AISI 316 (Stainless Steel)

AISI 316 is a high-grade austenitic stainless steel containing chromium, nickel and molybdenum, designed for use in aggressive and humid environments. The presence of molybdenum significantly increases corrosion resistance, particularly on contact with chemically treated water, chlorine or a saline environment. In the wellness sector, it is used to manufacture jets, structural elements, fasteners and internal components of hot tubs or cooling tubs. The material forms a passive protective layer on its surface, which prevents oxidation and degradation. As a result, it retains its mechanical strength and appearance during long-term operation. AISI 316 is the standard in professional and premium applications, where high resistance and a long service life are required.

Advantages of AISI 316 stainless steel

• High resistance to corrosion and chemicals: Withstands chlorine, ozone and salt water without rusting or surface damage.
• Long component service life: A significantly lower risk of degradation means fewer part replacements and lower servicing costs.
• Appearance retained over years of use: The material does not change colour, does not rust, and keeps its original appearance.
• High mechanical strength and reliability: Withstands mechanical wear and long-term contact with water and temperature changes.

AISI 304 and AISI 316: a comparison of stainless steels

Both are austenitic stainless steels and cannot be told apart by eye. The difference is in the composition: AISI 316 additionally contains molybdenum, which increases resistance to chlorides. Chlorides are precisely what attacks the surface of the steel in pool and hot tub water.

The practical consequence is simple: the longer a part stays in contact with treated water, the sooner it pays to reach for 316. For components that the water only reaches occasionally, AISI 304 is usually sufficient and the cheaper choice.

Related terms: AISI 304, Incoloy® 800/825, Marine Grade Vinyl, Gelcoat.