Factory-direct steel gratings & stair treads, shipped worldwide
Heavy Duty Welded Grating
Welded grating made to order. Full specs and drawings on request.
Itemized quote within 24 hours · Free drawing review included
In-house electro-forging line
Bearing bars and cross bars fused under one roof
Certified & tested
Reports on request, MTC with every order
Samples in 5–7 days
Production in 15–25 working days
FOB Tianjin
Mill about 400 km from port, shipped worldwide
Duty × process
Why Heavy Duty and Welded Belong Together
Heavy duty answers how much load; the forming process answers how the panel carries it. The general duty framing lives on our heavy-duty grating page, the bar-construction view on heavy-duty bar grating, and the flooring view on heavy-duty steel floor grating. This page is the intersection: what changes when the panel must take wheels and be welded.
When wheels cross the same joints thousands of times, joint integrity becomes the specification. Here is how the three forming processes behave in that duty — with an honest note on which lines run in our own workshop.
| Dimension | Heavy-Duty Welded | Press-Locked | Swage-Locked |
|---|---|---|---|
| Forming principle | Every bearing-bar / cross-bar intersection resistance-forged under pressure | Cross bars mechanically pressed into notched bearing bars — no welding | Cross bars swaged through pre-punched bearing bars |
| Under cyclic wheel loads | Fused joints stay fused — no clip or press fit to work loose as wheels pass repeatedly | Uniform load spread; best under steady, distributed loads | High transverse stiffness; holds fine bars firmly |
| Bar sections | Bearing bars up to 100×8 mm on the welded line | Flat bar ranges set by the press-lock process | Depends on bar selection and punching |
| Mesh range | 30 / 40 / 60 mm centers | Down to 11 / 11 mm close mesh | Dense patterns; depends on bar selection |
| Typical heavy-duty use | Dock and yard crossings, heavy plant floors, trenches under traffic | Municipal trench, tree pits, facades, fine floors | Architectural and fine-mesh flooring |
| Our lines | In-house — electro-forging line | In-house — press-lock machine | Assessed per project on our press line |
Not sure which process takes your wheel load? Send your drawings — we will spec it inside the 24-hour quote.
How the panel is built
From Heavy Bars to Fused Panels
1 · Bar sections toward 100×8 mm
Heavy duty starts with the bearing bar: our welded line runs from 20×3 mm up to 100×8 mm sections. Depth carries the load, thickness resists the wheel — specify by span and wheel load, not by habit.
2 · Every intersection fused
On the electro-forging line, each bearing-bar and cross-bar crossing is resistance-forged in one pass. The panel leaves as one piece — no clips that can loosen as wheels cross and recross the same joints.
3 · Banded edges, HDG finish
Load-line edges are banded so wheel contact lands on a closed edge, then panels go to a certified galvanizing partner for ASTM A123 / ISO 1461 hot-dip galvanizing — typically 2–3 days, already counted inside your production window.
Why specify welded heavy duty
Why Engineers Specify Welded for Heavy Duty
Nothing to loosen under wheels
Every intersection on a welded steel grating panel is fused, so repeated wheel passes find no clip to rattle and no press fit to relax — the joint you inspect on day one is the joint you have in year ten.
Full welded spec range
Bearing bars from 20×3 mm toward 100×8 mm, spacing at 30 / 40 / 60 mm centers. Full specs and drawings on request — the size is matched to your span and wheel load, never padded.
Factory made, tested, any quantity
Custom sizes from the mill that fuses the joints, samples in 5–7 working days, ASTM A123 / ISO 1461 galvanizing optional. Certified & tested, reports on request — small trial orders welcome.
Applications
Where Heavy Duty Welded Grating Earns Its Keep
Wherever wheels meet an open steel floor, fused joints and deep bearing bars are the combination that holds up — qualitatively, this is the panel class for repeated crossings, not just standing weight.
Docks & freight yards
Forklift and truck crossings where the same joints are loaded thousands of times a week.
Heavy plant flooring
Mill and power-plant floors around equipment, drains and wash-down zones.
Trench covers under traffic
Roadside and apron trenches where vehicle wheels cross the panel edge, not just the span.
