A SUS304 GN 1/1 pan (0.7 mm) costs USD 3.80–5.50 at factory gate. The same pan in SUS201 costs USD 3.00–4.20 — roughly 15–25% less. The price gap comes from one element: nickel. SUS304 contains 8–10.5% nickel; SUS201 replaces most of it with manganese to cut raw material cost. That substitution changes corrosion behavior, food-safety compliance, and lifespan under commercial kitchen conditions.
This guide is for foodservice equipment distributors, hospitality procurement managers, OEM kitchenware brands, and catering supply importers who need to make an informed material decision when sourcing GN pans at volume.
1. Why Stainless Steel Dominates Commercial GN Pans
GN pans cycle through combi ovens at 260 °C, blast chillers at −30 °C, and steam tables at 80 °C — sometimes within the same service shift. Stainless steel is the only material that survives this full range without cracking, warping, or leaching chemicals into food.
| Material | Temp Range | Impact Resistance | Acid / Salt | Oven / Combi |
|---|
| SUS304 Steel | −40 °C to 300 °C | Excellent | Excellent | Yes |
| Polycarbonate | −40 °C to 99 °C | Good | Moderate | No |
| Melamine | 0 °C to 70 °C | Poor | Poor | No |
| Enamel Steel | −20 °C to 250 °C | Poor (chips) | Good | Yes |
2. 304 vs 201: Chemical Composition and Performance
Both SUS304 and SUS201 are austenitic stainless steels. The difference is in their nickel and manganese content, which directly affects corrosion resistance, food-safety compliance, and weld integrity.
| Element | SUS304 | SUS201 | Why It Matters |
|---|
| Chromium (Cr) | 18–20% | 16–18% | Higher Cr = stronger passive oxide layer = better corrosion resistance |
| Nickel (Ni) | 8–10.5% | 3.5–5.5% | Nickel stabilizes austenite and resists pitting in acidic foods |
| Manganese (Mn) | ≤ 2% | 5.5–7.5% | 201 substitutes Mn for Ni to cut cost; Mn is less effective at corrosion protection |
| Carbon (C) | ≤ 0.08% | ≤ 0.15% | Higher carbon increases intergranular corrosion risk after welding |
| Property | SUS304 | SUS201 |
|---|
| Corrosion Resistance | Withstands acids, salt, repeated steam cycles | Pitting risk with prolonged salt/acid exposure |
| Food Safety Cert | FDA / EU 1935/2004 / LFGB compliant | Passes basic tests; may fail EU Mn migration limits with acidic foods |
| Weldability | Clean welds, low sensitization risk | Higher carbon = weld-zone corrosion risk if not post-treated |
| Magnetic Response | Non-magnetic (slight after cold work) | Slightly magnetic due to higher Mn |
| Unit Cost vs 304 | Baseline | 15–25% lower |
When to choose 201: Dry storage inserts, non-food-contact accessories (pan carriers, trolley shelves), or budget projects where food contact is minimal and short-duration. For anything involving prolonged food contact — especially acidic sauces, marinades, or brine — 304 is the safer investment.
3. Thickness: 0.5 mm vs 0.7 mm vs 1.0 mm
GN pan thickness directly affects durability, heat distribution, and cost. The right choice depends on how the pan will be used.
| Gauge | Weight (GN 1/1, 100mm) | Best For | Durability | Cost Index |
|---|
| 0.5 mm | ~680 g | Cold display, salad bars, single-event catering | Light duty — dents with rough handling | 1.0x |
| 0.7 mm | ~950 g | Steam tables, bain-maries, hotel buffets | Standard commercial — handles daily stacking | 1.3x |
| 1.0 mm | ~1,350 g | Combi ovens, blast chillers, high-volume kitchens | Resists warping under thermal shock | 1.8x |
Mixed-gauge ordering saves budget without sacrificing performance. Specify 1.0 mm for oven and chiller pans (where thermal stress is highest) and 0.7 mm for steam table and holding pans. Ask your supplier whether mixed-gauge runs affect MOQ.
4. Surface Finish Options
Surface finish affects cleanability, corrosion behavior, food release, and stacking performance.
| Finish | Roughness (Ra) | Best Application | Maintenance |
|---|
| Mirror Polish (#8) | Ra ≤ 0.05 um | Front-of-house display, sushi counters, carving stations | Shows fingerprints; needs frequent wiping |
| Satin / Brushed (#4) | Ra 0.2–0.5 um | General kitchen use, steam tables, storage | Hides scratches; easiest to maintain |
| Matte / Mill (#2B) | Ra 0.1–0.5 um | Back-of-house prep, blast chilling, oven use | Most durable; no polishing step = lower cost |
| Edge Type | Description | Cost Impact |
|---|
| Standard Edge | Flat rim; may vacuum-lock when stacked | Baseline |
| Anti-Jam Edge | Recessed rim creates ~3 mm gap for easy separation | +5–8% |
| Reinforced Rim | Rolled or welded edge for heavy loads and dishwasher lines | +10–12% |
5. How to Verify Material Grade When Sourcing
The material grade printed on a quote may not match what arrives at your warehouse. Here is how to verify what you are actually getting.
Step 1 — Request a Mill Test Certificate (MTC 3.1): Issued by the steel mill, traces a specific coil to its chemical composition. Check: Cr ≥ 18.0%, Ni ≥ 8.0% for genuine 304. Ni below 6% is almost certainly 201.
Step 2 — On-site XRF test: Handheld X-ray fluorescence analyzer reads exact alloy composition in seconds. This is the gold standard for field verification.
Step 3 — Molybdenum drop test: Chemical reagent changes color based on Ni content. Dark = low nickel (201), light = high nickel (304). Good for spot checks.
Step 4 — Audit trail: Request steel coil purchase invoices matching the MTC heat number.
Step 5 — Third-party inspection: Engage SGS, Bureau Veritas, or TUV to pull random samples for lab analysis. Include a material substitution penalty clause in your purchase agreement.
6. Food-Safety Certifications by Market
Different export markets have different regulatory frameworks for food-contact metals. Make sure your supplier can provide the right test reports for your target market.
| Market | Standard | Key Tests | 304 vs 201 |
|---|
| USA | FDA 21 CFR 175–178 | Cr, Ni, Mn migration into food simulants | Both pass; 304 with wider margin |
| EU | EU 1935/2004 + CoE metals guide | Cr ≤ 0.01 mg/kg, Ni ≤ 0.14 mg/kg, Mn ≤ 1.8 mg/kg | 201 risks Mn migration failure with acidic foods |
| Germany | LFGB S30–31 | Stricter Ni release limits; organoleptic testing | 304 recommended; 201 often fails |
| France | DGCCRF | French-specific migration testing + labeling | 304 recommended for compliance certainty |
EU compliance note: SUS201 fails manganese migration limits under the Council of Europe resolution with acidic simulants (3% acetic acid, 2 hours at 70 °C) in a significant percentage of lab tests. The 15–25% cost savings of 201 can be wiped out by a single batch rejection at customs.
Frequently Asked Questions
Q: Can I use 201 GN pans for cold food only?
For cold display of non-acidic foods (bread, dry snacks, pre-packaged items), 201 performs adequately — low temperature and neutral pH minimize metal migration. Salad dressings, citrus fruits, and vinegar-based dishes can still trigger corrosion over time.
Q: How do I tell 304 from 201 if the pan is not stamped?
A handheld XRF analyzer gives exact composition in seconds. For a quick field test, a molybdenum drop-test reagent changes color based on nickel content — dark = low nickel (201), light = high nickel (304). Magnet tests alone are unreliable.
Q: Is 0.5 mm thick enough for steam table use?
A 0.5 mm pan handles single-event catering, but it will dent and warp under daily commercial use. For steam tables running 5+ hours daily, 0.7 mm is the minimum practical thickness.
Q: What is anti-jam design, and is it worth the cost?
Anti-jam pans have a recessed bottom rim that prevents vacuum locking when stacked. The 5–8% cost increase pays for itself in labor savings and reduced pan damage in high-volume kitchens.
Q: Does surface finish affect food safety?
Smoother surfaces (#4 satin or mirror) have fewer micro-pits where bacteria can harbor. For HACCP-compliant operations, #4 satin finish is the standard — it balances cleanability with durability and hides minor scratches.
Najor Gastronorm Pans: MOQ 200 pcs, Factory-Direct
Material: SUS304 (18/8) — FDA, LFGB, DGCCRF, CE certified
Range: Full GN sizes (1/1, 1/2, 1/3, 1/4, 1/6, 1/9, 2/1), depths 20–200 mm, perforated and solid
Customization: Thickness (0.5 / 0.7 / 1.0 mm), surface finish (mirror / satin / matte), anti-jam edge, reinforced rim, laser logo engraving
MOQ: 200 pcs (stock gauge) / 1,000 pcs (custom thickness) / 5,000 pcs (OEM)
Lead time: Sample 7 days / Production 25–30 workdays
Capacity: 300,000+ GN pans per month