Stainless Steel Grating
AISI 304 and 316L welded and press-locked stainless grating, pickled and passivated — for food processing, pharmaceutical, chemical and marine environments where carbon steel rusts in months.
Get a Quote Download CatalogStandard stainless grating sections & weights
Screenshot-ready. Every dimension below is a standard tooling size — custom spacings are cut to your drawing at no extra mold cost.
| Type | Bearing bar (mm) | Pitch (mm) | Weight (kg/m²) | Typical duty |
|---|---|---|---|---|
| S253/30/100 | 25 × 3 | 30 / 100 | 23.1 | Light pedestrian |
| S323/30/100 | 32 × 3 | 30 / 100 | 27.4 | Walkways, stairs |
| S325/30/100 | 32 × 5 | 30 / 100 | 44.2 | Industrial walkway |
| S403/40/100 | 40 × 3 | 40 / 100 | 25.4 | Platforms |
| S405/40/100 | 40 × 5 | 40 / 100 | 40.9 | Heavy platforms |
| S505/50/100 | 50 × 5 | 50 / 100 | 35.9 | Wheeled loads |
Serrated top available on all sections (+3% weight). Bar thickness 3/4/5 mm; 304 and 316L weight identically.
Choose your construction and material
Each family has its own load table, finish options and lead time.
304 Stainless Grating
General chemical, food and indoor service — the economical grade.
View series → Product Family316L Stainless Grating
2–2.5% Mo for marine, chloride and acid media.
View series → Product FamilyPress-Locked Stainless
Flat bars, flush joints — the architectural choice for visible installations.
View series → Product FamilyFiberglass (FRP) Grating
Where electrolysis or spark risk rules out metal entirely.
View series →Four material systems, one factory
Zinc thickness is measured per ASTM A123 (70–85 µm), salt-spray tested to 1,000 h. Stainless is pickled and passivated; FRP resin is matched to your chemical media.
| Material | Specification | Best For | QC Note |
|---|---|---|---|
| Carbon Steel, Hot-Dip Galvanized | Q235B / A36, zinc 70–85 µm per ASTM A123 | Walkways, platforms, trench covers, stair treads — the default choice | 1,000 h neutral salt-spray test before white rust |
| Stainless Steel 304 / 316L | AISI 304 (indoor / general chemical), 316L (marine / chloride) | Food processing, pharma, offshore, chemical plants | Passivated and pickled finish, 316L for >3% chloride media |
| Aluminum 6061-T6 | Mill or anodized finish, riveted or press-locked construction | Weight-critical platforms, water treatment, architectural meshes | ≈ 1/3 the weight of steel at comparable spans — cannot be hot-dip galvanized |
| FRP / Fiberglass (GRP) | Molded (isophthalic / vinyl ester) or pultruded profiles | Electrolytic areas, sewage plants, coastal platforms | Non-conductive, non-sparking, corrosion-free alternative to metal |
Load & deflection — stainless 304/316L, 30/100 pitch
Values calculated to NAAMM MBG 531 with deflection limited to L/200. Need a stamped calculation sheet for your span? Ask in the quote form.
| Bearing bar (mm) | U-load @1m (kN/m²) | C-load @1m (kN) | Max span @ 3.0 kN/m² |
|---|---|---|---|
| 25×3 | 6.8 | 3.2 | 0.95 m |
| 32×3 | 11.4 | 5.3 | 1.20 m |
| 32×5 | 18.9 | 8.8 | 1.35 m |
| 40×5 | 29.6 | 13.7 | 1.55 m |
| 50×5 | 46.4 | 21.5 | 1.95 m |
Stainless is ~5% stronger than carbon steel sections of identical geometry (304 ≈ 205 MPa yield, 316L ≈ 200 MPa).
Stainless grade selection by media
Ambient temperature, continuous exposure. Intermittent splash allows roughly one grade lower.
| Medium | Concentration | 304 | 316L | Notes |
|---|---|---|---|---|
| Atmosphere — inland | — | A | A | Either grade; 304 cheaper |
| Atmosphere — coastal / de-icing salt | — | C | A | 316L within 1 km of shoreline |
| Chloride solutions (NaCl / brine) | ≤ 3% | C | A | Above 3% chloride → 316L minimum; consider FRP |
| Chlorinated washdown (bleach CIP) | ≤ 200 ppm | C | B | Rinse after cycle; FRP often better |
| Sulfuric acid | ≤ 10% | B | A | Above 10% or >40 °C → FRP vinyl ester |
| Nitric acid | ≤ 30% | A | B | 304 is actually the better grade for nitric |
| Acetic / organic acids | ≤ 50% | B | A | Food and brewing service |
| H₂S biogas zones (sewage screens) | — | C | B | Inspect annually; FRP alternative |
A = resistant · B = usable with periodic inspection · C = not recommended. Data compiled from Outokumpu and Atlas Steel corrosion tables as a design aid — confirm against your process conditions.
