304 Stainless Steel: What It Costs, What It's Used For, Where to Order

When most people say "stainless steel," they mean 304. It's the default, the alloy used in commercial kitchens, medical equipment, architectural panels, food processing machinery, and thousands of other everyday applications. If a print calls for stainless without specifying a grade, 304 is almost always the right assumption.

But stainless is a category, not a single material, and different grades behave very differently. Here's a practical guide to what 304 actually is, where it performs well, and how to order it.

What Makes 304 Stainless Different

304 is an austenitic stainless steel, which refers to its crystal structure. The key alloying elements are around 18% chromium and 8 to 10% nickel. This is why you'll also hear it called "18-8 stainless."

The chromium forms a passive oxide layer on the surface that resists rust and corrosion. The nickel adds toughness, ductility, and helps the corrosion resistance hold up under more demanding conditions.

The result is a metal that resists rust in most non-chloride environments, stays clean and hygienic with regular washing, is non-magnetic in the annealed state, and can be welded, formed, and machined without special equipment or exotic tooling.

Where 304 Stainless Is Used

Food Processing and Commercial Kitchens

Countertops, prep tables, sinks, processing tanks, conveyors, and equipment that gets washed with caustic cleaners on a regular basis. The corrosion resistance and cleanability of 304 make it the standard in this industry, and it's FDA-accepted for food contact surfaces.

Medical and Pharmaceutical

Instrument trays, equipment housings, processing vessels, and structural components in environments that need regular sterilization. 304 handles autoclaving and chemical disinfectants well.

Architecture and Construction

Handrails, cladding, decorative panels, and structural fasteners. 304 maintains its appearance outdoors in most climates without rusting or staining.

Chemical Processing

Pipes, tanks, and fittings in mild chemical environments. Worth noting: 304 is not the right choice for chloride-heavy environments. That's where 316 comes in.

General Fabrication

Anything where a part needs to look good, hold up outdoors, and resist corrosion without a coating or plating treatment.

What Does 304 Stainless Cost?

Stainless steel costs more than carbon steel, typically three to five times more per pound for the same shape and size. The main cost driver is nickel, which makes up 8 to 10% of the alloy and tracks commodity markets fairly closely. When nickel prices move, stainless prices follow.

Compared to other stainless grades, 304 is usually the most economical option. 316 typically costs 20 to 40% more because of the added molybdenum content. If you don't need chloride resistance, 304 is the practical choice.

For current pricing on your specific dimensions, the fastest way is to use our catalog. Material costs shift with the market, and live pricing tells you what you'd actually pay today.

304 vs 316: How to Choose

This is the most common stainless decision. The short version is this: use 304 when you need corrosion resistance in normal environments, including food contact, indoor moisture, mild chemicals, and general outdoor use in non-coastal areas. Use 316 when the part will be exposed to chlorides, including saltwater, coastal environments, swimming pools, road salt, or certain chemical processes.

For a full side-by-side breakdown, see our 304 vs 316 stainless comparison.

Machining 304 Stainless

304 is machinable, but it behaves differently from aluminum or mild steel. The main challenge is work hardening. If your cutting tool dwells or runs too slowly, the surface hardens and makes subsequent passes more difficult. The fix is to keep cutting and not let the tool rub rather than cut.

304 also generates significant heat at the cutting zone, so use cutting fluid and make sure chips are evacuating cleanly. Slower surface speeds and higher feeds work better than the aggressive high-speed approach that works on aluminum. Use sharp carbide tooling and plan for more tool wear than you'd see on the same volume of aluminum.

Frequently Asked Questions

Will 304 stainless rust?

In most environments, no. But it's corrosion resistant, not corrosion proof. In chloride-heavy environments like coastal areas or anything with sustained saltwater exposure, pitting corrosion can develop over time. Use 316 for those applications.

Is 304 stainless food safe?

Yes. 304 is FDA-accepted for food contact surfaces and is the standard material in commercial food processing equipment worldwide.

Can you weld 304 stainless?

Yes. Use 308L filler for TIG or MIG welding. Keep heat input controlled to minimize sensitization in the heat-affected zone, which can reduce corrosion resistance at the weld area.

Is 304 stainless magnetic?

In the annealed condition, 304 is largely non-magnetic. Cold working during forming or machining can introduce some magnetism. If non-magnetic properties are critical to your application, verify with your supplier before ordering.