Who is AISI?
The American Iron and Steel Institute (AISI) is a trading association of North American steel manufacturers. Including its predecessors, it is one of the oldest trading associations in the United States, which goes back to 1855.
It took its current form in 1908, with Judge Elbert H. Gary, president of the United States Steel Corporation, as its first chairman. The development was in response to the need for a cooperative body in the iron and steel industry to collect and disseminate statistics and information, conduct surveys, provide a forum for discussing problems and promote the interests of the industry at large.
The logo of the Pittsburgh Steelers and the Chilean football club Huachipato is based on the Steelmark.
Numbering system for stainless steel
AISI has a numbering system for stainless steel where the three digits indicate the different compositions. The 200 and 300 series are generally austenitic stainless steels, while the 400 series are ferritic or martensitic. Some grades have a suffix of one or two letters indicating a particular change in composition. In 1995, AISI transferred future maintenance of the system to the Society of Automotive Engineers.
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The steel industry has its own specific language. This glossary should help to better understand the terminology used...