Welded Steel Grating — The Industry Standard for Heavy Loads
Of all the steel grating types specified on industrial projects, welded bar grating is by far the most common. Its one-piece welded construction handles pedestrian and vehicular loads, drains liquids and debris through its open grid, and tolerates decades of outdoor exposure when hot-dip galvanized — which is why EPC contractors and procurement engineers default to it for platforms, walkways, and trench covers.
GoGrating fabricates welded grating factory-direct in Anping, Hebei — the wire-mesh and grating capital of China, where 800+ fabrication plants within 30 km produce over 70% of the country's output. Every order is made to project specification rather than pulled from stock, so panels arrive cut, banded, and finished to your drawings.
What is Welded Steel Grating?
Welded steel grating consists of two elements: bearing bars — the parallel flat bars that carry the load — and cross bars, typically twisted square rods set perpendicular to them. In production, the cross bars are forge-welded into the bearing bars by electric resistance welding: high current and hydraulic pressure fuse the two at every intersection, with no filler metal, rivets, or mechanical locks.
The result is a homogeneous panel in which every joint is a fused connection. Unlike press-locked or riveted grating, there are no separate fasteners to loosen under vibration, which is why welded construction dominates heavy-duty industrial service.
Welded Steel Grating Specifications
Because welded grating is a custom-order product, specifications are defined per project rather than per SKU. Bearing bars range from 20×3 mm up to 100×9 mm; taller, thicker bars span longer distances and carry heavier loads. Bar spacing follows the 19-space (≈30 mm) and 15-space (≈24 mm) series of ANSI/NAAMM MBG 531, or the metric 30/40 mm pitches of YB/T 4001.1, with cross bars at 50 or 100 mm centers. Serrated bearing bars are available where extra slip resistance is required.
Material options are carbon steel (Q235/A36) or stainless 304/316, with surface finishes of hot-dip galvanizing to ASTM A123, untreated mill finish, or paint. Panels are produced up to roughly 1,000 × 6,000 mm and then cut, notched, and banded to your layout drawings. We do not publish generic load ratings — span, spacing, and bar size interact — so request a quote with your loading conditions and we will return engineered load tables referenced to MBG 531.
Common Applications for Welded Grating
Welded grating is the default flooring and drainage product across heavy industry: industrial platforms and mezzanines in petrochemical, power, and mining plants; walkways and catwalks on pipe racks, tank farms, and conveyor lines; stair treads with checkered-plate nosing; and trench and drainage covers in plants, ports, and municipal works.
GoGrating ships these packages to EPC contractors, importers, and distributors across the Middle East, Southeast Asia, Europe, Australia, and Latin America. See our applications guide for sector-specific selection notes, including when a corrosion-driven project is better served by FRP grating instead of steel.
Advantages of Welded Construction
High strength-to-weight ratio. Fused joints let relatively light panels carry heavy concentrated and uniform loads, reducing supporting steel and freight cost per square meter. Durability. With no mechanical fasteners to work loose, welded grating withstands vibration, impact, and thermal cycling; hot-dip galvanizing to ASTM A123 adds long-term corrosion protection in outdoor and coastal service.
Self-cleaning and low maintenance. The open area — typically the majority of the panel surface — lets water, dust, snow, and spills fall through rather than accumulate, keeping walking surfaces safer and inspection-free for years. For most industrial flooring budgets, welded grating delivers the lowest lifetime cost of any walkway surface. Send us your drawings or CAD files via our request-a-quote page and our engineers will confirm bar sizes, finishes, and panel layout for your project.
| Bearing bar size | 20×3 mm to 100×9 mm (height × thickness) |
| Bearing bar pitch | 19-space (≈30 mm), 15-space (≈24 mm); metric 30/40 mm series |
| Cross bar pitch | 50 mm or 100 mm (2 in. / 4 in.), twisted square or plain round |
| Material | Carbon steel Q235/A36; stainless steel 304/316 |
| Surface treatment | Hot-dip galvanized (ASTM A123), untreated, painted, stainless |
| Panel size | Typically up to 1,000 × 6,000 mm; cut and banded to order |
| Bar type | Plain or serrated bearing bars |
| Standards | YB/T 4001.1, ANSI/NAAMM MBG 531; ISO 9001, CE |
- Bearing bars 20×3 mm to 100×9 mm, made to project spec
- Resistance-welded joints — no rivets, no loose connections
- 19-space and 15-space series per ANSI/NAAMM MBG 531
- Hot-dip galvanized, untreated, painted, or stainless 304/316
- Fabricated to YB/T 4001.1 and NAAMM MBG 531 under ISO 9001
- Cut-outs, banding, and toe plates per your CAD drawings
Frequently Asked Questions
Can welded steel grating be fabricated to our project drawings?
Yes — custom fabrication is our standard mode, not an exception. Send DWG/DXF/PDF drawings with your quote request and we fabricate panels with cut-outs, banding, toe plates, and stair treads to layout. If you only have span and loading data, our engineers will propose bar sizes per ANSI/NAAMM MBG 531 or YB/T 4001.1.
What is the minimum order quantity for welded grating?
There is no fixed catalog MOQ because every order is produced to spec, but export economics favor at least a part-container load. Smaller trial orders can often be consolidated with other shipments — tell us your destination port and required quantity and we will confirm feasibility in the quotation.
What is the typical production lead time?
Lead time depends on panel quantity, fabrication complexity, and surface treatment — hot-dip galvanizing adds a processing step. Most project orders ship within a few weeks of drawing approval. We confirm a firm production and delivery schedule with every quotation, so include your project deadline in your request.
Which standards does GoGrating welded grating comply with?
We fabricate to YB/T 4001.1 (China) and ANSI/NAAMM MBG 531 (US), with hot-dip galvanizing per ASTM A123, under an ISO 9001 quality system with CE marking available. Engineered load tables referenced to these standards are provided with quotations rather than as generic published figures.