Galvanized Steel Grating — Hot-Dip Galvanized for Corrosion Protection
Hot-dip galvanized (HDG) steel grating is the most widely specified finish in our steel grating range, and for good reason: a properly applied zinc coating typically protects structural steel for decades in normal atmospheric exposure without repainting. For EPC contractors and procurement engineers sourcing flooring, walkways, stair treads, and trench covers for outdoor or corrosive environments, HDG grating offers the best balance of durability, maintenance cost, and availability.
GoGrating fabricates galvanized grating in Anping, Hebei — the wire-mesh and grating manufacturing hub that produces the majority of China's output, with hundreds of fabrication plants and galvanizing lines within a 30 km radius. Every order is custom-made to project specifications under ISO 9001, to YB/T 4001.1 or ANSI/NAAMM MBG 531, with hot-dip galvanizing to ASTM A123. We do not sell from stock; we build to your drawings and quote against your spec.
What is Galvanized Steel Grating?
Galvanized steel grating starts as welded bar grating: load-carrying bearing bars are resistance- or pressure-welded to twisted or round cross bars, then cut, banded, and fitted with any cutouts, toe plates, or fixing clips your drawings call for. Only after fabrication is complete is the entire panel immersed in a bath of molten zinc at roughly 450 °C. The zinc metallurgically bonds with the steel, forming hard zinc-iron alloy layers topped by a pure zinc surface.
Galvanizing after fabrication matters. Welds, sheared edges, and drilled holes are all coated in the same dip, so there are no bare spots where corrosion can start — a key advantage over pre-galvanized sheet or painted grating. The coating also protects sacrificially: if the surface is scratched in handling or installation, the surrounding zinc corrodes preferentially and keeps the exposed steel from rusting. Minor site cuts are simply repaired with zinc-rich touch-up paint per standard practice.
For service conditions beyond what zinc can handle — strong acids, certain chlorides, food-contact areas — we also offer stainless 304/316 grating and a full FRP grating line in molded and pultruded constructions.
Galvanized Specifications
Because grating is a custom-order product, the table below shows the ranges we fabricate rather than fixed SKUs. Bearing bars run from 20 × 3 mm light-duty up to 100 × 9 mm heavy-duty sections, in the common 19-space and 15-space pitch series, with plain or serrated surfaces. Zinc coating thickness follows ASTM A123, which sets the minimum by steel thickness category — for typical bearing bar sections this means roughly 70–100 µm minimum average coating. We do not publish generic load tables; span and loading are engineered per project, so contact us for engineered load tables matched to your bar size and span.
Panels are produced to order — straight runs, cut-to-fit pieces around penetrations, banded ends, kick plates, and matching stair treads with checker-plate or abrasive nosings. Send dimensioned drawings, CAD files (DWG/DXF/STEP), or even a marked-up site sketch and our engineers will return a cutting list and fabrication drawing for approval before production.
Applications for Galvanized Grating
HDG grating is the default specification wherever steel flooring lives outdoors or near water and chemicals. Typical uses include municipal and industrial wastewater treatment walkways and trench covers, chemical and petrochemical plant platforms and pipe-rack flooring, marine and offshore jetties, docks, and shipyard decking, power plants and substations, highway and rail drainage covers, and mezzanine and catwalk flooring in unheated industrial buildings. Serrated bearing bars are recommended for oily, wet, or sloped surfaces. See our applications pages for sector-specific guidance.
We export galvanized grating routinely to the Middle East, Southeast Asia, Europe, Australia, and Latin America, with export-grade steel-strapped bundle packing and documentation for letter-of-credit or inspection-based contracts (SGS/BV third-party inspection welcome). To get started, request a quote with your bar size, pitch, panel schedule or drawings, surface option, and destination port.
| Bearing bar size | 20 × 3 mm to 100 × 9 mm (flat or serrated) |
| Bearing bar pitch | 19-space (≈30 mm) and 15-space (≈40 mm) series; custom pitches on request |
| Cross bar pitch | Typically 50 mm or 100 mm; twisted square or round bar |
| Panel size | Made to order; typical max panel approx. 1,000 × 6,000 mm |
| Base material | Q235 / Q355 carbon steel (S235/S275 equiv.); stainless 304/316 available |
| Zinc coating | Hot-dip galvanized after fabrication per ASTM A123; approx. 70–100 µm min. average by steel thickness |
| Surface options | Hot-dip galvanized, untreated (mill), painted, stainless 304/316 |
| Fabrication | Cutouts, banding, toe plates, stair treads, fixing clips — to drawings |
| Standards | YB/T 4001.1, ANSI/NAAMM MBG 531, ASTM A123, ISO 9001, CE |
| Load data | Engineered per project — contact us for load tables for your span and duty |
- Hot-dip galvanized after fabrication — welds and cut edges fully coated
- Bearing bars 20×3 to 100×9 mm in 19-space and 15-space series
- Plain or serrated anti-slip surface options
- Built to your drawings: cutouts, banding, toe plates, stair treads
- ISO 9001 factory in Anping; YB/T 4001.1 / NAAMM MBG 531 / ASTM A123
- Export-grade packing to Middle East, SE Asia, Europe, Australia, LatAm
Frequently Asked Questions
Is the grating galvanized before or after fabrication?
After. Panels are welded, cut, and banded first, then hot-dip galvanized as finished pieces per ASTM A123, so welds, sheared edges, and holes receive the same zinc coating. This is the key difference from pre-galvanized or painted grating and the reason HDG grating lasts longer in outdoor and wet environments.
Can you produce galvanized grating to our project drawings?
Yes — that is our standard workflow. Send dimensioned drawings or CAD files (DWG/DXF/STEP) with bar size, pitch, panel schedule, and surface option. Our engineers return fabrication drawings and a cutting list for your approval before production, including cutouts, banding, kick plates, and matching stair treads.
What is the MOQ and typical lead time?
There is no fixed MOQ — we quote per project, though small trial orders are usually grouped with standard panel sizes for economical freight. Typical production lead time is two to four weeks after drawing approval, depending on tonnage and fabrication complexity, plus sea freight to your port. Request a quote for a firm schedule.
Which standards does your galvanized grating meet?
Grating is manufactured to YB/T 4001.1 (China) or ANSI/NAAMM MBG 531 (US) as your specification requires, with hot-dip galvanizing per ASTM A123 and production under ISO 9001. CE-marked supply and third-party inspection (SGS/BV) are available. Load capacity is engineered per project — ask for load tables for your span and duty.