Stainless Steel 316 (18/10)
IN DEPTHAlso: 316 stainless, 18/10 stainless, 316L stainless, marine-grade stainless
Austenitic stainless with ~2% molybdenum that resists chlorides better than 304, suited to coastal, marine, and premium programs.
What sets 316 apart
Stainless steel 316 is an austenitic stainless with a typical composition of roughly 16% chromium, 10% nickel, and 2% molybdenum. Chromium forms the passive oxide layer that resists corrosion, nickel adds toughness and formability, and molybdenum is the element that separates 316 from ordinary 304. Some suppliers label 316 as 18/10, echoing the chromium and nickel figures, but the molybdenum is what actually identifies the alloy.
Molybdenum is what gives 316 its resistance to chlorides. Salt spray, coastal air, and sweat all carry chlorides that can pit 304 stainless over years of use. A drinkware product that cycles between hot and cold, or that lives near salt water, is exactly the kind of product where that extra resistance pays off.
316 vs 304
| Property | 304 | 316 |
|---|---|---|
| Molybdenum | None | ~2% |
| Chloride resistance | Good | Better |
| Relative material cost | Baseline | Typically ~15–25% higher |
| Typical use | General drinkware | Coastal, marine, premium |
316L and welding
316L is the low-carbon variant of 316. Lower carbon reduces carbide precipitation during welding, so 316L welds cleaner and is the usual choice where a component needs a welded seam. For most one-piece drinkware bodies the difference is minor, but it matters on parts with visible or structural welds.
Specifying 316 raises cost and can lengthen lead time, because 316 coil is more expensive and less readily stocked than 304 in some thicknesses. If the target market does not involve chlorides, 304 usually delivers the same day-to-day performance at a lower price.
Practical takeaway: Specify 316 when your market is coastal or marine, or when a premium program justifies a documented corrosion upgrade over standard 304.