If you're trying to decide between 304 and 316 stainless steel, the answer usually comes down to two things: where the metal will live, and how much you want to spend. Pick wrong and you either overspend on an alloy you didn't need or watch your project pit and rust in a couple years. Here's how to choose confidently.

The Quick Answer

304 stainless is the workhorse. It handles about 80% of general-purpose jobs — food equipment, indoor railings, kitchen fabrication, architectural trim, brewery tanks, sinks, and most outdoor projects that aren't near saltwater.

316 stainless costs roughly 20–40% more, but it adds molybdenum to the mix, which gives it serious resistance to chlorides. If your project will see saltwater, pool chemicals, de-icing salts, harsh cleaning chemicals, or coastal air, 316 is worth every extra dollar.

If you're still not sure which grade fits your job, give our sales team a call at 503.588.1311 and we'll walk you through it.

What's Actually Different Between 304 and 316

Both grades are austenitic stainless steels — non-magnetic in their annealed state, highly formable, and easy to weld. The difference is in the recipe. Unlike carbon steel grades like A36, A572, 1018, and 4140, stainless gets its corrosion resistance from chromium and nickel content.

304 stainless composition:

18–20% chromium
8–10.5% nickel
Balance iron, with small amounts of carbon and manganese

316 stainless composition:

16–18% chromium
10–14% nickel (more than 304)
2–3% molybdenum (this is the big one)
Balance iron

That molybdenum addition is what makes 316 special. It dramatically improves resistance to pitting and crevice corrosion in chloride environments — the kind of slow, ugly damage that attacks 304 near the ocean, in chemical plants, or anywhere road salt gets thrown around.

Corrosion Resistance: Where 316 Earns Its Price

304 resists most common corrosives just fine. It handles rain, snow, food acids, cleaning chemicals, and general atmospheric exposure without issue. That's why you see it everywhere from restaurant kitchens to commercial handrails.

Where 304 struggles is chlorides. Salt spray, pool chemistry, brine, and coastal fog will eventually cause tiny pits to form on the surface. Once pitting starts, it spreads underneath the passive layer and can ruin the part.

316's molybdenum content stops that process cold. For Oregon buyers, the rule of thumb we give customers is:

Within a mile of the Oregon coast? Use 316.
Handling pool or spa equipment? Use 316.
Food processing with caustic or chlorinated wash-downs? Use 316.
Everything else? 304 is almost always the smart pick.

Cost: How Much More Is 316?

304 and 316 track the nickel market closely, but 316 carries a consistent premium because of the molybdenum content and the higher nickel percentage. Expect to pay 20–40% more for 316 in sheet, plate, bar, pipe, and tube — sometimes more when moly prices spike. Keep in mind that current steel and aluminum tariffs also affect both grades.

For a small project, that premium might be $50 extra. For a large fabrication job, it could be thousands. The good news: if your application doesn't actually need chloride resistance, you're not getting any real performance benefit from paying for 316. Save the money for tooling or labor.

Mechanical Properties: Close, But Not Identical

These two alloys are mechanically similar:

Tensile strength: Both around 75,000–80,000 psi
Yield strength: Both around 30,000–35,000 psi
Elongation: Both excellent (40%+)
Hardness: Both roughly Rockwell B80–B95 annealed

316 has slightly better high-temperature strength, which matters for hot chemical processing or exhaust applications. For structural or architectural work at normal temperatures, you won't notice a mechanical difference. Need help figuring out how much material your project requires? Our steel weight calculation guide covers the formulas for every common shape.

Both grades cut, weld, and bend well. If you need parts cut to size, we can process stainless in-house with laser cutting, plasma cutting, saw cutting, shearing, and forming. If you're unsure which cutting method fits your job, our guide to steel cutting methods compared breaks down the trade-offs.

Common Oregon Applications

Here's how we typically see Oregon customers spec these grades:

304 stainless is the right call for:

Brewery and distillery tanks, piping, and fittings
Food trucks and commercial kitchen equipment
Interior architectural railings, trim, and panels
Dairy and cheese processing equipment
General fabrication for indoor or inland outdoor use
Trailer components away from de-icing salt

316 stainless is worth the upgrade for:

Marine hardware, boat parts, and dock fasteners on the Oregon coast
Shellfish and seafood processing equipment
Wastewater and chemical handling systems
Pool and spa components
Pharmaceutical and lab equipment
Outdoor structures in Astoria, Newport, Coos Bay, or anywhere with constant salt air

How to Choose: A Simple Decision Framework

When a customer calls us unsure which grade to order, we walk them through four questions:

Will this part ever touch saltwater, salt air, or de-icing salt? If yes → 316.
Will it contact harsh chemicals, chlorinated cleaners, or acids stronger than food-grade? If yes → 316.
Is the expected service life more than 20 years in an outdoor or wet environment? Lean toward 316 for long-term peace of mind.
None of the above? Go with 304 and put the savings toward better fabrication.

Why Buy Stainless from Ram Steelco

We've been supplying metal to Portland and the rest of Oregon since 1938. When you order stainless from us, you get:

Both 304 and 316 in stock — sheet, plate, bar, angle, tube, and pipe
In-house processing — cut, sheared, formed, or machined to your spec
Free next-day delivery across Oregon, including coastal runs (see our delivery page for details)
Straight answers from a team that's been helping contractors, fabricators, and builders specify metal for decades
Local inventory — no waiting on out-of-state shipments

Ready to Order?

If you already know what you need, request a quote online and we'll get you pricing fast. Not sure what details to include? Our guide on how to request a steel quote will save you time. If you're still weighing 304 vs 316 for your specific project, call our sales team at 503.588.1311 or contact us — we'll help you spec the right grade the first time.

Ram Steelco has been Oregon's trusted steel and metals supplier since 1938, offering carbon steel, stainless steel, aluminum, and galvanized products with full in-house processing and free next-day delivery.