Where stainless steel grating works hardest
Reference projects available per industry on request.
Food & beverage processing
316L floors over CIP zones; passivated, crevice-free welds for washdown.
Pharmaceutical clean areas
Smooth press-locked panels, electropolished on request.
Ports, offshore & ships
316L with chloride resistance ≥ 1,000 h salt spray.
Chemical & refinery plants
Acid-proof grade selection per media concentration table.
Wastewater treatment
Channel covers and screening platforms above H₂S zones.
Public & architectural
Visible flush-joint gratings, ADA-adjacent pitch options.
Send a drawing, receive a finished panel
Upload DXF or DWG with your RFQ — we return a dimensioned shop drawing for approval within 24 hours. No approval, no production.
In-house fabrication
- Cut-to-size from DXF / DWG drawings — band saw and plasma, ±2 mm tolerance
- Notching and cutouts for pipes, cable trays and manholes in any shape
- Banding (closed ends) in flat bar or checkered plate, toe plates to EN ISO 14122-3
- Curved and radial panels for tanks, towers and architectural projects
- Stair tread fabrication with welded or bolted carriers, nosing options
- Pre-assembly of clips, anchors and support steel into kit form for site speed
Everything is auditable
Third-party inspection (SGS/BV/TÜV) welcome at any stage. MTC per EN 10204 3.1 ships with every order by default.
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ASTM A36 — carbon structural steel bar and plate
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ASTM A123 — hot-dip galvanizing, 70–85 µm zinc coating on bearing bars
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ASTM A1011 / Q235B — flat bar feedstock with mill certificates
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NAAMM MBG 531 — load & deflection tables (uniform + concentrated load, L/200)
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EN 1090-1/-2 — structural steel execution, CE-marked assemblies
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ISO 9001:2015 — quality management system, audited annually
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MTC (EN 10204 3.1) material test certificate with every shipment
Ordering terms at a glance
1 pallet (approx. 20 m²) for stock sizes; custom sizes from 100 m²
15–25 days after drawing confirmation
20GP ≈ 26–28 t · 40HQ ≈ 26 t (varies with panel size)
FOB Shanghai / Ningbo · CIF & DDP available on request
T/T 30% deposit, L/C at sight for orders over USD 50,000
Stainless steel grating is the only flooring that survives washdown chemicals, coastal salt air and food-plant hygiene rules without a coating to maintain. This page gives you what most catalogs skip: an honest 304 vs 316L resistance matrix, the chloride thresholds that decide the grade, and load tables for the exact section you need.
All panels ship with an EN 10204 3.1 certificate listing heat number, chemical composition and mechanical properties — including Mo content for 316L orders.
304 vs 316L: the decision table
304 (18% Cr / 8% Ni) handles most indoor and mild chemical service. 316L adds 2.0–2.5% molybdenum, which raises the pitting resistance equivalent (PREN) from ~19 to ~25 — that difference decides whether your grating survives a chloride-rich washdown or pits within a year.
- Use 304 for: indoor food processing (non-chlorinated wash), dairies, general chemical plants, architectural interiors.
- Use 316L for: coastal and marine structures, salt-brine zones, pools and aquaculture, bleach/chloride CIP cycles, offshore platforms, paper mills.
- 316L not 316: the low-carbon “L” variant welds without sensitization — welded grating must be L-grade.
Chemical & chloride resistance matrix
The page-specific matrix below is our starting point for grade selection; final confirmation for aggressive media (e.g. >5% H₂SO₄ hot) is done with your temperature and concentration data. FRP with vinyl-ester resin is often the better answer above 60 °C in acids.
Fabrication & finish
Welding uses matching 308L/316L filler with argon back-purging; all welds are descaled and the complete panel is pickled and passivated in a nitric-hydrofluoric bath — restoring the chromium oxide layer that cutting and welding destroy. Electropolishing to Ra ≤ 0.8 µm is available for pharma and food interiors.
Frequently asked questions
304 or 316L — which do I need?
Why “L” grade — is regular 316 okay?
Is stainless grating stronger than galvanized?
How long does 316L last in salt air?
Can you supply serrated stainless treads?
What surface finishes are available?
Do you offer MTCs for each heat?
Related products & guides
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