Duplex Stainless Steel Cladding
For Highly Corrosive Environments
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Overview
Abstract
It was a challenging design problem: supply a sustainable material for roofing, soffit and fascia panels that would perform in close proximity to the Persian Gulf in Doha, Qatar. Corrosive conditions were among the worst in the world; elevated temperature, high atmospheric salinity, high humidity, low rainfall and sand fines that contained iron particles. High wind ratings called for metal, but high corrosion risk limited the field of material options. Limited titanium availability and certain failure of the typical marine grade of stainless steel (T316) required a creative solution. A newly emerging alloy, ATI 2003 was quickly adapted for use in thin gauge building panel applications. The material was produced with a sophisticated low glare, dirt resistant finish and converted into roofing, soffit and fascia panels for the new Hamad Airport. This material has been installed for more than a decade showing no signs of deterioration.
Authors
Fred Deuschle
Director of Engineering & Quality
Rigidized Metals Corporation
FredDeuschle@rigidized.com
Jim Halliday
Director of Business Development
Rigidized Metals Corporation
jhalliday@rigidized.com
Keywords
Introduction
The roof, which comprised most of the metal cladding volume on the project, required a 200 mph wind uplift rating. Metal was quickly determined to be the most practical way
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Background
First of all, highly corrosive environments cause problems for ordinary metals. The typical galvanized spec in such places is G300 (more than triple the zinc coating weight of typical galvanized)
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Methods
Alloy Investigation
Producer-supplied test data
Evaluation of Contamination
Scanning electron microscope with energy dispersive x-ray analysis
Soil Analysis
Perkin-Elmer Optima 5300, Inductively Coupled Plasma Emission Spectrometry (ICP-AES)
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Explanation
Alloy Selection
In investigating alloy options for the Hamad Airport terminal, durability in a severely corrosive site location was a clear goal, but a holistic solution required the material to be
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Conclusion
Selecting a cladding material for the Hamad Airport terminal in Doha presented significant challenges. The location is highly corrosive. High wind exposure meant metals were most practical, but metals typically
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Rights and Permissions
Climate data: climatedata.org
Oceanic salinity data: US Geological Survey & NASA
ATI 2003 test data: Allegheny Technologies, Inc.
All photographs supplied by Rigidized Metals Corporation