Heavy platforms & access
Mezzanines and equipment access floors carrying pallets, tools and maintenance traffic.
Specifications
Heavy Duty Welded Grating Specifications
| Parameter | Range |
|---|---|
| Bearing bar | 20×3 mm to 100×8 mm — heavy duty toward the top of the range |
| Bar spacing | 30 / 40 / 60 mm centers |
| Cross bar | Twisted square or round, per specification |
| Panel width | Up to 1.25 m |
| Panel length | Up to 6 m |
| Materials | Q235B carbon steel · SS304 / SS316 stainless |
| Surface | Black or hot-dip galvanized (ASTM A123 / ISO 1461) |
| Duty reference | Produced to ANSI/NAAMM MBG 532 heavy-duty practice |
Materials & test documents
Every heat of Q235B, SS304 or SS316 enters production with its mill test certificate verified at goods-in — the first of our five QC stages. Welds get 100% visual inspection plus sampling on the line. Panels leave with documentation, not promises:
- Mill test certificate to EN 10204 Type 3.1
- Factory inspection report with every shipment
- Declaration of Conformity prepared per order destination
Standards & compliance
Produced to Recognized Standards — Documents on Request
ANSI / NAAMM MBG 532
Heavy-duty welded panels produced to the MBG 532 reference practice, with weld inspection built into the five-stage QC plan.
ASTM A123 / ISO 1461 HDG
Galvanized coating thickness checked by sampling on every galvanized batch before heavy panels are released.
CE & SGS tested
Certified & tested, reports on request — we show documents you can verify, not a certificate wall.
Custom made
Heavy Duty Panels, Cut and Banded to Your Drawings
Send your drawing
Panel sizes, spans, wheel or point loads, quantities — or just photos and a sketch. Drawing review is free.
Quote within 24 hours
Itemized, FOB Tianjin as standard — EXW or CIF on request. Small trial orders welcome, any quantity.
Samples in 5–7 days, production in 15–25
Working days after drawing confirmation, hot-dip galvanizing included. Installation drawings and fixing layout ship with the order.
Factory-direct quote
Get a Factory Quote
Send sizes, spans and wheel loads — a factory quote lands within 24 hours. Welded grating, treads and covers too.
- Five-stage QC, from MTC verification at goods-in to final inspection
- DoC, MTC EN 10204 3.1 and inspection report with every order
- Factory audits welcome — see the electro-forging line before you commit
Prefer to talk? WhatsApp us or sales@dtsteelladder.com
Request your quote
Five fields — we do the rest.
FAQ
Frequently Asked Questions
What bar sizes does heavy duty welded grating use?
Bearing bars run from 20×3 mm up to 100×8 mm, with heavy-duty panels sitting toward the top of that range on 30, 40 or 60 mm centers. Panels measure up to 1.25 m wide and 6 m long; anything beyond the standard range is cut and banded to your drawings.
Why choose electro-forged construction for wheel loads?
Every bearing-bar to cross-bar intersection is fused in one pass, so there is no clip or mechanical joint to work loose under repeated wheel passes — load travels through the panel as one piece. Send your span and wheel load and we confirm the bar section inside the 24-hour quote.
What is the lead time and how is heavy duty welded grating shipped?
Samples ship in 5–7 working days and mass production runs 15–25 working days after drawing confirmation, hot-dip galvanizing included. Panels ship worldwide from Tianjin Port — FOB Tianjin as standard, EXW or CIF negotiable, itemized quote on request.
Related pages
Related Specification Pages
Heavy-Duty Grating
The fundamentals view: what changes in bars, spans and wheels when duty goes up.
View page →Heavy-Duty Bar Grating
The bar-construction view — sections, spacing and how the bar carries the load.
View page →Heavy-Duty Steel Floor Grating
The flooring view — heavy-duty panels as working floors and traffic surfaces.
View page →Heavy-Duty Mild Steel Grating
The grade view — Q235B mild steel in heavy-duty welded sections.
View page →Welded Steel Grating
The full welded line — every bar size, from light mesh to 100×8 mm sections.
View page →Electro-Forged Grating
The process behind every fused joint on this page, explained end to end.
View page →