304 vs 430 Stainless Steel for Commercial Kitchens: The Complete UK Guide (2026)
Almost every quote for commercial kitchen fabrication — sinks, prep tables, wall shelves, cladding, equipment panels — hides one specification that determines whether the metal is still bright in fifteen years or rust-freckled in three: the stainless steel grade. Grade 304 (the “18/8” austenitic grade) and grade 430 (a nickel-free ferritic grade) look identical on delivery day and behave completely differently in service. This guide explains the composition difference in plain trade terms, maps exactly where 430 is an acceptable cost saving and where 304 is non-negotiable, shows you how to read a fabrication datasheet and catch grade substitution, and covers the cleaning chemicals that destroy either grade.
- Grade 304 = roughly 18% chromium, 8% nickel (“18/8”), austenitic structure, essentially non-magnetic. The default food-industry grade for sinks, prep surfaces and wet areas.
- Grade 430 = roughly 17% chromium, no nickel, ferritic structure, strongly magnetic. Cheaper by the tonne, adequate for dry, low-splash duties — panels, legs, cladding, some equipment casings.
- The failure difference is chlorides: salt, brine, chloride sanitisers and bleach cause pitting corrosion far sooner on 430 than 304. Wet, salty, acidic environments are 304 territory, full stop.
- Coastal caveat: salt-laden air accelerates attack on both grades. Within sight of the sea, 304 is the working minimum everywhere; specifiers step up to 316 for extreme exposure.
- Hygiene law doesn’t name a grade: retained Regulation 852/2004 requires food-contact surfaces to be smooth, washable, corrosion-resistant and non-toxic. A pitted, rusting 430 surface stops meeting that test — which is how grade choice becomes an EHO issue.
- The magnet test works here too: 430 grabs a magnet firmly; 304 does not (beyond faint pull on cold-worked edges). A two-second check on any “stainless steel” prep table delivery.
- Price gap at the sharp end: a 2400mm 304-family double sink like the Vogue U910 is £596.21 + VAT; budget 430 lookalikes save perhaps 20–30% up front and typically need replacing in half the time in a wet pot-wash corner.
- Bleach is the great destroyer: hypochlorite attacks the passive layer of both grades. If your sanitiser regime is chlorine-based, rinse thoroughly and never leave it standing on any stainless surface.
Stainless steel is not one material. It is a family of alloys, and the two members that dominate commercial kitchen fabrication sit either side of a real chemical divide. The trade problem is that fabricators and importers rarely volunteer the grade — “stainless steel construction” on a spec sheet can legally mean 430, 201, or worse — and by the time the difference shows, the invoice is three years old. Knowing which grade belongs where is worth thousands of pounds over the life of a kitchen fit-out.
This guide is for trade buyers specifying fabrication and equipment for commercial use: kitchen designers, contract caterers, restaurant and hotel operators, butchers, fishmongers, and anyone signing off a fit-out quote. Browse the Craven Cooling stainless steel fabrication range when ready to specify.
Table of Contents
- Decision 1: Composition — What 304 and 430 Actually Are
- Decision 2: Corrosion — Salt, Acid and Chloride Attack
- Decision 3: Where 430 Is Acceptable, Where 304 Is Essential
- Decision 4: Reading Datasheets and Catching Substitution
- Decision 5: Cleaning Regimes That Protect (or Destroy) Stainless
- Frequently Asked Questions
- Related Buying Guides
Decision 1: Composition — What 304 and 430 Actually Are
Four grades cover almost everything sold into UK commercial kitchens. Learn these and you can read any fabrication quote intelligently.
| Grade | Composition (typical) | Structure | Magnetic? | Relative cost | Kitchen role |
|---|---|---|---|---|---|
| 304 (18/8) | ~18% chromium, ~8% nickel | Austenitic | No (essentially) | Benchmark | Sinks, prep tables, worktops, shelving in wet areas — the food-industry default |
| 316 | ~17% chromium, ~10% nickel, ~2% molybdenum | Austenitic | No | +30–50% over 304 | Extreme chloride exposure — coastal frontline, brine rooms, some fish prep |
| 430 | ~17% chromium, no nickel | Ferritic | Yes — strongly | −20–30% under 304 | Dry, low-splash duty — panels, cladding, legs, undershelves, equipment casings |
| 201 | Lower nickel, manganese-substituted austenitic | Austenitic | No (weakly) | Cheapest “304 lookalike” | Budget import fabrication — corrosion resistance below 304; treat with caution |
Beyond corrosion, the grades handle differently in fabrication. 304 deep-draws and welds cleanly, which is why one-piece pressed sink bowls — no corner seams to harbour bacteria — are almost always 304. 430 is harder to weld without the joint becoming a corrosion site, so budget 430 fabrication tends to be folded and mechanically fastened, leaving crevices. Under retained Regulation 852/2004, food-contact surfaces must be smooth, cleanable and corrosion-resistant; a crevice-seamed, pit-prone surface fails that standard in practice long before it fails structurally.
Decision 2: Corrosion — Salt, Acid and Chloride Attack
The corrosion question is not “does it rust?” but “what does this location throw at the metal, how often, and for how long?” Three attack mechanisms matter in kitchens.
| Attack | Kitchen sources | 304 response | 430 response |
|---|---|---|---|
| Chloride pitting | Salt, brines, chloride sanitisers, bleach residue, softener salt | High resistance; pits only under sustained abuse | Vulnerable — pin-prick pits that deepen and spread |
| Acid attack | Vinegar, citrus, tomato, wine, descalers left standing | Unaffected in normal service; rinse descalers promptly | Surface dulling and etching over time, faster where already pitted |
| Contamination rust | Carbon-steel wire wool, flying grinder sparks, rusty water | Embedded particles rust in place on either grade | Same — plus the base metal joins in sooner |
| Coastal / salt air | Seafront sites, beach kiosks, harbour units | Working minimum; wash down regularly, consider 316 outdoors | Not recommended anywhere salt air reaches |
The pattern to internalise: 430’s weakness is not general decay but localised pitting where chlorides sit wet. A 430 wall panel behind a griddle can outlast the building. A 430 drainer board under a dripping sanitiser bottle will freckle in a year. Salt is everywhere in a kitchen — in food, in dishwasher chemicals, in softener systems — so “wet plus salt” describes most of the business end of the room, and that is exactly the territory the nickel in 304 is bought for.
Decision 3: Where 430 Is Acceptable, Where 304 Is Essential
Grade snobbery wastes money; grade naivety wastes more. The correct fit-out mixes grades deliberately — 304 where the work happens, 430 where the metal just has to stand there looking clean.
304 essential
Wet + salt + food contact- Sinks, drainers, pot-wash
- Prep tables and worktops
- Shelving over wash-down zones
- Meat, fish and veg prep areas
- Anything coastal
430 acceptable
Dry, low-splash duty- Wall cladding away from sinks
- Equipment side panels and casings
- Table legs, braces, undershelves
- Trolley frames in dry stores
- Decorative trim
Judgement calls
Ask about the duty- Splashbacks near (not at) sinks
- Extraction canopy panels
- Shelving in ambient stores
- Servery fascias
- Decide on wetness + chemicals
Chrome wire territory
Dry stores & light duty- Chrome-plated wire racking
- Excellent value in dry stores
- Plating chips = rust in wet/cold rooms
- For coldrooms, specify coated or SS wire
- e.g. Vogue chrome wire shelves below
The economics support mixing. On a fabricated prep table, the worktop is the food-contact, wash-down, EHO-visible surface — that is 304 money well spent. The legs and undershelf see mop splash at worst; 430 there saves real cost with no service-life penalty. Reputable fabricators quote exactly this way (“304 top, 430 frame”) and will say so in writing. A quote that just says “stainless steel” is a quote you should query — and the price will usually tell you the answer before the datasheet does.
Decision 4: Reading Datasheets and Catching Substitution
Grade substitution is rarely fraud — it is usually silence. The spec says “stainless steel”, the buyer assumes 304, the importer supplies 430 or 201, and everyone is technically honest. Here is the goods-in routine that protects you.
Ask the direct question: “What grade is the top, and what grade is the frame?” A reputable supplier answers in one line. Evasion — “food-grade stainless”, “premium stainless” — is your cue to buy elsewhere. Grade belongs on the quote, the order confirmation and the invoice.
A strong whole-surface grab on a claimed-304 worktop means ferritic steel — reject and query. Remember the two caveats: cold-worked edges and pressed corners of genuine 304 can show faint attraction, and cheap 201 passes the magnet test entirely. The magnet catches 430-for-304 swaps; only paperwork catches 201.
Thickness is the other silent downgrade. A quality 304 worktop is typically 1.2–1.5mm sheet on a solid frame; budget imports drop to 0.7–0.9mm, which drums, dents and flexes. Press down hard in the centre of the top — visible deflection under hand pressure tells you the gauge story instantly.
One-piece pressed bowls and polished, continuous welds indicate quality 304 fabrication. Sealant-filled joints, spot-welded seams and raw folded edges are where budget fabrication traps water and soil — and where corrosion and EHO attention both start.
Decision 5: Cleaning Regimes That Protect (or Destroy) Stainless
More stainless steel is killed by cleaning than by cooking. The passive layer needs oxygen and gentle treatment; most damage traces back to three habits.
| Product / habit | Verdict | Notes |
|---|---|---|
| Hot water + neutral detergent + cloth | Correct | The daily default for every grade. Rinse and dry — standing water concentrates minerals and chlorides as it evaporates. |
| Proprietary stainless cleaner / polish | Correct | Weekly, applied along the grain. Restores lustre, leaves a light protective film. |
| Chlorine bleach / hypochlorite sanitiser | Danger | Attacks the passive layer of both grades. If your sanitation regime requires it, dilute correctly, contact-time only, rinse thoroughly, never leave standing overnight. |
| Wire wool / carbon-steel scrapers | Never | Embeds carbon-steel particles that rust in place and scratches across the grain. Use nylon pads; scrub along the polish lines. |
| Acid descalers left standing | Danger | Fine for their job, destructive left overnight. Apply, wait the labelled time, rinse completely. |
Build the regime into the close-down sheet: wash, rinse, dry, and once a week polish along the grain. Train the team that “stainless” is a performance the metal maintains, not a property it owns — the Food Standards Agency expectation of smooth, washable, sound surfaces is met by the maintenance as much as the metal. And keep bleach bottles off stainless shelves: the classic freckle pattern under the chemical store shelf is drip damage, not bad steel.
UK Price Tiers — July 2026
Stainless Fabrication and Shelving We Stock
Three workhorses from the Vogue range that illustrate the grade logic in practice — stainless where it is wet, chrome wire where it is dry. Prices checked July 2026, shown + VAT.
- 1200mm stainless steel wall shelf
- Wipe-clean, wash-down tolerant
- Brackets included for wall fixing
- Frees counter space above prep and wash zones
- 1800mm version (Y753) also stocked at £143.90 + VAT
The right call over sinks, passes and prep benches where chrome wire would corrode and timber is a hygiene non-starter. Fix into solid wall or noggins — a loaded commercial shelf carries real weight.
View 1200mm SS Shelf →- 2400mm double bowl, double drainer
- Stainless steel bowls and work surface
- Full wash-up station in one unit
- Handles hot water, detergent and salt soil all day
- Exactly the duty where grade matters most
The pot-wash corner is the most chemically hostile spot in any kitchen — hot, wet and salty for hours daily. This is where budget-grade fabrication freckles first and where a proper stainless sink unit earns its price over a decade of service.
View 2400mm Double Sink →- 1220 × 610mm wire shelves, 2 pack
- Chrome-plated wire — airflow through the shelf
- Ideal for dry stores and packaging areas
- Keeps stock off the floor for hygiene inspection
- Not for coldrooms or wash-down zones — see note
Chrome wire is the value play where conditions stay dry: strong, breathable and easy to audit. The honest limit: chrome plating is a coating, and in condensing coldrooms or wash-down areas chips become rust points — specify coated or stainless wire there instead.
View Chrome Wire Shelves →Lifetime Cost: 304 vs 430 at the Pot-Wash
The worked example that settles most grade arguments — a wash-up corner in a busy 100-cover kitchen, comparing a proper stainless double sink station against a budget-grade lookalike.
Multiply that logic across every wet-area item in a fit-out and the pattern is consistent: buy the grade the location demands once, or buy the cheap version twice. The reverse also holds — paying 304 prices for dry-store racking and equipment side panels is money the pot-wash corner needed more.
Stainless Steel Care Checklist
Laminate this for the close-down team. It protects both grades and keeps surfaces inside the hygiene standard.
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Daily: wash, rinse, dry Hot water and neutral detergent, rinse off, dry with a clean cloth. Standing water concentrates chlorides as it evaporates — drying is a corrosion control.
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Weekly: polish along the grain Proprietary stainless cleaner applied with the polish lines, never across them. Restores the passive layer’s best surface.
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Never wire wool, never carbon-steel scrapers Embedded carbon particles rust in place and read as “the table is rusting”. Nylon pads only.
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Bleach: contact time, then rinse completely Never leave hypochlorite standing on any stainless surface, and store chemical bottles on a drip tray, not directly on a shelf.
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Rinse descaler splash immediately Descaling the combi or the dishwasher? Wipe any splash off surrounding fabrication before it dries.
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Treat early rust spots, don’t ignore them A fresh freckle usually lifts with stainless cleaner or a paste of bicarbonate. Established pits are permanent — act in week one, not year one.
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Quarterly: inspect welds, seams and shelf brackets Corrosion starts in crevices. Catching a failing seam early is a resealing job; catching it late is a replacement.
Fabrication and Shelving We Stock or Source
| Product | Material / duty | Size | Trade price + VAT |
|---|---|---|---|
| Vogue Stainless Steel Kitchen Shelf Y751 ★ | Stainless — wet areas | 1200mm | £108.80 |
| Vogue Stainless Steel Kitchen Shelf Y753 ★ | Stainless — wet areas | 1800mm | £143.90 |
| Vogue Double Sink w/ Double Drainer U910 ★ | Stainless — pot-wash duty | 2400mm | £596.21 |
| Vogue Chrome Wire Shelves U893 (2 Pack) ★ | Chrome wire — dry stores | 1220 × 610mm | £75.62 |
| Prep tables, custom fabrication, racking systems | Grade to specification | To order | Sourced to spec |
★ = Stocked at Craven Cooling. Custom fabrication and further Vogue lines sourced to specification. Prices July 2026, + VAT.
Related Buying Guides
Planning the wider fit-out? Our guide to choosing commercial shelving covers load ratings, the 150mm-off-floor rule and coldroom-safe finishes. Handling raw meat? Read choosing meat prep equipment for a butchery counter or gastropub kitchen. For taps, dispensers and the wash-down zone itself, see choosing hands-free hygiene equipment. And if you are building a production kitchen from scratch, start with batch cooking equipment for high-volume dark kitchens.
Grade 304 (18% chromium, 8% nickel, austenitic, non-magnetic) is the food-industry default because its nickel-stabilised structure resists the chloride pitting and acid attack that define wet commercial kitchen duty; grade 430 (17% chromium, no nickel, ferritic, magnetic) is a legitimate cost saving for dry, low-splash roles — panels, legs, cladding, casings — but pits and freckles where salt and water sit. Specify 304 for sinks, prep tables, worktops and anything coastal; accept 430 deliberately where the metal stays dry; treat unbranded “stainless steel” on a quote as a question, not an answer, and magnet-check deliveries (strong grab = ferritic, but remember cheap grade 201 passes the magnet test — only written specifications catch it). Chrome-plated wire like the Vogue U893 2 pack (£75.62 + VAT) is excellent dry-store value but wrong for coldrooms and wash-down zones. Cleaning kills more stainless than cooking: no wire wool, no standing bleach, rinse descalers, dry surfaces at close-down. Craven Cooling stocks Vogue stainless shelving (1200mm £108.80, 1800mm £143.90, + VAT), the 2400mm double sink U910 (£596.21 + VAT) and chrome wire shelving, and sources custom fabrication to specification — call 01792 732702 or visit the Swansea showroom.
