Corrosion Resistance
Grade 304 performs well in internal and low-risk environments. It withstands general moisture and everyday use without issue, making it a reliable choice for many standard applications.
Grade 316 contains molybdenum, which enhances resistance to chlorides, pollutants, and harsh environmental conditions. This makes it particularly suitable for coastal locations, external applications, high-humidity areas, and environments exposed to frequent cleaning chemicals. Note though that even Grade 316 Stainless Steel should not be cleaned with more than a damp cloth or a specific Stainless Steel cleaner, otherwise surface discolouration can occur. Even this grade material is not a guarantee that no corrosion will occur in some harsh environments.
However, where there is any risk of sustained moisture or salt exposure, Grade 316 is typically the more dependable option.
Appearance and Longevity
Both Grade 304 and Grade 316 are available in a range of finishes, including satin and polished stainless steel, with no visible difference at the point of installation.
Over time, however, Grade 304 may develop surface staining or corrosion if used in aggressive or exposed environments. Under the same conditions, Grade 316 is more likely to retain its appearance and finish for longer.
Typical Applications
Grade 304 is generally recommended for:
- Internal doors
- Offices
- Hotels
- Controlled, low-moisture environments
Grade 316 is better suited to:
- External doors
- Exposed hardware
- Coastal or marine environments
- Leisure centres
- Areas subject to frequent chemical cleaning or high humidity
Making the Right Choice
When choosing between Grade 304 and Grade 316, the decision is less about comparing materials and more about selecting the correct grade for the environment. A considered specification helps ensure your ironmongery performs as intended, both functionally and visually, throughout the life of the building.