Ductile Cast Iron Single Grate (Trench Cover)

I. Technical Features

1. Material & Process

Ductile Iron Substrate: Spheroidal graphite distribution via magnesium/rare-earth treatment, tensile strength ≥420 MPa, elongation ≥10%, offering superior strength, toughness, and dynamic load capacity vs. gray cast iron (HT250).

Anti-Corrosion Process:

Zinc Spray + Asphalt Coating: Zinc layer ≥80 μm + asphalt overlay, salt spray resistance ≥1,000 hours (ASTM B117), suitable for pH 5–9 soil and humid environments.
Epoxy Resin Coating (Optional): Acid/alkali resistance (pH 3–11), ideal for chemical plants and high-corrosion zones.

2. Structural Design

Anti-Slip Surface: Diamond, fish-scale, or groove patterns (friction coefficient ≥0.65) ensure slip resistance in rain/snow.
Modular Splicing: Standardized sizes (e.g., 500×300 mm, 600×400 mm) enable rapid multi-unit assembly for varying trench lengths (e.g., 10+ meters).
Load Reinforcement: Bottom rib structure supports load ratings from C250 (25 tons) to D400 (40 tons), meeting pedestrian and vehicular demands.

II. Core Advantages

1. Ultra-High Strength & Impact Resistance

Compressive strength 400–600 MPa, withstands repeated heavy vehicle loads (e.g., D400 fire trucks) without deformation.
Fatigue resistance: Passes 2 million dynamic load cycles (EN124), suitable for high-traffic zones (e.g., highway rest areas).

2. Corrosion Resistance & Longevity

Anti-corrosion coating + ductile iron substrate resists salt spray, acid rain, and de-icing agents, lifespan ≥30 years (2–3× longer than composites).
Temperature range: -40°C to +350°C, freeze-thaw resistant for arctic (Northeast China) or tropical regions (Southern China).

3. Anti-Theft & Safety

Non-recyclable material + snap-fit/bolted fixation reduces theft by 85%.
Bar gaps ≤15 mm (EN124 standard) prevent small item drops (e.g., phones, keys), ensuring pedestrian safety.

4. Cost Efficiency & Easy Maintenance

Rapid installation: Modular design eliminates welding; single-person assembly boosts efficiency by 50%.
Low maintenance: Routine cleaning with high-pressure water; no rust-proof coatings; 40% lower lifecycle costs vs. gray cast iron.

III. Applications

1. Municipal Roads & Transport Hubs

Urban roads, auxiliary drainage (e.g., Beijing West 2nd Ring Road upgrades).
Airport runways, railway platforms: Heavy-duty load compliance.

2. Industrial Parks & Commercial Zones

Chemical plant drainage: Epoxy-coated grates for pH 3–12 environments.
Commercial plaza hidden drainage: Stone-textured or green-covered surfaces for aesthetic integration.

3. Special Environments

Coastal zones: Zinc spray + polyurethane coating resists chloride ions.
Arctic regions: Insulated base layers prevent frost heave damage.

IV. Standards & Selection Guidelines

International: EN124 (load rating), ISO1083 (ductile iron).

China:

GB/T23858-2009 (manhole covers).
CJ/T511-2017 (ductile iron covers).

Selection Criteria:

Load matching: C250 (25 tons) for sidewalks; D400 (40 tons) for roads.
Anti-corrosion: Epoxy for coastal/chemical zones; zinc + asphalt for general areas.
Supplier qualifications: ISO9001-certified manufacturers.

Summary

The ductile iron single grate (trench cover) sets the benchmark for linear drainage systems with its high strength, efficient drainage, and low lifecycle costs. Key strengths:

1. Heavy-Duty Endurance: 40-ton load capacity for high-traffic zones.
2. Drainage Revolution: V-shaped drainage + modular design for rapid flow and easy maintenance.
3. Full-Lifecycle Economy: 25-year lifespan, 50% lower costs vs. composites.
This product is an efficient drainage solution for urban roads, transport hubs, and industrial parks, particularly suited for projects demanding extreme load capacity, durability, and sustainability.

Technical Parameters: