturingProcess&StructuralDesign

Material&Process

MaterialProperties:Ductileironundergoesmagnesium/rare-earthnodularization,creatingsphericalgraphitedistributionforexceptionalstrength(tensilestrength≥420MPa)andtoughness(elongation≥10%),farexceedinggraycastiron.

CastingProcess:Producedviaresinsandcastingorlost-foammethods,withsurfaceanticorrosiontreatments(zincspraying,epoxy,orasphalt)todelayrusting(servicelife≥30years).

StandardCompliance:MeetsEN124,GB/T23858,andotherinternational/nationalstandards,withloadclassesspanningC250(25tons)toE600(60tons).

StructuralDesign

SquareGeometry:Matchessquareopeningsortrenches,integrateswithlineardrainagesystems,minimizesinstallationgaps,andreducesdebrisentrapmentrisks.

Anti-DisplacementDesign:Multi-pointlocks(e.g.,cornerbolts)orhingeconnectionspreventshiftingortheft.

Anti-SlipSurface:Diamond-patternedorgroovedtextureensuresfrictioncoefficient≥0.6,excellinginwet/snowyconditions.

ModularSplicing:Supportsmulti-panelconfigurationsforlarge-spantrenches(e.g.,2m×1mcombinations).

3.FunctionalCustomization

Markings:Customizableengravings(e.g.,"Gas,""Telecom"),areacodes,andloadratingsformaintenancemanagement.

NoiseReduction:Rubbergasketsornylonbuffersreducevehiclenoiseby10-15dB.

CoreAdvantages

1.Ultra-HighLoad&ImpactResistance

Compressivestrengthof400-600MPasupportsheavytrucksandmachinery(e.g.,E600-grade60-toncapacity),idealforportsandlogisticshubs.

PassesEN124drop-weighttestswithzerofracturing;impactresistanceexceedscompositesby3x.

2.Durability&CostEfficiency

Wearresistance3xhigherthanmildsteel;30+yearlifespanwithlowerlifecyclecostsvs.composites(nofrequentreplacements).

Minimalmaintenance(periodicanticorrosionrecoatingonly).

3.Anti-Theft&Safety

-Specializedtoolsrequiredforcornerlocks/hinges,reducingtheftby85%vs.grayiron.
-High-densitymaterial(7.3g/cm³)lacksscrapvalue,eliminatingtheftincentives.

4.EnvironmentalAdaptability

Temperaturerange:-40°Cto350°C;resistanttofreeze-thawcyclesandextremeclimates.
Anticorrosioncoatings(e.g.,zincalloy+polyurethane)withstandsoilpH5-10.

5.InstallationFlexibility

Squaredesignfitslineartrenches/cableducts,eliminatingretrofittingneeds.
Standardsizes(e.g.,500×500mm,600×600mm)compatiblewithexistingsquareframes.

Applications

1.Municipal&Transportation

Squaredrainagecovers(C250-grade)forsidewalks/non-motorizedlanes.
Highwayserviceareas/tunnelaccesspointswithfatigue-resistantdynamicloadcapacity.

2.Industrial&Energy

Heavy-dutyzones(E600-grade)inchemical/steelplantsforundergroundpipelineprotection.
Squareinspectioncoversforpower/telecomcabletrenches.

3.Commercial&PublicSpaces

Recesseddrainagecoverswithstone-liketexturesforplazas/subwaystations.
Retrofitsolutionsforagingcommunitysquareopenings,replacingfragileconcretecovers.

4.HarshEnvironments

Heat-resistantcoversforsteampipelineinspectionpitsinindustrialplants.
Coastalareaswithzinccoatingstoresistchloridecorrosion.

IV.Certifications&Standards

International:EN124(EUloadclasses),ASTMA536(USmaterialstandard).
ChinaStandards:
GB/T23858-2009"ManholeCovers"
CJ/T511-2017"DuctileIronManholeCovers"
GB/T19426-2018"DuctileIronManholeCoversforRoadsandBridges"(load,anticorrosion,anti-slipspecifications).
Certifications:CEMarking(EU),ISO9001,SGSSaltSprayTest(ASTMB117).

Load-Bearing Grades & Applicable Zones:

Choose the appropriate load-bearing grade for your application:

Group 1 (Minimum Grade: A15): Green belts, sidewalks, pedestrian areas, and motor vehicle-free zones.
Group 2 (Minimum Grade: B125): Sidewalks, non-motorized lanes, car parks, underground parking areas.
Group 3 (Minimum Grade: C250): Residential areas, alleyways, light vehicle zones, and areas near curbs.
Group 4 (Minimum Grade: D400): Urban main roads, highways, and expressways.
Group 5 (Minimum Grade: E600): Freight terminals, ports, and airports.
Group 6 (Minimum Grade: F900): Airport runways and other high-load zones.

ProductSpecifications: