Grade 304 is widely used for general commercial-kitchen fabrication, while 316 offers greater resistance in harsher chloride, saline or chemical environments—but grade alone does not guarantee a durable hygienic installation.
Installation boundary: This article explains design and coordination principles. Drainage, ventilation, fire, electrical and fabrication work must be designed and carried out by competent people using current project documents, manufacturer instructions and the requirements that apply in the relevant UK nation.
The short answer
Specify the material from the actual exposure. 304/304L is commonly suitable for general food preparation, worktops and sinks under controlled cleaning. 316/316L may be justified where chloride exposure, saline products, aggressive chemicals or coastal conditions increase pitting risk. Dry non-food-contact panels may use other grades, but they should be explicitly identified. Also specify sheet thickness, finish, weld consumable, post-fabrication cleaning, support and permitted cleaning products.
The environment decides more than the room name
A fish-preparation bench exposed to salt, a chemical-dosing shelf and a dry wall panel are not the same duty even though all sit in one kitchen. Map food acids, brine, salt storage, bleach or hypochlorite use, dishwasher chemicals, heat and standing-water risk. Ask the cleaning supplier for concentrations and contact times; corrosion often follows incorrect chemical use rather than an inherently wrong metal.
Surface finish affects cleanability and corrosion behaviour. A directional brushed finish hides handling marks but deep scratches across the grain can retain soil. Highly rough or poorly ground welds are more difficult to clean. Specify a consistent finish and require weld areas to be restored appropriately rather than left heat-tinted or smeared with carbon-steel contamination.
Thickness and support prevent hygiene failures
Thin sheet over wide unsupported spans can drum, dent and flex at sink bowls. Movement opens sealant joints and traps water around upstands. Heavier gauge is not a substitute for a well-designed frame: specify span, backing, edge folds, sink support and concentrated loads from appliances placed on the top.
Avoid vague orders such as 'food-grade stainless'. Use the relevant EN material designation or an unambiguous equivalent, thickness and finish on the fabrication drawing. Require certificates where the exposure or client specification makes grade critical. Keep dissimilar metals and contaminated tools under control during fabrication and installation.
What common failures reveal
| Site symptom | Likely installation issue | Practical consequence |
|---|---|---|
| Brown staining around weld | Heat tint or carbon-steel contamination not removed | Reduced corrosion resistance and poor appearance |
| Pitting beside salt station | Grade or cleaning regime unsuitable for chloride exposure | Rough surface that is harder to sanitise |
| Top flexes around sink | Sheet and support frame not designed together | Failed seals and standing water |
| Different panels age differently | Unspecified mixed grades or finishes | Uneven corrosion and replacement difficulty |
| Surface scratches during cleaning | Abrasive method used across grain | Soil retention and visual damage |
Installation and coordination checklist
- Map salt, acid, chemical, heat and standing-water exposure.
- Specify grade with an unambiguous material designation.
- State sheet thickness, finish direction and acceptable surface quality.
- Design frames, backing and folds for the real span and load.
- Specify compatible welding consumables and post-weld treatment.
- Prevent carbon-steel tool or grinding contamination.
- Agree permitted cleaning chemicals, concentrations and contact times.
- Request material evidence where grade is safety- or durability-critical.
Commissioning and handover
Give the operator the grade and finish schedule, cleaning instructions and approved chemical information. Photograph and inspect welds, corners and underside supports before equipment blocks access. Keep material certificates and fabrication drawings with the asset records so future repairs use compatible metal and consumables.
Questions to ask before approving the work
- What exposure justifies the selected grade?
- Is thickness supported by a frame and load design?
- How will weld heat tint and contamination be removed?
- Which cleaning chemicals are permitted?
- Can the supplier evidence the material where required?
Capture the installation detail before it becomes a site problem
Plan the full kitchen installation across equipment, utilities, ventilation, safety, hygiene and handover.
Technical sources and further reading
- worldstainless: Food and beverage industry
- worldstainless: Practical Guidelines for the Fabrication of Austenitic Stainless Steels
- worldstainless: Basic facts about stainless steel
Last technical review: 14 August 2026. Always check the latest manufacturer instructions, statutory guidance, standards and project approvals before installation.