Hot-dip galvanized steel grating is widely used for its high strength, corrosion resistance and ease of maintenance. The dimensions are designed per GB/T 4001.1-2019.
Application Scenarios of Hot-Dip Galvanized Steel Grating
Hot-dip galvanized steel grating is widely used in various fields due to its high strength, corrosion resistance, and ease of maintenance. The main application scenarios include:
Municipal engineering: road rainwater well covers, drainage ditch covers, bridge sidewalk boards, railings, equipment platforms, inspection walkways and sewage ditch covers.
Industrial fields: petrochemical, power and paper industries - operation platforms, equipment platforms and heavy logistics channels.
Construction: basement drainage ditch covers, construction platforms, steel-structure accessories and exterior wall ventilation openings.
Other: landscape gratings in park squares, vent covers, port platforms and walkways.
Application Scenarios
Core Structure
Bearing flat steel: Series 1 (30 mm pitch, high load - platforms/walkways), Series 2 (40 mm, general purpose), Series 3 (60 mm, light load/ventilation); thickness 2-5 mm, height 20-100 mm, with serrated anti-slip type available. Cross bars: twisted square steel (5x5/6x6/8x8 mm), Series 1 matched with 100 mm pitch, Series 2 with 50 mm pitch. Mesh sizes: 30x100, 40x50, 50x100 mm (large holes for drainage, small holes for anti-fall).
External Dimensions and Model Examples
Length 1-6 m (standard 2/3 m; reinforcing ribs required over 6 m); width 300-1000 mm (commonly 500/600/800 mm); total thickness = flat-steel height + cross-bar diameter. Models: G303/30/100 (30x3 mm flat steel, 30 mm pitch, 100 mm cross-bar pitch) - general platform; G255/30/50 - anti-slip step plate; G403/40/100 - drainage ditch cover.
Weight Calculation (Approximate Method)
Total weight (kg/m2) = (flat-steel weight + cross-bar weight) x zinc-coating factor. Flat steel: width (mm) x thickness (mm) x 0.00785 kg/m, count = 1000/pitch + 1. Cross bar: side (mm)2 x 0.00617 kg/m, count = 1000/pitch. Zinc factor: 1.12 for 30 mm pitch, 1.14 for 40 mm. Example G325/30/100: 32x5x0.00785 = 1.256 kg/m x 34 = 42.704 kg; cross bar 6x6x0.00617 = 0.22212 x 10 = 2.2212 kg; total = (42.704+2.2212) x 1.12 ≈ 50.3 kg/m2. This is an engineering approximation - confirm the exact value with the manufacturer.
Galvanized Steel Grating Weight Calculation
The weight of galvanized steel grating needs to comprehensively consider the weight of bearing flat steel, cross bars, and the increase due to the zinc coating. The core formula is:Total weight (kg/m²) = (Weight of bearing flat steel + Weight of cross bars) × Zinc coating weight increase factor
Weight of bearing flat steel
Weight per single flat steel (kg/m) = Width of flat steel (mm) × Thickness of flat steel (mm) × 0.00785 (steel density)
Total weight of flat steel per square meter = Weight per single flat steel × Number of flat steels per square meter (Number = 1000 ÷ Flat steel pitch + 1)
Weight of cross bars
Weight of twisted square steel cross bar (kg/m) = Side length (mm)² × 0.00617 (square steel density)
Total weight of cross bars per square meter = Weight per single cross bar × Number of cross bars per square meter (Number = 1000 ÷ Cross bar pitch)
Zinc coating weight increase factor
×1.12 for flat steel pitch 30mm, ×1.14 for 40mm (refer to GB/T 13912-2025)
Example: G325/30/100 (32mm × 5mm flat steel, 30mm pitch, 100mm cross bar pitch)
Flat steel: 32×5×0.00785 = 1.256kg/m, Number = 1000÷30+1 ≈ 34, Total weight = 1.256×34 = 42.704kg
Cross bar (6mm square steel): 6×6×0.00617 = 0.22212kg/m, Number = 1000÷100 = 10, Total weight = 0.22212×10 = 2.2212kg
Total weight after galvanizing = (42.704 + 2.2212) × 1.12 ≈ 50.3kg/m²
Installation Notes
Welding fixation: bearing length at both ends ≥25 mm, fillet weld length ≥20 mm, height ≤3 mm; clean slag and apply anti-rust treatment.
Clamp fixation: at least 4 special clamps per plate with anti-loose washers and bolts ≥8 mm.
Decorative grating: fixed with adhesive and nails, or caulked after snap-in installation.
Load spans: 800-1000 mm pedestrian, 1000-1200 mm equipment platforms, 1200-1500 mm heavy-duty; average load ≤2.5 kN/m2; gap between plates ≤15 mm; no overloading; use positioning measures for movable plates.
Corrosive environments: increase zinc coating thickness (≥85 um, per the current GB/T 13912 edition) and keep ≥50 mm between cut edges and weld points to prevent rust.
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FAQs
Q: What materials are commonly used for steel grating?
A: Steel grating is typically made of carbon steel (Q235B) with hot-dip galvanized surface treatment for corrosion resistance. Stainless steel (304/316) and aluminum alloy are also available for high-corrosion environments like chemical plants or coastal areas.
Q: What are the main applications of steel grating?
A: It is widely used as walkways, platform floors, stair treads, drainage covers, trench grates, and safety fences in industrial plants, power plants, sewage treatment facilities, ports, and municipal engineering projects.
Q: What are the advantages of hot-dip galvanized steel grating?
A: Hot-dip galvanized steel grating offers excellent corrosion resistance (service life up to 20+ years outdoors), high structural strength, good ventilation and anti-slip properties, and is easy to install and maintain.
Q: How do I choose the right steel grating specifications?
A: You need to consider load-bearing requirements (pedestrian, vehicle, or heavy equipment), span length, anti-slip needs, and environmental conditions (corrosion level, temperature). Common specifications include 30×3mm or 40×3mm bearing bars with pitches of 30/40/60mm.
Q: Can steel grating be customized for special projects?
A: Yes, most manufacturers provide customized services, including special sizes, shapes, load ratings, surface treatments (galvanized, painted, stainless steel), and designs like serrated anti-slip bars or custom cutouts.