AISI

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 American Iron and Steel Institute:

These specify the material by its Chemical and Physical properties.
When specific model of manufacture of the element is not to be specified, then the material can be identified by ANSI Standards.
The most commonly used AISI specifications are :
AISI 410 - 13% Chromium Alloy Steel
AISI 304 - 18/8 Austenitic Stainless Steel
AISI 316 - 18/8/3 Austenitic Stainless Steel

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