Which Stainless Steel Grade Do You Actually Need? 304, 316, 430 Explained

Walk into any commercial kitchen in Australia and you’ll see stainless steel everywhere. Benchtops, sinks, splashbacks, shelving, canopy hoods. But here’s what most people don’t know: not all of it is the same material.

There are dozens of stainless steel grades, each engineered for different conditions. Choosing the wrong one means faster corrosion, hygiene risks, and expensive replacements. Choosing the right one means a surface that outlasts your equipment and still looks sharp after a decade of daily service.

This guide cuts through the noise and tells you exactly which grade you need, and why.

What Actually Makes Stainless Steel “Stainless”?

All stainless steel is an iron alloy. What separates it from regular steel is a minimum chromium content of 10.5%. That chromium reacts with oxygen to form a thin, invisible oxide layer on the surface. That’s your corrosion protection. Damage it or contaminate it and you get rust.

The different grades come down to what else is mixed in: nickel, molybdenum, manganese, carbon. Each combination changes the properties: corrosion resistance, weldability, hardness, formability, and cost.

The three grades you’ll encounter most in commercial fabrication are 304, 316, and 430.

Grade 304: The Commercial Kitchen Standard

Grade 304 is the workhorse of the food service industry. It’s the grade you’ll find in virtually every commercial kitchen benchtop, sink, and shelving unit across Australia, and for good reason.

What’s in it?

• 18% chromium
• 8 to 10.5% nickel

This is why it’s often called 18/8 stainless steel. The 18/10 stainless steel you’ll see on cutlery and cookware is the same family, with slightly more nickel for added lustre.

Why it works in a commercial kitchen

• Non-porous surface that won’t harbour bacteria
• Withstands regular cleaning with commercial-grade chemicals
• Heat resistant for direct contact with commercial equipment
• Can be polished to restore surface if scratched
• Meets Australian food safety standards
• Lifespan of 20+ years in normal commercial conditions

Where it works

Benchtops, sinks, splashbacks, shelving, exhaust canopies, prep tables, commercial kitchen fitouts. Essentially anywhere inside a restaurant, cafe, food truck, hospital kitchen, or food production facility.

Where it falls short

Grade 304 is not the right choice for coastal or marine environments. Salt-laden air and chloride exposure will eventually pit the surface and break down the passive oxide layer. That’s where 316 comes in.

Grade 316: The Marine-Grade Option

Grade 316 is the upgrade from 304 for demanding environments. The critical difference is the addition of molybdenum, typically 2 to 3%.

What’s in it?

• 16 to 18% chromium
• 10 to 14% nickel
• 2 to 3% molybdenum

That molybdenum is what earns it the “marine grade” label. It significantly improves resistance to chloride-induced pitting, which is the main failure mode in coastal and marine environments.

Where you actually need 316

• Coastal installations within a few kilometres of the ocean
• Marine and boating applications
• Outdoor furniture or equipment in high-humidity, salt-air environments
• Food processing involving high concentrations of salt or acidic chemicals
• Pharmaceutical and medical applications requiring maximum corrosion resistance

The honest truth about 316 in commercial kitchens

If your kitchen is in suburban Brisbane, Sydney, or Melbourne, you almost certainly do not need 316. The improvement in corrosion resistance over 304 in a normal kitchen environment is negligible. You’ll pay a premium of roughly 20 to 30% more for the material without any practical benefit.

Where 316 is worth it: if you’re building a kitchen at a beach resort, a waterfront venue, or a food processing facility using aggressive cleaning chemicals regularly.

Grade 430: The Budget Ferritic Option

Grade 430 is a ferritic stainless steel, meaning it contains no nickel. It’s magnetic and significantly less corrosion-resistant than 304 or 316.

What’s in it?

• 16 to 18% chromium
• No nickel

Where it’s appropriate

• Indoor decorative trim and panelling
• Kitchen appliance panels (dishwasher fronts, fridge exteriors)
• Low-contact indoor surfaces not exposed to food, moisture, or chemicals
• Budget-sensitive projects where surface contact is minimal

Where it fails

Grade 430 will corrode in food preparation environments. It should not be used for benchtops, sinks, or any surface that contacts food, water, or cleaning chemicals regularly. The lack of nickel makes it susceptible to pitting and rust in wet conditions. Some suppliers sell 430 at 304 prices. Know what you’re buying.

Side-by-Side Comparison

How to Identify Which Grade You Have

If you’re inheriting an existing kitchen or buying second-hand equipment, knowing what grade you’re working with matters.

• Magnet test: 430 is magnetic. 304 and 316 are typically not. This is a quick way to identify ferritic (430) vs austenitic (304/316) stainless.
• Acid test kits: Chemical test kits can distinguish between 304 and 316 by detecting the presence of molybdenum.
• Mill certificate: Any reputable fabricator should be able to provide a material mill certificate confirming the grade of steel used in your benchtops or fitout.
• Ask your fabricator: If they can’t tell you the grade, that’s a problem.

Does Finish Affect Grade Choice?

No. Finish is separate from grade. Both 304 and 316 can be fabricated in:

• Brushed (satin): The most common finish for commercial benchtops. Hides light scratches and looks clean even in a busy kitchen.
• Mirror polish: High-gloss, reflective. Used for display counters and front-of-house applications. Shows fingerprints more readily.
• Electropolished: Ultra-smooth, low-friction surface often used in pharmaceutical and medical environments.

The finish affects appearance and ease of cleaning, not the steel’s corrosion resistance. That’s determined entirely by the alloy composition.

Frequently Asked Questions

The Bottom Line

For most commercial kitchen projects in Australia, the answer is Grade 304. It’s been the food service industry standard for decades because it handles heat, chemicals, moisture, and daily abuse without failing. You don’t need to pay the premium for 316 unless you’re in a coastal or marine environment, or running a high-intensity food processing operation.

Grade 430 has its place on decorative panels and appliance fronts. It does not belong on a benchtop.

When in doubt, ask for a mill certificate. Any fabricator worth working with can tell you exactly what they’re building with and prove it on paper.