304 vs. 316 Stainless Steel: Which Grade Should Your Customers Specify?

Both 304 and 316 are workhorse austenitic grades, but they serve different environments. This guide helps distributors advise their customers on the right grade for the application.

The Two Most Common Stainless Grades

304 and 316 stainless steel account for the overwhelming majority of stainless steel tubing consumed in North America. Both are austenitic, non-magnetic (in the annealed condition), and offer excellent corrosion resistance, formability, and weldability. The key difference is molybdenum.

304/304L: The General-Purpose Standard

304 stainless steel contains approximately 18% chromium and 8% nickel. It resists oxidation in most atmospheric environments and stands up well to many chemical media. 304L (the low-carbon variant) improves intergranular corrosion resistance after welding — which is why 304L is preferred for welded fabrication.

Best for: Interior architectural applications, food equipment framing, general industrial fabrication, HVAC supports, furniture, and most indoor environments.

316/316L: The Corrosion-Resistant Upgrade

316 adds 2-3% molybdenum to the 304 composition, significantly improving resistance to chloride pitting and crevice corrosion. This makes 316 the grade of choice whenever the application involves salt air, seawater exposure, chemical processing environments, or coastal installations.

Best for: Marine and coastal railings, outdoor architectural features in salt-air environments, chemical processing equipment framing, water treatment facility structures, and any application with chloride or chemical exposure.

The Cost Consideration

316 typically carries a 50-75% premium over 304 due to the molybdenum content and nickel surcharge. For interior applications with no chemical or chloride exposure, specifying 316 adds cost without adding value. Distributors who help their customers understand this distinction save them money and build trust.

Dual-Certified Material

Most stainless steel tubing produced today is dual-certified to both the standard and low-carbon grades — for example, 304/304L or 316/316L. This means the material meets the chemical composition requirements of both grades, giving end users the benefits of low-carbon performance without requiring a separate inventory line.

What Kingmaker Steel Stocks

We maintain deep inventory of both 304/304L and 316/316L in rounds, squares, and rectangles. Both grades are available for immediate shipment from our Texas, New Jersey, and California warehouse locations.