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I-section steel grating (also known as I-flat steel grating) is a high-strength grating component manufactured from I-profile flat steel as the load-bearing member, combined with twisted square bars (or flat bars), and formed by high-pressure resistance welding.
Its core advantages are excellent load-bearing capacity and high structural rigidity. The I-shaped cross-section greatly improves bending strength and deformation resistance compared with ordinary flat steel. Under the same material and specifications, its load-bearing capacity far exceeds that of conventional steel grating, while retaining the inherent properties of grating: good ventilation, drainage, anti-corrosion performance and durability.
Available materials include carbon steel and stainless steel, with welded construction. Dimensions, mesh openings and I-flat steel specifications can be fully customized.
I-section steel grating is widely used in heavy-duty, high-altitude and large equipment scenarios with strict load-bearing requirements, making it the preferred load-bearing paving material for industrial heavy-duty areas.
Load-bearing member (I-flat steel)
The main load-bearing component, made of rolled Q235 carbon steel or 304/316 stainless steel with a standard I-shaped cross-section. It features wide top and bottom flanges and a thick web, delivering outstanding bending, shear and deformation resistance with effective load distribution.
Cross bars
High-strength twisted square bars (standard) or flat bars, intersecting I-flat steel at 90° and firmly fused via high-pressure resistance welding to form open mesh, ensuring both rigidity and ventilation/drainage.
Auxiliary structures
Angle steel frames, intermediate stiffeners, pre-drilled mounting holes and mounting lugs can be added as required. For heavy-duty models, longitudinal reinforcing beams may be installed to further enhance overall load capacity and stability.
Anti-corrosion treatment
Hot-dip galvanizing (standard), electro-galvanizing, paint coating or natural stainless steel finish. Full anti-corrosion protection is applied to flanges, webs and welded joints to prevent structural degradation caused by rust.
Standard I-section steel grating
Welded from standard I-flat steel and twisted square bars with a simple structure. Load capacity exceeds ordinary steel grating, suitable for conventional heavy-duty applications such as factory heavy-duty platforms and equipment access walkways.
Serrated I-section steel grating
Continuous serrations pressed on the top flange of I-flat steel, providing enhanced load capacity plus excellent anti-slip performance. Ideal for heavy-duty and slippery environments such as port platforms and chemical industrial walkways.
Framed I-section steel grating
Equipped with a perimeter angle steel or flat steel frame, offering improved dimensional accuracy and deformation resistance. Suitable for precise paving and heavy rolling scenarios including heavy equipment covers and vehicle access platforms.
Custom heavy-duty I-section steel grating
Custom I-flat steel specifications, mesh spacing, plus additional stiffeners and longitudinal beams to meet ultra-heavy-duty requirements for equipment maintenance platforms, port and terminal loading platforms, etc.
Raw material processing
Cutting of Q235/stainless steel I-flat steel and twisted square bars. For serrated types, uniform serrations are pressed with controlled dimensional tolerance within ±1mm.
Grating forming
I-flat steel and twisted square bars are arranged at preset spacing and joined by high-pressure resistance welding to ensure firm fusion, free of incomplete welding, missing welds or detachment, with smooth and full weld joints.
Auxiliary machining
Welding of frames, stiffeners and longitudinal beams; drilling of mounting holes and lugs; grinding of welds and edges to remove burrs for safe usage.
Anti-corrosion treatment
Hot-dip galvanizing (coating thickness ≥85μm), painting or stainless steel polishing to ensure full corrosion protection of flanges, webs and welds for extended service life.
Finished product inspection
Verification of dimensions, mesh spacing, I-flat steel specifications, welding integrity, load performance and anti-corrosion effect. Load testing is performed to meet heavy-duty standards and customer requirements before delivery.
Extremely high load-bearing capacity
Scientific I-shaped cross-section provides superior bending and shear resistance. Load capacity is 30%–50% higher than ordinary steel grating under identical specifications, suitable for heavy equipment and vehicle rolling.
High structural rigidity & low deformation
Wide flanges ensure even stress distribution. Reinforced by cross bars, the grating features high rigidity, resistance to warping, deformation or fracture under long-term heavy loads.
Open & durable design
Maintains open grating structure for fast drainage, sludge removal, ventilation and heat dissipation, reducing water and dust accumulation. Excellent corrosion resistance supports long service in harsh environments.
