304 vs 316 Stainless Steel Mesh
Last reviewed on October 3, 2026
Nearly all stainless steel wire mesh is woven or welded from one of two austenitic grades: 304 (the general-purpose "18-8" grade) or 316 (the molybdenum-bearing grade often called "marine grade"). Both are corrosion resistant, food-safe in normal use and easy to form. The difference that matters for mesh is how they cope with chlorides — salt, brine, pool chemicals and some cleaning agents.
Quick Answer
| Situation | Usual Choice | Why |
|---|---|---|
| Indoors, dry or occasionally wet | 304 | Ample corrosion resistance at lower cost |
| Outdoors, inland, ordinary rain | 304 | Performs well where chloride deposits are washed off by rain |
| Coastal, salt spray, road de-icing salt | 316 | Molybdenum improves resistance to chloride pitting and tea staining |
| Pool and spa enclosures | 316 | Chlorinated, warm, humid air is aggressive to 304 |
| Food, brewing and drinking water | 304 (316 for salty or acidic products) | Both are widely used for food contact |
| Welded or sintered assemblies | 304L / 316L | Low carbon limits sensitisation at welds |
Chemical Composition
Typical composition limits (weight %) for the common grades, per the UNS designations used in ASTM product standards. Exact limits differ slightly between product forms (sheet, bar, wire), so check the standard named on your mill certificate.
| Grade (UNS / EN) | Carbon max | Chromium | Nickel | Molybdenum |
|---|---|---|---|---|
| 304 (S30400 / ≈1.4301) | 0.08 | 18.0–20.0 | 8.0–10.5 | — |
| 304L (S30403 / ≈1.4307) | 0.03 | 18.0–20.0 | 8.0–12.0 | — |
| 316 (S31600 / ≈1.4401) | 0.08 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 316L (S31603 / ≈1.4404) | 0.03 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
The EN numbers are the closest European equivalents, not exact matches.
Corrosion Resistance
Stainless steel resists corrosion because chromium forms a thin, self-repairing oxide film on the surface. Chloride ions can break that film locally, causing pitting (small deep pits) and crevice corrosion (under deposits, washers, clamps or where mesh wires cross). Molybdenum in 316 strengthens the film against chlorides, which is why 316 is preferred near the sea and in chlorinated or salty environments.
A common way to compare grades is the Pitting Resistance Equivalent Number, PREN = %Cr + 3.3 × %Mo + 16 × %N. Using the composition ranges above, 304 typically comes out at roughly 18–21 and 316 at roughly 23–28: a meaningful but not unlimited improvement. In warm seawater immersion even 316 can pit, and higher-alloy grades (duplex or super-austenitic) are used instead.
Mesh is especially sensitive because fine wires have a large surface area relative to their cross-section — a pit that would be cosmetic on a thick plate can perforate a 0.1 mm wire. That is why filter cloth for chloride-bearing liquids is usually 316 or 316L.
Strength and Temperature
In the annealed condition 304 and 316 have very similar minimum mechanical properties (ASTM A240 lists 515 MPa tensile and 205 MPa yield for both). Wire used for mesh is usually stronger than these minimums because of cold drawing, and the actual strength of a mesh depends far more on wire diameter and weave than on the choice between 304 and 316.
Both grades are used for heat-exposed mesh such as grill and fireplace screens. Published oxidation-resistance guidance from stainless producers puts their scaling limit at roughly 870 °C for intermittent and 925 °C for continuous service in air. Strength falls well before those temperatures, and prolonged exposure in roughly the 425–860 °C range can sensitise standard-carbon grades (reducing corrosion resistance), so high-temperature structural or furnace applications should use data for the specific grade — heat-resisting grades such as 310 exist for this purpose.
Magnetism
Annealed 304 and 316 are austenitic and essentially non-magnetic. Drawing wire and weaving cloth cold-works the steel, which can make 304 noticeably magnetic and 316 slightly so. A magnet test therefore cannot confirm the grade. To verify grade, ask for a mill test certificate or have the material checked with a handheld XRF analyser; a molybdenum spot-test kit can distinguish 316 from 304.
316Ti, 316L and Other Variants
- 316L / 304L: low-carbon versions for welding, sintering and other heat exposure, preferred for welded panels and sintered filter elements.
- 316Ti (EN 1.4571): titanium-stabilised 316, common in European specifications; the titanium ties up carbon to resist sensitisation at elevated temperature. Corrosion behaviour is broadly similar to 316/316L.
- 430: a ferritic, magnetic grade with lower corrosion resistance; occasionally used where magnetism is needed.
- 201/202: lower-nickel austenitic grades sometimes offered as "stainless" mesh at low prices. Their corrosion resistance is lower than 304's — check the grade before buying.
Cost
316 costs more than 304 because it contains molybdenum and more nickel, and the gap moves with alloy surcharges. For small mesh orders the difference may be modest compared with cutting and shipping; for large orders get both grades quoted.
Frequently Asked Questions
Is 316 stainless mesh worth the extra cost?
Where the mesh sees salt spray, pool or spa water, de-icing salts, brines or acidic process liquids, usually yes: the molybdenum in 316 gives markedly better resistance to pitting and crevice corrosion from chlorides. Indoors, inland outdoors and for most food and water duties, 304 performs well and costs less.
Is stainless steel mesh magnetic?
Annealed 304 and 316 are essentially non-magnetic, but cold work from wire drawing and weaving can make them slightly magnetic, 304 more than 316. A weak pull from a magnet does not prove the mesh is not stainless, and a magnet cannot tell 304 from 316.
What is the difference between 316 and 316L mesh?
316L has a lower carbon limit (0.03% maximum versus 0.08%). Lower carbon reduces the risk of sensitisation, a loss of corrosion resistance next to welds, so 316L is preferred for welded or sintered mesh assemblies.