Heavy-duty ductile iron storm drain grating covers are core drainage safety components for heavy-duty applications such as urban main roads, highways, and industrial parks. Their high strength, high toughness, and high safety have made them a standard feature of road infrastructure.
I. Definition and Positioning
Heavy-duty ductile iron storm drain grating covers (commonly known as storm drain grates/ditch covers) are municipal castings installed at road storm drain inlets, serving multiple functions including drainage, load-bearing, fall prevention, anti-slip, and anti-theft.
Rapidly drains standing water from roads to prevent flooding.
Ensures the safety of vehicles and pedestrians, eliminating the risk of cover plate breakage, bouncing, and displacement.
Municipal main roads, highways, freight yards, docks, heavy-duty factory areas.
II. Key Materials and Processes
Mainly uses QT500-7 / QT450-10 ductile iron.
Tensile strength >=420MPa, close to low-carbon steel.
Elongation >=7%, toughness far superior to ordinary gray cast iron.
Spheroidal graphite structure, impact-resistant, fatigue-resistant, and not easily brittle.
Spheroidizing treatment: Adding magnesium / rare earth spheroidizing agents, graphite is distributed in a spherical shape.
Sand casting / resin sand casting: High dimensional accuracy and structural stability.
Anti-corrosion treatment: Asphalt coating, electrostatic spraying, galvanizing, improving weather resistance.
Fine machining: Tight seal between cover and seat, eliminating abnormal noise and bouncing.
III. Load-bearing capacity
Road heavy-duty products must meet the following requirements. EN124 or GB/T 23858 Standards:
D400 Class:
Test load 400kN (approximately 40 tons), suitable for urban main roads and highways.
E600 Class:
Test load 600kN (approximately 60 tons), suitable for freight stations and docks.
F900 Class:
Test load 900kN (approximately 90 tons), suitable for airports and heavy industrial areas.
Lightweight (A15/B125) vehicles are strictly prohibited from use on motor vehicle lanes, as they are prone to breakage and could cause safety accidents.
IV. Selection and Installation Key Points
Select Grade Based on Scenario: D400 or higher is mandatory for lanes.
1
Net width, depth, and installation edge width of the trench opening must be consistent.
2
Base must be compacted, mortar fully applied, and the cover must be flat and free of warping.
3
Use anti-theft locks and anti-detachment slots to prevent loss or warping.
V. Industry Value Summary
Heavy-duty ductile iron storm drain grating covers provide dual protection for road safety and urban drainage:
Replaces steel with iron, achieving the required strength at a lower cost.
Eliminates road "hidden killers" such as cover breakage, collapse, and bouncing.
Long lifespan, low failure rate, significantly reducing road safety maintenance costs.
+8618334738900
Email: info@jthypipe.com, amy@jintaicastfoundry.com, sales@jintaicastfoundry.com