Factory-direct steel gratings & stair treads, shipped worldwide
Carbon Steel Bar Grating
Carbon Grating: every batch ships with traceable mill test certificates.
Q235B structural carbon steel · Black or hot-dip galvanized · Itemized quote within 24 hours
Factory-direct, no middlemen
Weld and press lines in-house, one owner from steel to container
Certified & tested
MTC verified at goods-in, reports on request
Samples in 5–7 days
Production in 15–25 working days
FOB Tianjin
Mill ~400 km from port, shipped worldwide
Material comparison
Steel Grating Material Comparison
Four materials, one honest table. This page covers Q235B carbon steel — the structural workhorse grade. The cost column stays qualitative on purpose: real numbers arrive as an itemized quote, FOB Tianjin.
| Material | Corrosion behavior | Typical environment | Relative material cost | Documents & delivery |
|---|---|---|---|---|
| Q235B carbon steel | Needs paint, shelter or a galvanized coating where water stands | Indoor platforms, warehouse floors, panels finished on site | Lowest of the four | MTC per heat; fastest turnaround |
| Q235B + hot-dip galvanized | Zinc coating metallurgically bonded — corrosion-resistant outdoors | Outdoor walkways, trench covers, plant yards | Low to mid | MTC per heat; HDG adds 2–3 days inside the production window |
| SS304 stainless | Corrosion-resistant across most washdown duties | Food plants, dairies, general chemical areas | Higher | MTC per heat; same production window |
| SS316 stainless | Strongest of the four against chlorides | Marine, coastal, heavy chemical exposure | Highest | MTC per heat; same production window |
Still weighing carbon against stainless for a wet line? Send your drawings — we will spec it inside the 24-hour quote, both options priced itemized.
Process compatibility
How Q235B Runs Through Our Lines
1 · Grade and bar selection
Q235B flat bearing bars from 20×3 mm to 100×8 mm, plain or serrated, spaced at 30 / 40 / 60 mm centers. The heat analysis and mechanical values for the exact bars in your order sit on the mill test certificate.
2 · Weld or press-lock
The same Q235B bar runs on both in-house processes — electro-forged welding for open mesh at heavy loads, or press-locking for close mesh down to 11/11 mm. No third-party panel sourcing.
3 · Black or HDG finish
Black panels leave bare or with oil protection for export. Hot-dip galvanizing to ASTM A123 / ISO 1461 runs at a certified partner near our mill — typically 2–3 days, already inside your production window, with coating thickness sampled on every batch.
Why specify carbon steel
Why Buyers Specify Carbon Steel Bar Grating
Traceable per heat
Q235B mill test certificates (EN 10204 Type 3.1) with every shipment — the heat number on your certificate is the heat number on your bars, checked at goods-in before production starts.
Black or galvanized, long life either way
Take carbon steel black for indoor duty, or hot-dip galvanized for weather exposure — a bonded zinc coating plus an open mesh that sheds water and debris is a long-life combination at the lowest material cost of our four lines.
Any size, small MOQ, to your drawings
Cut and banded to your drawings with free review inside the 24-hour quote — 19W4-style designations or fully custom dimensions, trial orders welcome. Other grades quoted to project spec.
Applications
Where Carbon Steel Bar Grating Works
Carbon steel earns its place wherever the structure is dry, coated or sheltered — and where load capacity matters more than corrosion duty.
Industrial platforms & mezzanines
Load-rated Q235B flooring for maintenance decks and plant levels, painted or galvanized to suit.
Warehouse & storage floors
Open mesh over storage levels and pits — light passes through, spills drop through.
Trench & pit covers, dry zones
Covers for indoor trenches and cable pits; pair with HDG when washdown reaches the floor.
Stair treads & landings
Carbon steel treads with serrated or plain surface, banded and ready to bolt.
