Engineered Around Your Load & Span
Galvanized Steel Grating
Galvanized steel grating is carbon steel bar grating that is fully fabricated first — welded, cut and banded — then hot-dip galvanized as a complete panel. Zinc coating per ASTM A123 / ISO 1461 or customer standard, verified by inspection reports, protects welds, cut edges and surfaces for outdoor platforms, walkways, stair treads and trench covers.
- Hot-dip galvanized after fabrication — welds and cut edges fully coated
- Zinc coating per ASTM A123 / ISO 1461 or your project standard
- Coating thickness verified by inspection reports before shipment
- Plain or serrated surface, fabricated to your layout drawings
What is galvanized steel grating?
Galvanized steel grating is welded carbon steel grating protected by a hot-dip zinc coating. Unlike pre-galvanized material, the panel is completely fabricated first — bearing bars welded, panels cut to size, ends banded and cut-outs formed — and only then immersed in molten zinc. Every weld point, cut edge and drilled hole receives the same continuous coating as the flat surfaces.
This fabrication-first sequence is what makes hot-dip galvanized grating the default specification for outdoor industrial platforms, walkways, stair treads and trench covers. Coating thickness is controlled to the agreed standard — typically ASTM A123 or ISO 1461 — and confirmed with coating thickness measurements in the inspection report for each batch.
DONGFU GRATING manufactures galvanized grating to project drawings: bearing bar size and spacing matched to your span and load, serrated bars where slip resistance matters, and panels banded, numbered and export-packed in installation sequence.
Applications
Where Galvanized Steel Grating Is Used
Industrial Platform Grating
Open-grid flooring for chemical plants, equipment platforms and mezzanines — strength, drainage and ventilation in one panel.
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Walkway & Catwalk Grating
Safe, drained, ventilated walkways for photovoltaic arrays, pipe racks, tank farms and roof access routes.
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Trench Covers & Drainage
Drainage covers that keep water moving and traffic safe — from pedestrian channels to truck crossings.
View applicationSpecifications
Specification Options
| Item | Options | Notes |
|---|---|---|
| Material | Carbon steel Q235 / Q355 (≈ A36 / S235JR / S355JR) | Mill test certificates supplied |
| Bearing bar size | 20×3 to 100×10 mm; common 25×3, 30×3, 32×5, 40×5, 50×5 mm | Sized to span and load |
| Bearing bar spacing | 30 / 40 / 60 mm; imperial 19-W-4, 15-W-4 series | 30 mm most common |
| Cross bar spacing | 50 / 100 mm; 2″ / 4″ | Twisted square bar standard |
| Surface type | Plain / serrated | Serrated for wet, oily, snowy or sloped areas |
| Zinc coating | Per ASTM A123 / ISO 1461 or customer standard | Thickness verified by inspection reports |
| Panel size | Up to 6100 × 1000/1200 mm per panel | Larger areas split into numbered panels |
| Fabrication | Banding, cut-outs, toe plates, clips, tread nosing | Detailed from your drawings |
Variants
Recommended Types
Plain surface, hot-dip galvanized
The economical standard for dry or generally clean industrial platforms, walkways and flooring.
Serrated surface, hot-dip galvanized
Serrated bearing bars add slip resistance for outdoor, wet, oily or inclined walking surfaces and stair treads.
Heavy-duty galvanized grating
Larger bearing bars for forklift, truck and equipment loads — always confirmed against span and load before quotation.
Compound galvanized grating
Grating with a checkered plate top where small-object containment or a solid walking surface is required.
Which base steels take zinc well
Galvanizing response begins with the base-steel chemistry, not only the bath cycle. Silicon and phosphorus can change coating growth and appearance, so the mill certificate and any appearance-critical requirement should be reviewed before production. Q235 and Q355 may both be galvanized, but the grade name alone does not predict the final coating.
Thin and heavy parts entering the same zinc bath do not behave identically. Tall, thin bearing bars are more vulnerable to distortion, while heavier frames heat and cool at a different rate. Mixed sections, lifting points and panel orientation therefore need a pre-production review; increasing bar thickness, splitting a panel or using a press-locked construction may be more practical than accepting a high-thin welded panel.
Small openings, closely spaced recesses and enclosed details need clear drainage and vent paths. Otherwise retained zinc can narrow an opening, obstruct a fixing hole or leave heavy local buildup. Complete welding, cut-outs and banding before dipping, and show every critical opening on the approved drawing.
Coating acceptance follows ASTM A123, ISO 1461 or the named customer specification, with the applicable thickness and inspection results recorded rather than advertised as one fixed micrometre value. Stainless steel and aluminum are not substitute base steels for this process; they use their own cleaning, passivation, anodizing or coating routes.
- Confirm the ordered steel grade and mill certificate before assessing coating appearance or reactivity
- Use Q355 only where the structural selection requires it; verify chemistry, section geometry and galvanizing risk separately
- Flag high-thin bars, mixed section thicknesses, closed pockets and critical holes during drawing review
- Record coating inspection against the project standard and batch report, not a universal thickness promise
Fabrication & QC
Fabrication & Quality Notes
- Panels are completely welded, cut and banded before galvanizing so every edge is coated.
- Cut-outs, toe plates, lifting holes and clip positions are fabricated to layout drawings.
- Each panel is checked for bar size and spacing, weld points, flatness and dimensions against the drawing.
- Zinc coating thickness is measured and recorded per batch in the inspection report.
- Tall, thin bearing bars (e.g. 3 mm thick above 50 mm depth) are reviewed for distortion risk before production.
Packaging
Packaging & Delivery
- Panels bundled on steel straps or pallets with edge protection.
- Project panel numbering and packing lists matched to layout drawings.
- Steel frame packing available for irregular or high-value panels.
- Ventilation spacing to reduce wet-storage staining during sea freight.
Gallery
Galvanized Steel Grating in Detail
FAQ
Galvanized Steel Grating FAQs
Do you galvanize before or after fabrication?
What zinc coating thickness can you achieve?
Is galvanized grating suitable for chemical plants?
What is the lead time for galvanized grating?
Can you supply panels numbered to our layout drawings?
Send Your Drawings, Get a Confirmed Specification
Complete inquiries are typically answered within 24 hours during business hours.