Anti-slip & safe
Optional serrated surface greatly increases friction and prevents slipping under heavy loads. All edges are deburred for safe handling and usage.
Flexible customization & wide adaptability
Fully customizable I-flat steel sizes, mesh spacing, materials and surface treatments. Reinforced structures can be designed for specific heavy-duty conditions and installation spaces.
Easy installation & low maintenance
Supports welding or mounting clamp installation with pre-drilled holes and lugs for high efficiency. Only regular cleaning and weld inspection are required, resulting in low maintenance costs.
Q235 Carbon Steel
Standard material with high cost performance, usually hot-dip galvanized, suitable for general heavy-duty platforms in factories and industrial zones.
304/316 Stainless Steel
Acid-resistant, corrosion-resistant and anti-oxidation, ideal for heavy-duty and highly corrosive environments such as chemical plants, coastal facilities and wastewater treatment stations.
Cross bar material
High-strength twisted square bar (standard), flat bar (optional for enhanced rigidity).
Frame material
∠50×5, ∠63×6 heavy angle steel or I-flat steel (preferred for heavy-duty models) to improve structural stability.
I-flat steel: Height 32mm, 40mm, 50mm, 65mm, 80mm; web thickness 4mm, 5mm, 6mm, 8mm; flange width 15mm, 20mm, 25mm.
Serrations (serrated type): Tooth height 1.5–2.5mm, pitch 15–20mm, ≥5 teeth per 100mm.
Mesh openings: Standard 30×100mm, 40×100mm, 50×50mm; smaller openings (e.g. 20×80mm) available for heavy-duty models.
Panel size: Standard 1m×2m, 1.2m×2.4m; custom non-standard sizes up to 3m×6m.
Load rating: Maintenance platform ≥10kN/m²; heavy-duty ≥20kN/m²; extra-heavy-duty ≥30kN/m² (customizable).
Industrial heavy-duty areas
Heavy equipment maintenance platforms and walkways in chemical plants, power stations and mines; high-temperature heavy-duty platforms in metallurgical and forging workshops.
Ports & terminals
Loading platforms, ship decks, container yard walkways, resistant to vehicle/container rolling and salt-spray corrosion.
Municipal heavy-duty applications
Heavy vehicle bridges, underpass paving, heavy-duty trench covers, waste transfer station platforms.
Special heavy-duty scenarios
Large equipment base covers, heavy machinery ladder treads, oilfield and wind farm heavy-duty platforms.
Others
Any load-critical areas requiring long-term stable performance under heavy loads.
Welding fixing
Preferred for permanent and extra-heavy-duty installations. Weld frame or mounting lugs to support beams to ensure stability and anti-theft performance.
Mounting clamp fixing
High-strength corrosion-resistant clamps (minimum 4 per panel) enable detachable installation without damaging the zinc coating, convenient for maintenance and replacement.
Insert fixing
Framed I-section grating can be fitted into pre-set channels and bolted, suitable for heavy equipment covers and trench covers.
Regularly remove debris, oil and standing water to avoid mesh blockage, dirt accumulation on flanges and impaired load performance or corrosion protection.
Inspect welds and clamps for looseness, and check I-flat steel for deformation or rust. Reinforce, repair or replace components as needed.
Repair damaged zinc or paint coatings promptly with touch-up paint or zinc-rich coating to maintain anti-corrosion performance.
Avoid overloading to prevent deformation or fracture. Stainless steel models should avoid contact with strong acids and alkalis and only require regular wiping.
Ordinary flat steel grating
Uses plain flat steel with moderate bending strength and limited load capacity, suitable for pedestrian and light equipment use only.
I-section steel grating
Uses I-profile flat steel with superior cross-sectional performance, higher bending and deformation resistance, and much greater load capacity. Ideal for heavy equipment and vehicle rolling, with longer service life and better stability.
Customers may provide detailed drawings, on-site photos, or specify installation environment, load requirements, I-flat steel specifications, mesh spacing, material and surface treatment preferences.
Our professional technical team will conduct load calculation and precise design to deliver customized I-section steel grating that perfectly matches on-site conditions.
Full technical support and after-sales service are provided throughout the project.
