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Before selecting architectural metals for any project, it is first necessary to define the environment in which the building will be located. Among the factors that must be considered are:
- Atmospheric contaminants/pollution
- Nearby application of deicing salts
- Airborne abrasives (sand, soil, debris)
- Externally induced fire risk (airborne sparks or brush fires)
- Frequency of maintenance on the part of the owner
As a rule, stainless steel is extremely durable, corrosion resistant and fire resistant. It is available in a variety of grades and finish treatments. When properly specified, fabricated and installed, stainless steel will last indefinitely with little maintenance in all but the most severe environments. If there is any doubt as to the suitability of a given grade of stainless steel in your application, please contact us. In general, the following grades are suitable in the environments as described:
- Type 304 is sufficient for most exterior applications.
- Type 316 should be used within 10 miles of saltwater bodies. However, if the building will be subjected to saltwater spray, a nobler grade of stainless steel or titanium should be specified.
- In close proximity to deicing salt use, even on nearby roadways where vehicle traffic can create airborne particles, Type 316 should be used. If periodic rinsing from rains will not occur on all exterior surfaces, these areas must be washed each spring. If dependable maintenance is not predicted, a nobler grade of stainless steel or titanium should be used.
- Specify Types 304L or 316L if welding will be employed.
- AL 2003TM Lean Duplex is suggested in severe marine environments like the Persian Gulf where greater pitting resistance is required. More can be learned about this alloy on Allegheny Ludlum's website.
- Any grade, including Type 430 may be used in interior applications.
Once a grade has been selected, a finish choice can be made to create the desired visual effect. We recommend the use of uncoated material that will last for many years without degradation. Our Invari products have been designed to provide the flattest, most visually uniform surfaces possible. While there is variability in any manufactured product, even painted panels, our products provide a higher degree of consistency than commonly available metals.
For additional information relating to properties, size ranges, fabrication, installation and maintenance, please refer to the Invari product data sheets that accompany the samples.
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