Grade & specifications
Q235B: What the Grade Means in a Panel
| Parameter | Range |
|---|---|
| Material grade | Q235B structural carbon steel, impact-tested quality grade |
| Bearing bar | 20×3 mm to 100×8 mm, plain or serrated |
| 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 |
| Finishes | Black (bare or oil-protected) or hot-dip galvanized (ASTM A123 / ISO 1461) |
| Certificates | mill test certificates (EN 10204 Type 3.1) with every shipment |
Reading the Q235B designation
The letter Q marks a structural carbon steel specified by yield strength; the 235 is the minimum yield strength, 235 MPa, in the common bar thicknesses grating uses. The B is the quality grade: impact-verified at moderately low temperature, one step above grade A.
Structurally that means a ductile, readily weldable steel — Q235B joins without preheat at grating bar sizes, takes hot-dip galvanizing well, and is the standard structural grade behind our welded and press-locked carbon steel panels. When a drawing simply says "mild steel grating," it usually means this same grade family — we quote it as carbon steel, with the grade stated on the mill certificate.
Specifying in North America? Q235B and ASTM A36 are broadly comparable structural carbon grades — comparable structural carbon grades are available to project spec, so confirm the exact grade in your quote. We never claim a grade certification we have not issued; the mill test certificate lists the actual heat analysis and mechanical values for your verification.
Material proof & standards
Mill Test Certificates (EN 10204 3.1)
You get mill test certificates (EN 10204 Type 3.1) with every shipment, issued per heat of Q235B and verified at our goods-in inspection — stage one of the five-stage QC plan that follows your panels to the container.
MTC per heat, stage one
Every heat of Q235B entering the workshop has its mill test certificate checked at goods-in — heat number, chemical analysis and mechanical values — before a single bar is cut.
HDG checked per batch
Galvanized orders are coated to ASTM A123 / ISO 1461 practice with coating thickness sampled on every batch before release — the fourth of five QC stages.
Certified & tested
Reports on request — a Declaration of Conformity prepared for your destination and a factory inspection report travel with every carbon steel order.
Order documents — DoC, MTC, inspection reports → · Inside the five-stage QC plan →
Custom made
Custom Sizes, Cut and Banded to Your Drawings
Send your drawing
Panel sizes, loads, finish — black or galvanized — and 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, factory-direct with no middlemen.
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 your carbon steel bar grating specs for a factory quote — material certs ready to preview before you commit. Itemized within 24 hours, free drawing review included.
- 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 lines 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 certificates come with a carbon steel bar grating order?
You receive mill test certificates (EN 10204 Type 3.1) with every shipment, issued per heat of Q235B and checked at our goods-in inspection before production starts. A Declaration of Conformity and a factory inspection report travel with the same paperwork.
When does carbon steel beat stainless steel on cost?
In dry, sheltered or indoor service — and outdoors wherever a coating can be maintained — Q235B carbon steel with a hot-dip galvanized finish is usually the lower-cost route to a long service life. Stainless steel earns its higher cost in permanently wet, chemical or marine environments where a coating would not survive.
Which finish should I choose: black or hot-dip galvanized?
Black (uncoated) panels suit indoor use, site painting or immediate fabrication, and can be supplied with oil protection for export. Hot-dip galvanizing to ASTM A123 / ISO 1461 is the default for weather exposure — it adds 2–3 days at our certified galvanizing partner, already inside the 15–25 working-day production window.
Related pages
Related Material Grating Pages
Q235 Steel Grating
The full grade page: designation values, chemistry and the MTC flow.
View page →Structural Steel Grating
Q235B in structural duty, produced to MBG 531 reference practice.
View page →Bar Grating
Bar construction basics: bearing bars, cross bars, 19W4 designations.
View page →Galvanized Bar Grating
The same carbon panel with hot-dip galvanized weather protection.
View page →Black Grating
Uncoated mill finish, HDG on request, oil protection for export.
View page →Stainless Bar Grating
SS304 / SS316 bar grating when the environment demands it.
View page →