316 stainless is a Cr-Ni-Mo austenitic grade recognized for better chloride, acid, and washdown resistance than 304. The molybdenum addition improves resistance to pitting and crevice corrosion in salt air, road salt, and several chemical environments. 316 forms and welds well, work hardens during bending, and is non-magnetic when annealed (may become slightly magnetic after heavy cold working). Offered in a #2B finish (24 gauge to 1/8″) and a #4 brushed finish (18 gauge to 1/8″) for visible surfaces. Typical uses: marine and coastal hardware, food and pharmaceutical equipment, CIP/washdown enclosures, chemical process parts, architectural trim, guards, flanges, brackets, frames, and plates requiring durable corrosion resistance.
316 stainless (UNS S31600) is an 18-8 with ≈2–3% Mo, offering enhanced resistance to chlorides and several acids. It maintains strength and toughness over a wide temperature range and provides a clean, easy-to-sanitize surface for hygienic environments.
Corrosion Behavior
Chlorides: Better pitting/crevice corrosion resistance than 304 in coastal areas, spray zones, road salt, and many cleaning regimes. Avoid hot, stagnant chloride solutions; design for drainage and drying.
Chemicals: Broad resistance to many organic acids and bases. Check compatibility for strong acids, halides, and reducing environments.
Maintenance: Regular rinsing/cleaning to limit tea staining. Passivation (and electropolishing if needed) to restore and strengthen the protective film after fabrication.
Finishes offered: the #2B (standard rolled finish, pearl-gray) covers the full range from 24 gauge to 1/8″; the #4 brushed (directional satin grain, the commercial-kitchen look) is offered from 18 gauge to 1/8″ for visible surfaces.
Stiffness/strength: Modulus comparable to 304; strength slightly higher after forming due to work hardening.
Welding: TIG/MIG and resistance welding common. For large welds or where post-weld corrosion resistance is critical, use 316L (low carbon) filler/base to limit sensitization.
Galling: Stainless-on-stainless threads can gall. Use compatible anti-seize, apply controlled torque, and consider coated or dissimilar fasteners.
Isolation/contamination: Avoid carbon steel contamination during handling (clamps, tables, dust) to prevent rust staining.
24-20 gauge (0.025″–0.038″): light panels, cladding, splash guards, and hygienic covers. 18-16 gauge (0.050″–0.063″): panels, moldings, small brackets, trays, and marine trim. 14-12 gauge (0.078″–0.109″): enclosures, washdown panels, tank components. 1/8″ (0.125″): structural brackets, heavy-duty guards, and mounting lugs in marine/chemical environments.
Typical Applications: Marine/coastal hardware and panels, food and pharmaceutical equipment (CIP/SIP), chemical process parts, pump/valve components and clamps, architectural accents exposed to salt, high-cleanability guards, and high-reliability brackets/frames in corrosive service.
The Bottom Line: Choose 316 when you need stainless with true chloride resistance—from a light 24-gauge panel to a structural bracket at 1/8″, in an industrial #2B or brushed #4 finish.