Argentum Solutions, Inc.
Sterling guidance on corrosion and materials degradation
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| Intelligent Tools |
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| Corrosion Calculator |
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| Corrosion Economics Estimator |
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David C. Silverman |
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Alloys can be classified in many ways. Categories include composition, manufacturing method, finishing method, product form, heat treatment, and strength level. These categories give rise to alternative classification numbering systems. Alloys in one system can cross boundaries in another system. Providing information on all such classification systems in beyond the scope of this tutorial. The goal of this tutorial is to provide a first pass overview of the commonly used composition-based system used for several common metals and alloys. Information is provided on broad composition ranges and where applicable on heat treatment and machinability characteristics. The alloy families are:
Though UNS numbers are referred to throughout the tutorial, many of numbering references are with respect to other classification systems sometimes more commonly encountered in practice. The SAE (Society of Automotive Engineers) and AISI (American Iron and Steel Institute) system is used for the carbon and low alloy steels. The ASTM (American Society for Testing and Materials) designation is used for cast iron. The Aluminum Association numbering system is used for aluminum alloys. The AISI classification is used for stainless steels and tool steels. As this information is overview in nature, the reader needing more detailed information on classification of these alloys is strongly encouraged to consult the following sources:
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David C. Silverman, Ph.D. - Primary Consultant |